700r4 into a 72 k5 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jsand6769 · 10-14-2010, 04:10 PM

Hello, first off I am new here, I just got my blazer to daily driver status and a friend of mine let me know about this forum, Thank you all in advance for any ifno you may have and I fully intend on droping in.

so I want to put a 700r4 in my blazer, what all needs to be done for this swap, I will be looking at a pre computer controled unit, ( not to offend any one but I do not want any fuel injection or anything computer controlled on this thing)
thanks for the help

big dump · 10-14-2010, 04:25 PM

700R4s are for the most part mechanically controlled anyway rather than computer controlled. There is a little stand alone wiring you do for the brake switch lockup control, but you won't have any problems running one with a carb. There is a lot of measuring and trial and error getting the TV valve setup right, as well as some fab work in modifying the cross member, T-Case shift linkage, and the torque converter lockup. It's not a really 'difficult' swap, but it is somewhat time consuming, dirty, and can be frustrating if doing by yourself like I did ie: wrestling with transmissions and transfer cases on your own. Link to my conversion:

http://67-72chevytrucks.com/vboard/s...highlight=700R

red71cheyenne · 10-14-2010, 05:04 PM

Welcome to the board and post up some pics of your rig!!

jsand6769 · 10-14-2010, 05:08 PM

Quote:

Originally Posted by big dump

700R4s are for the most part mechanically controlled anyway rather than computer controlled. There is a little stand alone wiring you do for the brake switch lockup control, but you won't have any problems running one with a carb. There is a lot of measuring and trial and error getting the TV valve setup right, as well as some fab work in modifying the cross member, T-Case shift linkage, and the torque converter lockup. It's not a really 'difficult' swap, but it is somewhat time consuming, dirty, and can be frustrating if doing by yourself like I did ie: wrestling with transmissions and transfer cases on your own. Link to my conversion:

http://67-72chevytrucks.com/vboard/s...highlight=700R

Thanks for the info, ill check it out, do you like the swap now that its done.

jsand6769 · 10-14-2010, 05:10 PM

Quote:

Originally Posted by red71cheyenne

Welcome to the board and post up some pics of your rig!!

I will get some pics up soon. Ive always wanted a blazer cant wait to get it done. I sold a 30k mile truck to drive this thing every day and couldnt be happier

DBear · 10-14-2010, 05:17 PM

just did this swap on my '71 K10 Suburban. Easiest way to do this is moving the engine forward about 2 inches. You will need to buy a new output shaft from advance adapters. It is about $150 and well worth it. By moving your motor forward, you do not have to lengthen or shorten your drive-shafts. And it will also give your engine a little more room in the engine bay. It will also allow the transfer case shifter to stay in it's original place too. We did this in the driveway and was fairly easy.....BUT the re-installation of the transfer case was a Pain in the Ass.

big dump · 10-14-2010, 06:20 PM

Engine forward you have to re-mount exhaust or re-route, new motor mounts or modify old ones also. Also I've heard of guys having transmission pan clearance issues on the front d-shaft at flex which is another reason I didn't go that route.. What else did you encounter by doing engine forward? Curious as to which is more/less work when you really get into it. Aside from mounting all the other issues are the same.

Skene59 · 10-14-2010, 09:58 PM

I spoke with the guys from Bowtie (considered to be one of the best shops) You will need to move the engine forward 1.625 inches. Doing so allows everything to fit You won't need modify anything

big dump · 10-15-2010, 05:35 PM

Maybe I'm missing it, but how can you move the engine forward 1 5/8" and not have to modify anything? Your exhaust isn't going to stretch, you're going to have to modify your motor mounts or something to accomodate..

man-a-fre · 10-15-2010, 07:45 PM

Also the fan shroud has to be shortened,i just did this also,the drives frame top has the 2 holes already drilled 2 inches ahead,you have to drill the other 6.I would egg shape the 2 holes in the top of the drivers side frame horn and drill the rest 1 .75 inch ahead,2 inches was a little tough to get the mm bolt in.

