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Tranny identification Posted By: oldiron On: 07-31-2008 @ 14:06:02 Reply | Edit Have a 700r4 that needs rebuilt, I am wondering how to tell them apart. The one in the car (86 z)is NOT the same as original. I have no idea which year was installed last time. I didnt do the job. Are there numbers I can go with on the outside? Posted By: Pocket On: 07-31-2008 @ 18:35:31 Reply | Top | Edit http://tech.oldsgmail.com/trans_ident.html Google is your friend Posted By: oldiron On: 08-01-2008 @ 11:49:15 Reply | Top | Edit Hi Pocket; I realize that search engines are very helpful. The link posted tells me something about how to identify the pan on the various chevy trannies. I can identify them in my sleep, by the pan. I KNOW I HAVE A 700r4. I have not removed the pan and do NOT KNOW which year it might be. I thought perhaps that some number might exist that I had never looked for. This one seems to have a space for a sticker. But no sticker. The ones produced before 1987 have a different rebuild kit than those built after 1987. I do know about the aux valve body and once I remove the pan, I will know wether I have one or not. If I do not have one, I will still be wondering what year it is because from 85 back, I dont believe they had an aux valve body. I believe this appeared in 1986. Then disapeared in 87. I am sure to be wrong about something and am trying real hard not to take everything apart completely before knowing which major overhaul kit to order. Even though I have worked on MANY older trannies including chevy ford and even chrysler, I have never had a 700r4 apart and am still wondering what year I have because seeing the rebuild kit laying in front of you gives you a darn good idea of what you will find inside. IF ITS THE RIGHT KIT. It is probably a fact that simply replacing the valve body and rebuilding it like an 87 plus is the right way to go. I believe B&M does this with their kit and it might be the best thing to do. I was hoping to get a discussion started to learn more. Posted By: fast82Z On: 08-01-2008 @ 13:19:57 Reply | Top | Edit I believe the only important thing to know is if it's a 1984.5-up. Count how many splines are on the input shaft. 27 spline=not so good, 30 spline=84.5-up which is better. Other than different converter splines, I've herd that older ones will overheat if the converter clutch doesn't lock. -- 1982 Z28, 383, D-1SC intercooled @ 15psi, trick flow heads, solid roller cam, 3.73's, th400, 4500 stall, trans. brake, fuel injection, 10.01@135, 1.51 60' AIM:CHATV400   Posted By: Pocket On: 08-01-2008 @ 16:10:26 Reply | Top | Edit Fine, google to page 2 http://www.thirdgen.org/techboard/transmissions-drivetrain/48475-identify-early-vs-late.html?highlight=700r4+identify Posted By: camaro91 On: 08-02-2008 @ 01:39:00 Reply | Top | Edit tgo ftw!  -- '91 RS, 305 tbi, auto, flowmaster american thunder big plans!  355 lookin for 11's!  mods: tci 2500 stall, 3.73 posi, built 700r4, transgo shift kit [ Edited on 08/02/2008 @ 01:39:28 ]
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