700R4 Questions

[1971ChevyTruck]

I have a question. I know I need the wiring kit in order to use a 700R4 tranny. Now I have to use the toggle switch to lock the converter in..when does it need locked in...what all do I need to know about this??

[Texasdeere]

I would not use a toggle to switch the tcc on and off. Most of the kits use a brake switch to turn the tcc off and are wired internally to turn the tcc on in 4th gear. (A toggle switch would be an add-on used for towing only.)

In other words, If you aren't towing anything heavy, you don't need any switches and the transmission will shift through all 4 of it's gears normally and the tcc will engage and disengage automatically.

This website has a lot of good info on what you are asking:

http://www.700r4.com/tech/tcc/

[1971ChevyTruck]

Do I need a different fly wheel...or will mine work??

[chrislehr]

Originally Posted by 1971ChevyTruck

Do I need a different fly wheel...or will mine work??

I may be wrong, but I think flywheel can stay, but the TC will need to be swapped out.

[1971ChevyTruck]

Wow thae wedsite covers almost everything...who in here has done a swap?? Can I use the stock cross member?? I am going to purchase the TV cable kit and the brake switch wiring kit---anything else I need?? I know I will have to have my driveshaft shortened...

[1971ChevyTruck]

Which 700R4 trannys are te best..I thought I seen someone say to get one out of a 88 or newer because they where built better...is this correct??

[chrislehr]

In for answers, I am considering the same swap.

Was just browsing here:
http://www.bowtieoverdrives.com/cata...m.php?ITEMID=8

And yesterday was on monstertransmissions.com for similar...

[hilljob26]

I Am Doing The Same Swap.only Mine Is A 4x4,i Too Need To Know If I Need A New Tv Cable Or Will The Stock One Work.i Have Already Purchased .500 Boost Valve,corvette Servo,holley Linkage,correct Speedo Gears,new Lock Up Solenoid,wiring To Make It Work.i Think Im On The Right Track,but Who Knows.that What All You Guys Are Here For.....to Tell Us Otherwise.lol

[Texasdeere]

Most of the time you will need to have the drive shaft shortend about 3 inches. I believe you can re-use the flywheel or flexplate. The first series 700R4s had a few problems but when re-built and offered for sale most of them have been updated so I wouldn't worry about this if buying a rebuilt unit. Usually the crossmember has to be moved back some. or replace with a pre-fabed piece depends on the truck model/year.

http://www.bowtieoverdrives.com/cata...AT&CATID=YA1A7

4wd! I was wondering how a TH700R4 would hook up to a transfer case myself. I haven't read anything on this before.

I do not have any experience with installing a 700R4 but plan on putting one in my 64 before to long.

I would do a search in the "Engine and Drivetrain" section for more info. There are a bunch of guys that have done this already on various model year GM trucks.