Q?:700r4 in`72 K/20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**special-K** · 04-22-2005, 07:43 AM

My neighbor is parting an`86 K/5 w/700r4.I want to put O/D in my`72 K/2500.What all should I get from this vehicle?It has no engine,otherwise complete.I know my NP205 is hard to beat.So,should I adapt this or is the T-case from the`86 good enough(cheaper route)?This is a Lo-Pro slide-in camper hauler(light)and the most "wheeling" would be on the beach(rarely).

Cethern · 04-23-2005, 09:37 PM

Get the 700r and the wiring harness for the 700r or get one from painless. maybe the crossmember
Then get the spacer to mate the 700r to a 205

In these two pic's you can see the spacer I used in my 83K5 I will use the same thing when I get around to adding OD to my 72 and 71

**special-K** · 04-27-2005, 10:18 PM

Thanks Cethern.Is that Advaced Adaptors?

Rod · 04-27-2005, 11:37 PM

Cethern..was that 700r4 you put in there from a 4x4 to start? Wondering why the spacer?

*72longbed* · 04-28-2005, 08:42 AM

I've been 'bopping' around a couple of websites for a few months now regarding this subject and have learned quite a bit about this conversion so that I can complete it properly for my 71 K20. Here goes:

1. You need to start with a 4WD 700R4.
2. You need an NP205 that was originally mated to a TH350 along with it's factory transfer case adapter.
3. You will need to buy the alluminum 'spacer' from Reds to go between the factory transfer case adapter and the transmission.
4. You will have to cut about 3/16" off the end of the transmission output shaft.
5. If you would like to bolt the transfer case and transmission crossmember to the factory locations, you will be moving your engine cradle and frame mounts about 1 3/4" forward, (not a bad thing at all).
6. You will probably have to have your front driveshaft re-sized to fit.
7. You will now be able to take the Cap off your HEI distributor without large volumes of profanity.

8. You will experience lower RPM at cruise speeds and an awesome 1st gear 'digger'.

Of course you should make sure to have your 700R4 set up properly with a good quality TV cable, and I recommend using a fluid pressure guage to check all of your setting before driving the new setup. Theres other small things that go with converting over to an overdrive tranny, but listed above are the major chores. Not a real big deal if you are fortunate enough to be starting out with a 4WD 700R4. I have a 2WD 700R4 and will have to have a GM 4x4 output shaft installed in it before I can proceed forward with the project.

72longbed

Cethern · 04-29-2005, 12:38 PM

Special-K I got the spacer and the 205 from a CK5 member but I'm pretty sure he got the spacer from A-Red's out of St Louis mo.

Rod
The was a 700r out of my 83 K5 I added the 205 when the 208 went south when the rare drive shaft broke loose and broke the case into a few parts....

72Longbed
I agree with you and would add a tranny cooler

**special-K** · 04-30-2005, 09:22 AM

Hey 72Longbed,thanks.That`s the stuff I was looking for and I have all that,including HEI.That adapter from Red`s is what I wanted to go with.I`ve seen all this before and now it`s all in one place,except Red`s contact info.Anyone?I was considering just using the Blazer`s t-case to be cheap.But,nah,gotta have the 205.I plan on having the 700r purpose-built according to axle/tire/hp/use.Should I just get harness from Painless?Or,use what`s in the Blazer.Is it a stand-alone harness?What other components are involved,ECM?

71swb4x4 · 04-30-2005, 08:57 PM

72 longbed, a couple of comments:
I am pretty sure the 700r4 is 1 3/4" longer than the TH350, before you add that adapter into the picture. So it would be 1 3/4" plus the width of the adapter.
Also - if you are doing #5, you will have no reason to do #6. And if you don't do #5 you will have to shorten the rear drive shaft and lengthen the front drive shaft.

You can do all of this without that aluminum adapter, but it requires the special output shaft from Advance Adapters, which adds some $$ to the whole deal.

