700r casting numbers
Thread Starter
Senior Member
Joined: Oct 2004
Posts: 965
Likes: 2
From: SE, Ohio
Car: '86 Z28, '91 RS
Engine: 305ci, 305ci
Transmission: TH200c (no kidding), TH700r4
Axle/Gears: 2.73, 2.73
700r casting numbers
I'm trying to figure out if I want to rebuild my 86's old trans or scrap it and get a new core.
It's not in the car, it lost 3rd gear, made it home and wouldn't go back into drive. The transmisson in there now is starting to slip 3rd and on top of that is a TH200c.
There's a tag that says "Service Replacement Transmission Assembly" and stamped with GM.
The output shaft has 30 splines
The numbers I found on the trans are;
pump: 8642380
tag: 6YPM4
and there's also a serial number.
I'm hoping it has the auxiliary valve body but my lucks not so good.
It's not in the car, it lost 3rd gear, made it home and wouldn't go back into drive. The transmisson in there now is starting to slip 3rd and on top of that is a TH200c.
There's a tag that says "Service Replacement Transmission Assembly" and stamped with GM.
The output shaft has 30 splines
The numbers I found on the trans are;
pump: 8642380
tag: 6YPM4
and there's also a serial number.
I'm hoping it has the auxiliary valve body but my lucks not so good.
Thread Starter
Senior Member
Joined: Oct 2004
Posts: 965
Likes: 2
From: SE, Ohio
Car: '86 Z28, '91 RS
Engine: 305ci, 305ci
Transmission: TH200c (no kidding), TH700r4
Axle/Gears: 2.73, 2.73
Re: 700r casting numbers
Anyone gotta clue?
If what I'm finding is true its a 86 transmission. It's not the original one for the car though the serial doesn't match. Is the only way to check for the auxiliary valve body to drop the oil pan?
If what I'm finding is true its a 86 transmission. It's not the original one for the car though the serial doesn't match. Is the only way to check for the auxiliary valve body to drop the oil pan?
Supreme Member
Joined: Jul 1999
Posts: 3,479
Likes: 54
From: Calimesa, California, U.S.
Re: 700r casting numbers
This is a 1986 unit from the code you have, not an auxillary valve body type. The 1988 and up are the best to start with, but do not throw this one away, as it can be good for spare parts.
Thread Starter
Senior Member
Joined: Oct 2004
Posts: 965
Likes: 2
From: SE, Ohio
Car: '86 Z28, '91 RS
Engine: 305ci, 305ci
Transmission: TH200c (no kidding), TH700r4
Axle/Gears: 2.73, 2.73
Re: 700r casting numbers
Thanks for the information 
Time to wrap it back up in plastic and store it again. Cores are easy enough to find anyway.
Time to wrap it back up in plastic and store it again. Cores are easy enough to find anyway.
Supreme Member
iTrader: (4)
Joined: Sep 2004
Posts: 2,069
Likes: 4
From: MN
Car: 85 SC, 86 Berlinetta
Engine: V6, V8
Transmission: 700r4, 700r4
Re: 700r casting numbers
This may help as well.
https://www.thirdgen.org/replace-700...c-transmission
https://www.thirdgen.org/replace-700...c-transmission
Also, behind the torque converter, look for a casting number on the front pump. If the last three digits are "732", then you have the new, improved version of the 700-R4.
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