Hey, is it possible to swap a 4l60e to 700r4? Well, I know it is, but what is involved.

Or... I could just fix the 4l60e... I'm told it doesn't go into overdrive. What would cause that?

I don't have much info right now because I just bought the truck and I haven't driven it yet.

Any help would be greatly appreciated.

You need a pre 87 700 for it to shift properly it is an easy thing to do, a couple of vacum switches and youre in as for the 4l60e it needs third/fourth clutches more than likley

Why does it have to be a pre 87?

You could use any 700R4 if you wanted. However, the problem would be in getting the proper VSS signal to the pcm. it could be done, but it really woundn't be worth it. you might save a little on the tranny only to spend on trying to maintain VSS.

pre 87 has no computer control

pre 87 has no computer control
No 700R4 transmissions were ever controlled by the ecm. The lockup function is grounded with the ecm, but not the shift points like the 4L60E that replaced it. Any 700R4 will work in any application. You may have to modify the tailshaft on two wheel drive versions to hookup a speedo cable for those that came magnetic sensors for VSS.

If it uses the 4l60E then it also uses a PCM (not ecm) and just putting a 700R4 in will set codes because the pcm can't talk to the tranny, also VSS is required for the pcm to function properly. They are much smarter than the old TBI units that just have off idle problems when you don't use a VSS. Fix the tranny.

If it uses the 4l60E then it also uses a PCM (not ecm) and just putting a 700R4 in will set codes because the pcm can't talk to the tranny, also VSS is required for the pcm to function properly. They are much smarter than the old TBI units that just have off idle problems when you don't use a VSS. Fix the tranny.
Where did someone say a 4L60E used a PCM? Please read carefully!

Admit I'm kinda tired today but isn't he saying going to a 700R4 from a 4L60E? Or did I miss something? Since putting in a 700R4 means he's still using it in a truck that had a 4l60E, hense it's still got a PCM that now can't talk to the 4L60E that used to be there and will set codes/not function properly, that very same PCM needs VSS to function properly, I'd say stick with the 4L60E cause it's all around easier. :confused:

Where did someone say a 4L60E used a PCM? Please read carefully! Umm, I just did, twice now :D

Admit I'm kinda tired today but isn't he saying going to a 700R4 from a 4L60E? Or did I miss something? Since putting in a 700R4 means he's still using it in a truck that had a 4l60E, hense it's still got a PCM that now can't talk to the 4L60E that used to be there and will set codes/not function properly, that very same PCM needs VSS to function properly, I'd say stick with the 4L60E cause it's all around easier. :confused:

Umm, I just did, twice now :D
I meant ECM, I guess it's me that should pay attention. I think you got the point though. I do agree that he should stay with the 4L60E.
Considering I just walked 13 miles to go see a waterfall. maybe I should go see a doctor.

Weird thing is that the 700 R4 and the 4L60E are basically the same tranny except the controls so there is no real gain to be made by the swap.

Check out the Sonnax web site for potential fixes. There are a couple common problem areas to be addressed in the transmission.

I did a pre-emptive strike in my Trailblazer (tow rig) 4L60E tranny by installing the new 1-2 shift valve kit (bores out the aluminum valve body and replaces it with a steel sleeve and also boosts psi in the 1-2 shift) and inserting a pin-less accumulator (leaks and bleeds off apply pressure to the band). It shifts real nice now.

http://www.transmissionspecialty.com/parts/DM/4L60-E.htm

you need to have a kick down cable for the 700r4 from the trhottel boddy it's the only way the tranny knows how to shift
PAS

If this is a 4wdr truck, the VSS is in the t-case, and both the 700R4 and 4L60E will bolt up to that t-case provided they have the 4wdr output shaft and adapter.

The 700R4 does not use a kick down cable. It is controlled by a tv cable. A tv cable phyiscally controls shifting in the 700R4. A TH350 uses a kick down.

The problem with going from the 4L60E to the 700R4 is the puter control. Like mentioned above, the engine and tranny function as a team and without one the other has issues. You could make it work without the tranny, but why go through that expense?

It costs just as much to rebuild the 4L60E as it does to rebuild the 700R4.
Rebuild the 4L60E tranny. There is a ton of upgrades for this tranny. Talk to the rebuilder and tell them what your intended uses are. He will make some recommendations for the upgrades.

Personally, there are a few that shouldn't be an option. Pinless accumulators, and a heat treated reaction sun shell are two of them. I also highly recommend high energy rebuild kits, and kevlar clutch packs 2/4 band.