*72longbed* · 05-01-2005, 01:05 AM

71swb4x4,
I see that the next step for you is a 700R4. Please keep us all informed as to the method that you undertake to accomplish this. I've only heard bad feedback about the Advance Adapters output shaft and the clearance problems related to it. But hey, you could get lucky and not have a problem.

72longbed

71swb4x4 · 05-01-2005, 08:55 AM

My whole setup was already together once. The transmission case is cracked so I have to rebuild it all, then put it together again.

**Richard** · 05-06-2005, 02:12 AM

Quote:

Originally Posted by 72longbed

I've only heard bad feedback about the Advance Adapters output shaft and the clearance problems related to it.

72longbed

Just interested, what clearance problems? Much stronger route to go than the spacer and the output shaft is not as expensive as averybody makes it sound, I think it is about $125 for it. Just a little more work as the tranny needs to tear down. Also a 2wd tranny will work with the output shaft change as the tailshaft is coming off . Good luck.

**special-K** · 05-06-2005, 07:08 AM

You`re right Richard.I wouldn`t put a trans in a truck w/o a rebuild first.Spend a little extra there and you don`t add that length to the drivetrain.Also,saves cutting tip of input shaft.It`s all a trade-off.

*72longbed* · 05-06-2005, 08:52 AM

As far as clearance problems, I only know what I have read on this Website posted by those that have done it. Something to do with the front drive shaft hitting the tranny pan when the A.A. setup is used?? Not sure about it, but I do remember reading at least a couple of Members having this type of trouble.

72longbed

HOTFUN · 05-07-2005, 12:45 PM

This is where my research and plans are going as I agree with everything 71swb has said. The local transmission rebuilder said I need a pre '87 (non ECM electronic)700R4 4x4 tranny which is prior to computer/electronics and one he can easily upgrade with all needed advances. He will use the new aftermarket main shaft while into the rebuild for the correct tailshaft hookup to the 205 shaft. The transmission will bolt right up to the original automatic-205 T case and which is still mounted in the original position so the driveshafts and 205 stay right where they were originally. The 700R4 transmission is 1 3/4" longer as mentioned so I will have to relocate my engine cradle/ engine forward that same amount which frees up more firewall clearance and doesn't hurt anything with the 4WD deep tunnel radiator shroud. The original speedometer cable is fine as is and still goes to the 205 case so no problems there either.
So if our calculations are right, I need a rebuildable 700R4 4x4 tranny core, an aftermarket main shaft, a correct length tv cable mounting bracket( as this is the most critical operation on the 700R4). This is what the transmission shop and I agree is what is needed. Does anyone else disagree?
Mark

breeh · 05-07-2005, 01:24 PM

I have never heard about this clearance issue before when using the AA shaft. I have one in mine and have been using it for 3 years with zero problems.

**special-K** · 05-07-2005, 07:25 PM

I think I`ll be doing the Advaced Adaptors swap.I will be tearing the 700r4 down to overhaul anyway.

HOTFUN · 05-08-2005, 07:54 AM

Special K
Let us know how this all works out as I will be building my new 72 K20 with this set up. Mine won't have anymore than the factory stock lift though.
Mark

**special-K** · 05-11-2005, 07:34 AM

Will do.It`ll be a while.Mine will be lifted(4-6").

Clmnz · 05-18-2005, 02:18 AM

I'm interested too so please keep posted. I have a question on moving the engine forward. I realize there is room but what will have to happen for that to be accomplished? I'm questioning as I am in the middle of a new exhaust system installation, and just realized I need to make sure it will stretch another 1 3/4" in the near future. Thanks for the input guys, I am gathering information as we speak and am starting to look for parts/tranny/etc, so any details are appreciated. Thanks, Rod

