NP205 pics & advise needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cheyenne10 · 01-29-2005, 12:42 AM

I need to make a decision on trans and T-case for BB 4x4 project. Many recommend getting 2 wheel drive T400, use my T350 205 trans case and buy Advanced adapter kit to mate and rebuild all and will be good to go.

My other option is to buy a seperate NP 205 case I am looking at and use with T400 or I still like idea of 700R4 if it will hold up. Burb is heavy and will haul and tow occassionly.

I want T-case with torque mount holes already, does anyone have good pics of differences in 205 t-cases?

One I'm looking at is tagged "MODEL 205 RATIO 196 SERIAL #10 11 76 ASSEM # 3987901" what is it?

I also have a line on a T400 adapter for T-case. Does anyone have a picture of one of these to? (figure 8 type)

AA kit is spendy too so I want to consider all my options. I want strongest and smoothest setup for best costs. (nothing new) Lots of variables.

HOTFUN · 01-29-2005, 12:29 PM

I am interested in this project too. I talked to the transmission guy and he suggested using a 4x4 700R4 and somewhere there is an aftermarket adapter shaft to replace in the 700R4 to make it mate right up to the original 205 case. He said with all the latest updates to that 700R4 these are very dependable for truck applications. Then the only thing else needed is to move the engine mounts forward 1.5 inches. This sounded like a great way to do this if I can find that replacement aftermarket tranny shaft to go from 700R4 to 350 turbo length splines. Anyone done this before?

cheyenne10 · 01-29-2005, 01:46 PM

I have been talking with board member Breeh who has a 427 infront of 700R4 and NP205. He bought bowtie overdrives type 3 trans for HD use. He is very happy. The trans he bought bolted right up to his stock adapter and 205. Actually sounds more cost effective than other route I'm pursuing. I do need reliabilty and towing/hauling function which I think can be had with lockup converter mode.

I need to figure out for sure engine compartment configuration and interferences though. It gets tighter in there!! I have heard 1.5-2.0 inches forward for motor and other route is closer to 2.5" I beleive. Plan to run stock manifolds, and stock 2 wheel drive BB PS, alternator and AC stuff. I like to plan this out so not too many surprises or comprimises when it gets to assembly.

Rod · 01-29-2005, 02:25 PM

The turbo 400 transfer case adapter is different than a 4spd or 350 turbo set up...here are pics if a turbo 400 to NP 205 adapter...note the 6 holes to mount the turbo 400 tranny. With a 350turbo or even a 700r4 would have a 4 hole adapter mounting in the one side. SM465 4 speed is different again.

cheyenne10 · 01-29-2005, 03:06 PM

Rod; Awesome pics thanks. You have the greatest collection of pics. parts and knowledge. You must have good organization of computer files. I assume you are sanpping some of these for our questions which is awesome help.

What is one of these adpaters in good shape worth?

Can I make a T400 2 wheel drive trans work with this adapter and my T350 - 205 t-case or do I need a 4 wheel drive T400 to start with?

1969 GMC · 01-29-2005, 06:34 PM

that is the "old" style 400/205 adapter. there is another one, that only has 6 botls on the transfer case side. i will try to find pics.

as far as my opinion, go with a divorced 205 behind your 2wd th400.

kennyw · 01-29-2005, 08:44 PM

Quote:

Originally Posted by 1969 GMC

that is the "old" style 400/205 adapter. there is another one, that only has 6 botls on the transfer case side. i will try to find pics.

as far as my opinion, go with a divorced 205 behind your 2wd th400.

Another bonus here is you get to make your front and rear drivelines the same length if you plan it out right. This makes it possible to only need one spare.

cheyenne10 · 01-29-2005, 11:53 PM

I think I want old style adapter. Anyone know a fair price on good clean one?

**kwmech** · 01-30-2005, 12:07 AM

Last time I looked for a 400/205 adaptor I had to buy one from the dealer and forked out over 300. There is however a guy up in New York that seems to have a lot of stuff going thru his shop constantly. He occasionally puts stuff on Ebay. The only other thing is to make up your mind on which trans you will use the 400 or the 700.

cheyenne10 · 01-30-2005, 12:12 AM

Can a 2 wheel drive T400 be used in combination with old style T400 adpater and my T350 - NP205 transfercase?

If this can work what type of length difference will I have from T350 and NP205 setup?

I beleive what I have heard is that I can get bowtie OD unit to work with my T350 adapter and T350 NP205 case.

Rod · 01-30-2005, 05:19 PM

Some transfer case set up pic's

turbo 400 application NP 205 pics.

cheyenne10 · 01-30-2005, 05:32 PM

Ok, the top one you posted Rod has the "short" 32 spline female input shaft. Can this shaft be bought and put in place of the male 27 spline I should have on my T350 transfercase?

Just did some more reading and it looks like to do this the transfer case has to be machined for larger bearing for the shaft (after total disassembly).

