help identifying a 700r4 and how to swap in place of T400

[1low4x4]

2 purposes of this thread. Now that I have my truck back id like to swap in a 700r4 in place of the 400. I just really want that overdrive and I figure I can pull that boat in 3rd. Overdrive would be nice for every other time. I know it has 4.10s but thats another story.

I read the thread on how to identify a 700r and looking at this one I aquired I see it has no rainbow, no serial number cause its been grinded off, but it does have the pressure taps which I think indicate an early 89 or pre 89 right? It has a sticker saying pretty much its a rebuilt gm trans and it does have a serial number on the other side on a plate. Ill post the pics up and maybe yall can help. I plan on bringing it to our trusted trans place and having them go thru it for me this week.

Second, what all do I need to change to fit this trans in my c20? I havent had time to get under there yet. Will the driveshaft need to be shortened or lengthened? Speedo and kick down cable work? What about the little 4 prong square female plug on it?

Any tips would be awesome. Thanks!

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[1low4x4]

Ok from what ive read ill need to move the trans crossmember back but i can use the same one. Also I need to shorten the driveshaft? Ill be taking the trans by the shop today

 

[MrMarty51]

 

[1low4x4]

Crickets crickets....

Dropped the 700r4 off today, guy is supposed to go thru it and contact me on what it needs. Hes a pretty reputable shop.

Someone told me I may need to actually lengthen the driveshaft not shorten. Any takers on what all needs to be done here?

 

[MrMarty51]

wake up,there`s a going on out here.

 

[Driver4r]

What are the output nose/cone lengths? the 700r4 and the th400

 

[IROCmenace]

What did you end up doing on the 700 swap? I have one sitting around and the 3 speed 400 with 4:10's is killing me.

 

[87lsxgmc]

im doing a 4l60e swap in my truck now. im having a heck of a time finding a driveshaft the right length. i found a one piece at a bone yard, but its still about 4 inches short, most likely going to find someone to cut lengthen, and balance it and run that one. if you have a 2 piece shaft, youl need just the front section for either a 700r4. being down south im sure you can find one in a bone yard. for me up north not so easy to come by. good luck.

 

[1low4x4]

Sorry guys, I ended up doing a 4L80e swap.