bad 4+3 overdrive
Thread Starter
7th Gear
Joined: Dec 2002
Posts: 7
Likes: 0
From: austin tx
bad 4+3 overdrive
okay, need help , my overdrive is shot, no reverse and full of metal shavings, i have a tight budget so i need to rebuild, so my questions are
1. can i swap out with overdrive from 87 vette
2. can i rebuild myself at home with normal tools
3. if i rebuild do i have to take out whole transmission or just overdrive
and is there anyone out there that has done this thereselves that would care to give me some tips, any and all help appreciated
thanks
85 vette z-51 4+3 only 66k and driven once a week , always something breaking but can not bear to part with
1. can i swap out with overdrive from 87 vette
2. can i rebuild myself at home with normal tools
3. if i rebuild do i have to take out whole transmission or just overdrive
and is there anyone out there that has done this thereselves that would care to give me some tips, any and all help appreciated
thanks
85 vette z-51 4+3 only 66k and driven once a week , always something breaking but can not bear to part with
Drifting
Joined: Jul 2003
Posts: 1,613
Likes: 0
From: Orlando FL
i think the OD case needs special tools to get it apart (its basically spring loaded, from what i have been told) and i imagine that it would be like rebuilding a auto tranny. and i believe that the OD units changed over time. i'm not sure if an 87 will bolt right up to an 85 or not. they may have just made internal improvements. good luck and keep us posted on your findings.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
No offense to Orlando, but I'd wait on some input from someone who's actually done it before getting scared off. FWIW, I think the ODs are interchangeable, but I haven't cracked the case open either.
Instructor
Joined: Jul 2004
Posts: 137
Likes: 0
From: CT
This link might help with OD servicing, parts info, and 84-88 interchangeability questions:
http://www.4speeds.com/dne.htm
OD rebuild kits are available so I'd imagine rebuilding should be doable at home. I'm going to pull my 4+3 over the winter to do the clutch and everything I read about the job says the ST-10 and OD are pulled as a unit.
(more 4+3 links)
www.pipersauto.com/4speeds.html
www.skspeed.com/aboutsk/transshop
http://www.4speeds.com/dne.htm
OD rebuild kits are available so I'd imagine rebuilding should be doable at home. I'm going to pull my 4+3 over the winter to do the clutch and everything I read about the job says the ST-10 and OD are pulled as a unit.
(more 4+3 links)
www.pipersauto.com/4speeds.html
www.skspeed.com/aboutsk/transshop
Last edited by 1986Z51; Nov 23, 2004 at 02:25 AM.
Racer
Joined: Dec 2003
Posts: 277
Likes: 3
Originally Posted by vettered85
okay, need help , my overdrive is shot, no reverse and full of metal shavings, i have a tight budget so i need to rebuild, so my questions are
1. can i swap out with overdrive from 87 vette
2. can i rebuild myself at home with normal tools
3. if i rebuild do i have to take out whole transmission or just overdrive
and is there anyone out there that has done this thereselves that would care to give me some tips, any and all help appreciated
thanks
85 vette z-51 4+3 only 66k and driven once a week , always something breaking but can not bear to part with
1. can i swap out with overdrive from 87 vette
2. can i rebuild myself at home with normal tools
3. if i rebuild do i have to take out whole transmission or just overdrive
and is there anyone out there that has done this thereselves that would care to give me some tips, any and all help appreciated
thanks
85 vette z-51 4+3 only 66k and driven once a week , always something breaking but can not bear to part with
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Burning Brakes
Joined: Dec 2002
Posts: 1,088
Likes: 0
From: Lakeland fl
I have lightly followed some of these 4+3 threads, and I have seen Scorp make quite a few posts on the subject. Maybe we could get him to write something up, to leave in the tech tips section. Maybe it could have links to some pertinent threads.
So Scorp, how much spare time do you have?
So Scorp, how much spare time do you have?
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I'm very familiar with the controls and electronics involved, but haven't actually cracked the case on mine, beyond removing the valve body.
I might be doing it soon though. I recall seeing techtip or webpage of scorps work
I might be doing it soon though. I recall seeing techtip or webpage of scorps work
Pro
Joined: Mar 1999
Posts: 678
Likes: 0
From: Oslo, Norway
Hi.
I have an 85 and the OD had the same symptoms. It was a main bearing that started to slipped and made the reverse gear not working. It shaved off the wall so that I had to get a new OD. The complete OD came in a wooden box and it was for the mechanic just to chnage when the tranny and the OD was taken off the car.
I had the latest version of ODs which had been reinforced installed. This did not have a control cable (mechanic) who went parallell with the throttle cable at the plenum and down to the OD. The new OD works really fine and have not had any difficulties with it since I changed. I have now had it for 35000 miles.
I have an 85 and the OD had the same symptoms. It was a main bearing that started to slipped and made the reverse gear not working. It shaved off the wall so that I had to get a new OD. The complete OD came in a wooden box and it was for the mechanic just to chnage when the tranny and the OD was taken off the car.
I had the latest version of ODs which had been reinforced installed. This did not have a control cable (mechanic) who went parallell with the throttle cable at the plenum and down to the OD. The new OD works really fine and have not had any difficulties with it since I changed. I have now had it for 35000 miles.
