Transmission question

[Wilma]

Hi!

I have a GMC Jimmy -85. 4x4 of course.

Unfortunately the TH700 broke down and it is very, very, very expensive to have these repaired in Sweden.

My question is, can I replace it with a transmission from a -89 Blazer? I know that the newer transmissions need computers to run, but I don´t know from which year.

If this is not possible, would you know how much work it would be to fit a TH350 instead? I understand that these are shorter?

Thank you for your time.
Wilma

 

[k20]

Correct me if Im wrong, but the 89 should have the same 700r4 that your 85 does.

 

[89GMCSuburban]

It should, and a matter of fact, GM improved the 700R in 89 to have longer life and handle more power...

 

[Wilma]

Thank you!

Wow, you guys are fast!
Thank you!

 

[89newtome]

trans up to 91 will work in an 85. the newer the trans the better.

 

[K5er4Life]

If you have the time and space try rebuilding it yourself. Its very easy to do and rebuild kits are cheap. You can get books that take you step by step to rebuild that trans, and if you can rebuild a motor I believe you can rebuild that trans. Just takes patience and a very clean place to work.

 

[Blue85]

The difference in computer controls after 89 is just electronic vehicle speed and the sensor is in the T-case, not the transmission, so you're good to go.

 

[Wilma]

Encouraged.

Thank you for all your help! I think I will buy this -89 TH700 and put it in my car, and after that take the good advice to try to fix my old transmission myself. (That way the car will work even if I fail, and I will learn a LOT!)

But, another question... Do you know if the plugs (there are some electrical wires going into the transmission) are the same between these model years? (Might be a stupid question, but it seems a good idea to know everything that might go wrong before attempting to put it on the car.)

Goodie, I will soon be driving beside the road again!

 

[Russell]

Should be the same as far as I am aware! Is that other 700r4 from a S-10 (small) blazer, or a K5 (fullsize, like a short pickup?)

They were different between the two, and I personally wouldn't reccomend interchanging them.

 

[Wilma]

Hi!

It´s from a fullsize as well. The guy selling calls it a K10, should be K5, right?

 

[dyeager535]

K10=1/2 ton pickup, K5=Blazer/Jimmy (still half ton, just different body)

Oh yes...and many insurance companies/department of motor vehicles don't recognize K5, they use K10 from what I've experienced, so someone could theoretically think that's what they had even if it really is a K5.