04-22-2005, 07:43 AM	#1
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Q?:700r4 in`72 K/20 My neighbor is parting an`86 K/5 w/700r4.I want to put O/D in my`72 K/2500.What all should I get from this vehicle?It has no engine,otherwise complete.I know my NP205 is hard to beat.So,should I adapt this or is the T-case from the`86 good enough(cheaper route)?This is a Lo-Pro slide-in camper hauler(light)and the most "wheeling" would be on the beach(rarely). __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

04-23-2005, 09:37 PM	#2
Cethern What was I thinking?? Join Date: Dec 2003 Location: Commerce City Co Posts: 636	spacer Get the 700r and the wiring harness for the 700r or get one from painless. maybe the crossmember Then get the spacer to mate the 700r to a 205 In these two pic's you can see the spacer I used in my 83K5 I will use the same thing when I get around to adding OD to my 72 and 71 Attached Images __________________ 72 K5 that needs lots of parts.. 71 GMC 3/4 4x4 That doesn't need much which is a good thing I don't think I could aford another money pit...

04-27-2005, 10:18 PM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Thanks Cethern.Is that Advaced Adaptors? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

04-30-2005, 09:22 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Hey 72Longbed,thanks.That`s the stuff I was looking for and I have all that,including HEI.That adapter from Red`s is what I wanted to go with.I`ve seen all this before and now it`s all in one place,except Red`s contact info.Anyone?I was considering just using the Blazer`s t-case to be cheap.But,nah,gotta have the 205.I plan on having the 700r purpose-built according to axle/tire/hp/use.Should I just get harness from Painless?Or,use what`s in the Blazer.Is it a stand-alone harness?What other components are involved,ECM? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 04-30-2005 at 09:24 AM. Reason: wrong harness maker

04-30-2005, 08:57 PM	#8
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	72 longbed, a couple of comments: I am pretty sure the 700r4 is 1 3/4" longer than the TH350, before you add that adapter into the picture. So it would be 1 3/4" plus the width of the adapter. Also - if you are doing #5, you will have no reason to do #6. And if you don't do #5 you will have to shorten the rear drive shaft and lengthen the front drive shaft. You can do all of this without that aluminum adapter, but it requires the special output shaft from Advance Adapters, which adds some $$ to the whole deal. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

04-27-2005, 11:37 PM	#4
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Cethern..was that 700r4 you put in there from a 4x4 to start? Wondering why the spacer?

04-28-2005, 08:42 AM	#5
72longbed Account Suspended Join Date: Jun 2003 Location: PA Posts: 1,411	700R4 and NP205 I've been 'bopping' around a couple of websites for a few months now regarding this subject and have learned quite a bit about this conversion so that I can complete it properly for my 71 K20. Here goes: 1. You need to start with a 4WD 700R4. 2. You need an NP205 that was originally mated to a TH350 along with it's factory transfer case adapter. 3. You will need to buy the alluminum 'spacer' from Reds to go between the factory transfer case adapter and the transmission. 4. You will have to cut about 3/16" off the end of the transmission output shaft. 5. If you would like to bolt the transfer case and transmission crossmember to the factory locations, you will be moving your engine cradle and frame mounts about 1 3/4" forward, (not a bad thing at all). 6. You will probably have to have your front driveshaft re-sized to fit. 7. You will now be able to take the Cap off your HEI distributor without large volumes of profanity. 8. You will experience lower RPM at cruise speeds and an awesome 1st gear 'digger'. Of course you should make sure to have your 700R4 set up properly with a good quality TV cable, and I recommend using a fluid pressure guage to check all of your setting before driving the new setup. Theres other small things that go with converting over to an overdrive tranny, but listed above are the major chores. Not a real big deal if you are fortunate enough to be starting out with a 4WD 700R4. I have a 2WD 700R4 and will have to have a GM 4x4 output shaft installed in it before I can proceed forward with the project. 72longbed Last edited by 72longbed; 04-28-2005 at 08:44 AM.

