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700r4 questions

Jason4x4

Jason4x4

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I know, but I searched and went back 5 pages. Can you take the internals from a pre 87 700r4 and put them in a post 87 case? Is there any differences in the cases, or is it just the internals. and does anyone have some good links to 700r4 stuff?

I got a 700r4 from a 90 s-10 blazer with a good case, and I got a built 700r4 from harley, that appears to be a pre 87 case, can I take everything from the busted pre 87 case and transplant into the post 87 case, or should I take the internals and use what I need in the post 87 case?

Please Help ME, I am going nuts.... :confused:
 
I know the later trans used an aux. valve body as well as the main valve body and that cannot be interchanged.
 
My parts manual should list the case part numbers for '85 and '88, so if those are different, the answer is going to be no. I'll check it when I get home.
 
Copy from other post.

According to the '85-88 parts manual, there are at least 6 differences in the valve body assembly, all these are obviously between the aux valve body model and ones without. I stopped counting all the annotated differences.

For general knowledge, going to throw some other info in here as I browse the pages of the manual.

There were 5 different pumps used. 7 different input shafts. There are 3 different cases, one annotated difference is the auxillary valve body.
 
A lot of the parts can interchange. The specific parts that can't be interchanged are the pump assembly and valve body. I wouldn't use the early style front sprag or the early style input drum assembly.
I would use as much of the 90 trans as possible, if possible only use the clutches out of the early trans. Make sure you use a "Beast" sun gear shell, try and use a "Z-pack" in the 3-4 clutch as the thin 9 clutch packs like to burn and warp. I generally use a wide band and make darn sure the band surface on the reverse input drum is in perfectly flat. Use at least a Corvette servo or step up to a billet servo for second and fourth.
Get yourself a ATSG manual and study it to get yourself with the procedures before you open up the transmissions, their are a few special tools required so make sure you have them as well.
 
i don't know what case or guts they used when they built that trans. All I know is they did alot of upgrades and that is not the original case to my truck. It may be a later case, check the part numbers.

Harley
 
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