DBear · 10-15-2010, 08:35 PM

Exhaust will have to be modified...but I was not worried about it, since i am running new exhaust for my 6.2 diesel. I haven't had any issue with the front driveshaft hitting the pan, but have heard some have had that problem.

hgs_notes · 10-17-2010, 09:15 AM

Exhaust modification should be easy. If you are just moving it forward a couple inches, cut the tube and install a coupling to add the length you need. Done.

*Cartoonface* · 11-19-2010, 02:11 AM

I just rebuilt my 700R4 that I've had since 2000.
It's a very nice UPGRADE for the K5!
You're going to love it.
Better bottom better top, better mileage.
even without the lock-up!

But like Dbear said...putting it back in is tricky. F^$kers HEAVY with that xfer case.
I installed the tranny then the xfer case. ( I used a separate bottle jack with a plate welded to it to hold the trans in place while I fought with the xfer case on another jack to engage the splines.)
Oh.....I kept the 700R4 in lieu of the 4L60E because the adapter for the 4L60e to NP205 was @#$%ing RIdickUless!!!!!!!! Stupid abstards!
Oh...because I just installed an LQ9!!! HA!!!!!!!

vtblazer · 11-19-2010, 08:35 AM

Quote:

Originally Posted by Skene59

I spoke with the guys from Bowtie (considered to be one of the best shops) You will need to move the engine forward 1.625 inches. Doing so allows everything to fit You won't need modify anything

If the chart in the link is correct, the 700r is 2-3/8 longer.
http://www.maliburacing.com/auto_tranny_id.htm

Nother page to check out.
http://www.race-track.com/news.asp?TOPIC_ID=532

*Cartoonface* · 11-19-2010, 11:05 AM

in regard to the engine movement....I didn't do that. What I did was have new driveshafts made with C/V joints!! Mainly because of the lift I have and It's a hell of a lot easier to have a new tube weld to a slip joint that screw around moving sh*t. Besides...at 38 years old...what condition are your slip joints in?

vtblazer · 11-20-2010, 09:41 AM

Quote:

Originally Posted by Cartoonface

in regard to the engine movement....I didn't do that. What I did was have new driveshafts made with C/V joints!! Mainly because of the lift I have and It's a hell of a lot easier to have a new tube weld to a slip joint that screw around moving sh*t. Besides...at 38 years old...what condition are your slip joints in?

Good points to consider for sure when looking to do this mod.

I ended up doing a combination of moving both the tranny/t-case mount rearward and moving the engine mount forward.

I wanted to make sure both drive lines are close enough to the same length so that I'll only need to carry one spare drive line on the trails to repair either.

10-14-2010, 04:10 PM	#1
jsand6769 Registered User Join Date: Sep 2010 Location: windsor co Posts: 29	700r4 into a 72 k5 Hello, first off I am new here, I just got my blazer to daily driver status and a friend of mine let me know about this forum, Thank you all in advance for any ifno you may have and I fully intend on droping in. so I want to put a 700r4 in my blazer, what all needs to be done for this swap, I will be looking at a pre computer controled unit, ( not to offend any one but I do not want any fuel injection or anything computer controlled on this thing) thanks for the help

10-14-2010, 04:25 PM	#2
big dump Registered User Join Date: Mar 2006 Location: Gilbert, AZ Posts: 179	Re: 700r4 into a 72 k5 700R4s are for the most part mechanically controlled anyway rather than computer controlled. There is a little stand alone wiring you do for the brake switch lockup control, but you won't have any problems running one with a carb. There is a lot of measuring and trial and error getting the TV valve setup right, as well as some fab work in modifying the cross member, T-Case shift linkage, and the torque converter lockup. It's not a really 'difficult' swap, but it is somewhat time consuming, dirty, and can be frustrating if doing by yourself like I did ie: wrestling with transmissions and transfer cases on your own. Link to my conversion: http://67-72chevytrucks.com/vboard/s...highlight=700R __________________ My TBI Build: http://67-72chevytrucks.com/vboard/s...d.php?t=266614 Last edited by big dump; 10-14-2010 at 04:35 PM.