04-29-2005, 12:38 PM	#6
Cethern What was I thinking?? Join Date: Dec 2003 Location: Commerce City Co Posts: 636	Special-K I got the spacer and the 205 from a CK5 member but I'm pretty sure he got the spacer from A-Red's out of St Louis mo. Rod The was a 700r out of my 83 K5 I added the 205 when the 208 went south when the rare drive shaft broke loose and broke the case into a few parts.... 72Longbed I agree with you and would add a tranny cooler __________________ 72 K5 that needs lots of parts.. 71 GMC 3/4 4x4 That doesn't need much which is a good thing I don't think I could aford another money pit...

05-01-2005, 01:05 AM	#9
72longbed Account Suspended Join Date: Jun 2003 Location: PA Posts: 1,411	71swb4x4, I see that the next step for you is a 700R4. Please keep us all informed as to the method that you undertake to accomplish this. I've only heard bad feedback about the Advance Adapters output shaft and the clearance problems related to it. But hey, you could get lucky and not have a problem. 72longbed

05-01-2005, 08:55 AM	#10
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	My whole setup was already together once. The transmission case is cracked so I have to rebuild it all, then put it together again. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

05-06-2005, 07:08 AM	#12
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	You`re right Richard.I wouldn`t put a trans in a truck w/o a rebuild first.Spend a little extra there and you don`t add that length to the drivetrain.Also,saves cutting tip of input shaft.It`s all a trade-off. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-06-2005, 08:52 AM	#13
72longbed Account Suspended Join Date: Jun 2003 Location: PA Posts: 1,411	As far as clearance problems, I only know what I have read on this Website posted by those that have done it. Something to do with the front drive shaft hitting the tranny pan when the A.A. setup is used?? Not sure about it, but I do remember reading at least a couple of Members having this type of trouble. 72longbed

05-07-2005, 12:45 PM	#14
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	This is where my research and plans are going as I agree with everything 71swb has said. The local transmission rebuilder said I need a pre '87 (non ECM electronic)700R4 4x4 tranny which is prior to computer/electronics and one he can easily upgrade with all needed advances. He will use the new aftermarket main shaft while into the rebuild for the correct tailshaft hookup to the 205 shaft. The transmission will bolt right up to the original automatic-205 T case and which is still mounted in the original position so the driveshafts and 205 stay right where they were originally. The 700R4 transmission is 1 3/4" longer as mentioned so I will have to relocate my engine cradle/ engine forward that same amount which frees up more firewall clearance and doesn't hurt anything with the 4WD deep tunnel radiator shroud. The original speedometer cable is fine as is and still goes to the 205 case so no problems there either. So if our calculations are right, I need a rebuildable 700R4 4x4 tranny core, an aftermarket main shaft, a correct length tv cable mounting bracket( as this is the most critical operation on the 700R4). This is what the transmission shop and I agree is what is needed. Does anyone else disagree? Mark __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"

05-07-2005, 01:24 PM	#15
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	I have never heard about this clearance issue before when using the AA shaft. I have one in mine and have been using it for 3 years with zero problems. Attached Images __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

05-07-2005, 07:25 PM	#16
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	I think I`ll be doing the Advaced Adaptors swap.I will be tearing the 700r4 down to overhaul anyway. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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05-08-2005, 07:54 AM	#17
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	Special K Let us know how this all works out as I will be building my new 72 K20 with this set up. Mine won't have anymore than the factory stock lift though. Mark __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"

05-11-2005, 07:34 AM	#18
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Will do.It`ll be a while.Mine will be lifted(4-6"). __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-18-2005, 02:18 AM	#19
Clmnz Registered User Join Date: Oct 2003 Location: Scottsdale, AZ Posts: 11	I'm interested too so please keep posted. I have a question on moving the engine forward. I realize there is room but what will have to happen for that to be accomplished? I'm questioning as I am in the middle of a new exhaust system installation, and just realized I need to make sure it will stretch another 1 3/4" in the near future. Thanks for the input guys, I am gathering information as we speak and am starting to look for parts/tranny/etc, so any details are appreciated. Thanks, Rod

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