Rod · 01-30-2005, 08:44 PM

Let me think on this...

If you have a turbo 350 automatic type transfer case and adapter for such you can bolt a 4wd 700r4 to it. You can use the 350 spline adapter as both the turbo 350 and 700r4 have the same 27 spline count.

If you have a turbo 400 tansfer case ands such adapter...well leave it as a turbo 400 would be my advice. The ourtput shafts froma 2wd to 4wd transmission are different lenghts. You pretty much have to replace the output shaft of a 2wd tranny to use it in 4wd applications regardless of the tranny.

Now if you find a divorced 205...use what ever tranny you want from a 2wd.
You could use a Dodge 205 or a GM 205 as they use the same side for output to front drive shaft.

Any np205 can be machine out and have a 400 style transmission input placed in it to accept the 400 tranny. It gets costly but could be less costly than using an advanced adpater set up. Advance adapter lists its applications on its web site...you can get adapters for any NP 205 set up to pretty much any tranny type also.

Advance adapter is not the only game, there are others too.

Rod · 01-30-2005, 08:48 PM

More pics
these are of a different style turbo 400 adapter to a NP 205. These are from 1985 to 1991 applications..thats what was said in the listing here on the board is where they were for sale back when.

Rod · 01-30-2005, 08:53 PM

Heres a site that lists pretty good stuff on 205 input shaft differences.

http://www.offroaddesign.com/NP205tech.htm

Rod · 01-30-2005, 08:59 PM

This thread is about the same question read it over too. http://67-72chevytrucks.com/vboard/s...5&page=2&pp=25

cheyenne10 · 02-04-2005, 01:45 AM

Ok, any opinions on which T400 to NP205 adpater is best? The older figure 8 verison or newer round verison?

What is the stock length of a T400, adapter and NP205? I need to plan into this location of cross member, drieveshafts and motor mounts for BB. What motor mounts are used with installing BB in 4x4 (I'm moving motor foreward, depending on trans setup how far.)

Rod · 02-04-2005, 02:31 AM

tranny length site http://www.tciauto.com/tech_info/trans_dims.htm

transfer case measurement site
http://www.truckpulls.com/Transferca...mage_Index.htm

Dont know whats better dont own either,..wouldn't mind one though..Ill be looking.

Your drive line shaft are gonna be different depending what year type transfer case you get.. some have fixed ujoint front or fixed yoke plate up front. The rears have slip yoke or fixed ujoint type. Would be best to find what you need or ask for the few different lenght dimensions from what others have and ask what combination there is.

01-29-2005, 12:29 PM	#2
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	I am interested in this project too. I talked to the transmission guy and he suggested using a 4x4 700R4 and somewhere there is an aftermarket adapter shaft to replace in the 700R4 to make it mate right up to the original 205 case. He said with all the latest updates to that 700R4 these are very dependable for truck applications. Then the only thing else needed is to move the engine mounts forward 1.5 inches. This sounded like a great way to do this if I can find that replacement aftermarket tranny shaft to go from 700R4 to 350 turbo length splines. Anyone done this before? __________________ '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"

01-29-2005, 01:46 PM	#3
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	updates I have been talking with board member Breeh who has a 427 infront of 700R4 and NP205. He bought bowtie overdrives type 3 trans for HD use. He is very happy. The trans he bought bolted right up to his stock adapter and 205. Actually sounds more cost effective than other route I'm pursuing. I do need reliabilty and towing/hauling function which I think can be had with lockup converter mode. I need to figure out for sure engine compartment configuration and interferences though. It gets tighter in there!! I have heard 1.5-2.0 inches forward for motor and other route is closer to 2.5" I beleive. Plan to run stock manifolds, and stock 2 wheel drive BB PS, alternator and AC stuff. I like to plan this out so not too many surprises or comprimises when it gets to assembly. __________________ Bob

01-29-2005, 02:25 PM	#4
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	The turbo 400 transfer case adapter is different than a 4spd or 350 turbo set up...here are pics if a turbo 400 to NP 205 adapter...note the 6 holes to mount the turbo 400 tranny. With a 350turbo or even a 700r4 would have a 4 hole adapter mounting in the one side. SM465 4 speed is different again. Attached Images __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-29-2005, 03:06 PM	#5
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	T400 adapter Rod; Awesome pics thanks. You have the greatest collection of pics. parts and knowledge. You must have good organization of computer files. I assume you are sanpping some of these for our questions which is awesome help. What is one of these adpaters in good shape worth? Can I make a T400 2 wheel drive trans work with this adapter and my T350 - 205 t-case or do I need a 4 wheel drive T400 to start with? __________________ Bob Last edited by cheyenne10; 01-29-2005 at 03:16 PM.