10-14-2010, 05:04 PM	#3
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: 700r4 into a 72 k5 Welcome to the board and post up some pics of your rig!! __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-14-2010, 05:17 PM	#6
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 863	Re: 700r4 into a 72 k5 just did this swap on my '71 K10 Suburban. Easiest way to do this is moving the engine forward about 2 inches. You will need to buy a new output shaft from advance adapters. It is about $150 and well worth it. By moving your motor forward, you do not have to lengthen or shorten your drive-shafts. And it will also give your engine a little more room in the engine bay. It will also allow the transfer case shifter to stay in it's original place too. We did this in the driveway and was fairly easy.....BUT the re-installation of the transfer case was a Pain in the Ass.

10-14-2010, 06:20 PM	#7
big dump Registered User Join Date: Mar 2006 Location: Gilbert, AZ Posts: 179	Re: 700r4 into a 72 k5 Engine forward you have to re-mount exhaust or re-route, new motor mounts or modify old ones also. Also I've heard of guys having transmission pan clearance issues on the front d-shaft at flex which is another reason I didn't go that route.. What else did you encounter by doing engine forward? Curious as to which is more/less work when you really get into it. Aside from mounting all the other issues are the same. __________________ My TBI Build: http://67-72chevytrucks.com/vboard/s...d.php?t=266614

10-14-2010, 09:58 PM	#8
Skene59 Registered User Join Date: May 2010 Location: Oak Park, CA Posts: 5	Re: 700r4 into a 72 k5 I spoke with the guys from Bowtie (considered to be one of the best shops) You will need to move the engine forward 1.625 inches. Doing so allows everything to fit You won't need modify anything

10-15-2010, 05:35 PM	#9
big dump Registered User Join Date: Mar 2006 Location: Gilbert, AZ Posts: 179	Re: 700r4 into a 72 k5 Maybe I'm missing it, but how can you move the engine forward 1 5/8" and not have to modify anything? Your exhaust isn't going to stretch, you're going to have to modify your motor mounts or something to accomodate.. __________________ My TBI Build: http://67-72chevytrucks.com/vboard/s...d.php?t=266614

10-15-2010, 07:45 PM	#10
man-a-fre Registered User Join Date: Jan 2010 Location: Ceresco,Ne Posts: 58	Re: 700r4 into a 72 k5 Also the fan shroud has to be shortened,i just did this also,the drives frame top has the 2 holes already drilled 2 inches ahead,you have to drill the other 6.I would egg shape the 2 holes in the top of the drivers side frame horn and drill the rest 1 .75 inch ahead,2 inches was a little tough to get the mm bolt in.

10-15-2010, 08:35 PM	#11
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 863	Re: 700r4 into a 72 k5 Exhaust will have to be modified...but I was not worried about it, since i am running new exhaust for my 6.2 diesel. I haven't had any issue with the front driveshaft hitting the pan, but have heard some have had that problem.

10-17-2010, 09:15 AM	#12
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,122	Re: 700r4 into a 72 k5 Exhaust modification should be easy. If you are just moving it forward a couple inches, cut the tube and install a coupling to add the length you need. Done. __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

11-19-2010, 02:11 AM	#13
Cartoonface Account Suspended Join Date: Mar 2004 Posts: 55	Re: 700r4 into a 72 k5 I just rebuilt my 700R4 that I've had since 2000. It's a very nice UPGRADE for the K5! You're going to love it. Better bottom better top, better mileage. even without the lock-up! But like Dbear said...putting it back in is tricky. F^$kers HEAVY with that xfer case. I installed the tranny then the xfer case. ( I used a separate bottle jack with a plate welded to it to hold the trans in place while I fought with the xfer case on another jack to engage the splines.) Oh.....I kept the 700R4 in lieu of the 4L60E because the adapter for the 4L60e to NP205 was @#$%ing RIdickUless!!!!!!!! Stupid abstards! Oh...because I just installed an LQ9!!! HA!!!!!!!

11-19-2010, 11:05 AM	#15
Cartoonface Account Suspended Join Date: Mar 2004 Posts: 55	Re: 700r4 into a 72 k5 in regard to the engine movement....I didn't do that. What I did was have new driveshafts made with C/V joints!! Mainly because of the lift I have and It's a hell of a lot easier to have a new tube weld to a slip joint that screw around moving sh*t. Besides...at 38 years old...what condition are your slip joints in?

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