700R4 questions
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7th Gear
Joined: May 2011
Posts: 7
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700R4 questions
My transmission is wrecked in my '87 and I want to replace it either with a rebuilt transmission or buy a used one from somebody. Can I use a transmission out of an '86 since it is also a L98 or are their differences?
Melting Slicks
Joined: Nov 2008
Posts: 2,765
Likes: 5
Many internal upgrades were made in 1987 by GM Hydromatic & Corvette engineers.
Auxillary valvebody engineered into the mid year ( Feb/March 1987) was a very big improvement.
No more gear change banging from reverse to drive like earlier 700r4 transmisions did.
Has a heavy duty 16 element input sprag.
Recalibrated valvebody.
New & improved input drum, steels, forward clutch, over run clutch,
& 3-4 clutch.
Many other changes in 1987 carried over to the later C4 700R4's too.
BR
Last edited by 87 vette 81 big girl; Jun 7, 2011 at 09:04 PM.
Melting Slicks
Joined: Nov 2008
Posts: 2,765
Likes: 5
yes.
I would avoid the 1986 version myself.
Your original 87 trans with auxillary valve body &
other improvments make the trans 5 times better than the 86 to use.
I would rebuild the 87 trans. myself
What I did last year with my original 87 trans. & blueprinted it.
BR
I would avoid the 1986 version myself.
Your original 87 trans with auxillary valve body &
other improvments make the trans 5 times better than the 86 to use.
I would rebuild the 87 trans. myself
What I did last year with my original 87 trans. & blueprinted it.
BR
Melting Slicks
Joined: Nov 2008
Posts: 2,765
Likes: 5
Takes alot of research to discover all secrets to building a bullet proof 700r4 trans.
Not all is on the internet or by google search.
Only 2 professional trans rebuilders out 50 would disclose all tricks & mods to me.
Not all is on the internet or by google search.
Only 2 professional trans rebuilders out 50 would disclose all tricks & mods to me.