01-29-2005, 06:34 PM	#6
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	that is the "old" style 400/205 adapter. there is another one, that only has 6 botls on the transfer case side. i will try to find pics. as far as my opinion, go with a divorced 205 behind your 2wd th400. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

01-29-2005, 12:42 AM	#1
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	NP205 pics & advise needed I need to make a decision on trans and T-case for BB 4x4 project. Many recommend getting 2 wheel drive T400, use my T350 205 trans case and buy Advanced adapter kit to mate and rebuild all and will be good to go. My other option is to buy a seperate NP 205 case I am looking at and use with T400 or I still like idea of 700R4 if it will hold up. Burb is heavy and will haul and tow occassionly. I want T-case with torque mount holes already, does anyone have good pics of differences in 205 t-cases? One I'm looking at is tagged "MODEL 205 RATIO 196 SERIAL #10 11 76 ASSEM # 3987901" what is it? I also have a line on a T400 adapter for T-case. Does anyone have a picture of one of these to? (figure 8 type) AA kit is spendy too so I want to consider all my options. I want strongest and smoothest setup for best costs. (nothing new) Lots of variables. __________________ Bob

01-29-2005, 11:53 PM	#8
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	old style adapter I think I want old style adapter. Anyone know a fair price on good clean one? __________________ Bob

01-30-2005, 12:07 AM	#9
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,499	Last time I looked for a 400/205 adaptor I had to buy one from the dealer and forked out over 300. There is however a guy up in New York that seems to have a lot of stuff going thru his shop constantly. He occasionally puts stuff on Ebay. The only other thing is to make up your mind on which trans you will use the 400 or the 700.

01-30-2005, 12:12 AM	#10
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	T400 Can a 2 wheel drive T400 be used in combination with old style T400 adpater and my T350 - NP205 transfercase? If this can work what type of length difference will I have from T350 and NP205 setup? I beleive what I have heard is that I can get bowtie OD unit to work with my T350 adapter and T350 NP205 case. __________________ Bob

01-30-2005, 05:19 PM	#11
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Some transfer case set up pic's turbo 400 application NP 205 pics. Attached Images __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-30-2005, 05:32 PM	#12
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	modifying transfer cases Ok, the top one you posted Rod has the "short" 32 spline female input shaft. Can this shaft be bought and put in place of the male 27 spline I should have on my T350 transfercase? Just did some more reading and it looks like to do this the transfer case has to be machined for larger bearing for the shaft (after total disassembly). __________________ Bob

01-30-2005, 08:44 PM	#13
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Let me think on this... If you have a turbo 350 automatic type transfer case and adapter for such you can bolt a 4wd 700r4 to it. You can use the 350 spline adapter as both the turbo 350 and 700r4 have the same 27 spline count. If you have a turbo 400 tansfer case ands such adapter...well leave it as a turbo 400 would be my advice. The ourtput shafts froma 2wd to 4wd transmission are different lenghts. You pretty much have to replace the output shaft of a 2wd tranny to use it in 4wd applications regardless of the tranny. Now if you find a divorced 205...use what ever tranny you want from a 2wd. You could use a Dodge 205 or a GM 205 as they use the same side for output to front drive shaft. Any np205 can be machine out and have a 400 style transmission input placed in it to accept the 400 tranny. It gets costly but could be less costly than using an advanced adpater set up. Advance adapter lists its applications on its web site...you can get adapters for any NP 205 set up to pretty much any tranny type also. Advance adapter is not the only game, there are others too. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-30-2005, 08:48 PM	#14
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	More pics these are of a different style turbo 400 adapter to a NP 205. These are from 1985 to 1991 applications..thats what was said in the listing here on the board is where they were for sale back when. Attached Images __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-30-2005, 08:53 PM	#15
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Heres a site that lists pretty good stuff on 205 input shaft differences. http://www.offroaddesign.com/NP205tech.htm __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-30-2005, 08:59 PM	#16
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	This thread is about the same question read it over too. http://67-72chevytrucks.com/vboard/s...5&page=2&pp=25 __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.



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02-04-2005, 01:45 AM	#17
cheyenne10 Senior Member Join Date: Apr 2000 Location: Oregon Posts: 2,512	still trying to figure out Ok, any opinions on which T400 to NP205 adpater is best? The older figure 8 verison or newer round verison? What is the stock length of a T400, adapter and NP205? I need to plan into this location of cross member, drieveshafts and motor mounts for BB. What motor mounts are used with installing BB in 4x4 (I'm moving motor foreward, depending on trans setup how far.) __________________ Bob

02-04-2005, 02:31 AM	#18
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	tranny length site http://www.tciauto.com/tech_info/trans_dims.htm transfer case measurement site http://www.truckpulls.com/Transferca...mage_Index.htm Dont know whats better dont own either,..wouldn't mind one though..Ill be looking. Your drive line shaft are gonna be different depending what year type transfer case you get.. some have fixed ujoint front or fixed yoke plate up front. The rears have slip yoke or fixed ujoint type. Would be best to find what you need or ask for the few different lenght dimensions from what others have and ask what combination there is. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

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