4+3 trans

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May 25, 2009 | 07:29 PM

SEAFOUR

Thread Starter

Intermediate

Joined: Sep 2008

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From: BAYVILLE NEW JERSEY

4+3 trans

have no reverse goes in and wants to but only very little movement acts like its slipping could the overdrive unit cause this???

May 25, 2009 | 07:46 PM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

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From: Australia

I believe no reverse is a sign of faulty Od unit

May 25, 2009 | 08:27 PM

Mark85Vett

Pro

Joined: Oct 1999

Posts: 515

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From: Nashua NH

May 26, 2009 | 12:47 AM

powerpigz-51

Drifting

Joined: May 2006

Posts: 1,428

Likes: 7

From: Chewelah Wa

I hate to tell ya, but it is toast. Good used units are available, go with a later one as they are an improvement over the early ones. I got my 88 on E-bay for 500 bucks.

May 26, 2009 | 09:02 AM

RacerX70CC

Melting Slicks

Joined: Nov 2004

Posts: 2,799

Likes: 2

From: Cape Coral FL

you'll laugh... you'll cry.... you'll kiss your OD unit "good bye"!

OD unit is toast

May 26, 2009 | 09:07 AM

DPC Racing

Advanced

Joined: Dec 2007

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Pull the fill plug on od unit and you will see gear oil and atf mix,its done.

May 27, 2009 | 08:16 PM

SEAFOUR

Thread Starter

Intermediate

Joined: Sep 2008

Posts: 40

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From: BAYVILLE NEW JERSEY

Hey guys thanks for the info my od is gaput! Are the parts to rebuild it avalible anywhere????

May 27, 2009 | 08:44 PM

skybolt31

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Joined: Dec 2003

Posts: 1,491

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From: Westfield MA

If your car is basically stock, you might want to consider a T-5 swap, a trans from a V8 camaro should be up to the task:

http://members.cisdi.com/~anesthes/f-car-t5/

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May 28, 2009 | 12:06 AM

coupeguy2001

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Joined: Sep 2006

Posts: 6,050

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From: Phoenix AZ

2021 C4 of the Year - Modified Finalist

my overdrive was slipping, but the reverse never went out. The answer was to replace the unit with a serviceable one until I could figure out how to do a rebuild without paing someone else to do what I could do if I only had a couple tools.
I separated the 2 vent tubes coming off of the overdrive and the trans 4 speed part. i noticed that there was a good chance that the units could mix fluid if one or the other vented fluid.
I made a couple aircraft stainless hoses the right length, unscrewed the vents out of the trans, tapped the holes for pipe thread, and ran the two vents side by side up to the top of the firewall, and used little K&N filters about 1 inch high to vent the units.

Last edited by coupeguy2001; May 31, 2009 at 12:23 PM.

May 28, 2009 | 03:02 AM

#10

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

Likes: 31

From: Australia

Quote:

Originally Posted by SEAFOUR

Are the parts to rebuild it avalible anywhere????

Background info
http://corvetteobsession.homestead.c...formation.html

http://www.5speeds.com/dne.htm

Repairer
http://www.pipersauto.com/4speeds.html

Parts supplier, took over 5speeds.com above repair service
http://www.skspeed.com/

DIY rebuild
http://www.corvetteactioncenter.com/...Overdrive+Unit

May 30, 2009 | 02:08 PM

#11

powerpigz-51

Drifting

Joined: May 2006

Posts: 1,428

Likes: 7

From: Chewelah Wa

If it is slipping, it may not be rebuildable, as the part that is slipping has lost its grip with the case. I may be wrong on that.....contact a rebuilder in one of those links provided.

May 30, 2009 | 06:02 PM

#12

c4cruiser

Team Owner

Joined: Dec 1999

Posts: 34,873

Likes: 487

From: Lacey WA RVN 68-69

NCM Sinkhole Donor

Quote:

Originally Posted by skybolt31

If your car is basically stock, you might want to consider a T-5 swap, a trans from a V8 camaro should be up to the task:

http://members.cisdi.com/~anesthes/f-car-t5/

As pointed out in the link, the T-5 is weak and would not handle the output from the Corvette L98 for long. And there are mods required to get the T-5 to fit properly.

SK-Speed is supposed to have a good reputation for rebuilding the 4+3 and they should have replacement OD units you can buy and return your old OD. Repairing the OD unit requires special tools and it's not a good idea to DIY if you don't have experience with rebuilding this unit.

If you do replace the OD, it's a good idea to go thru the 4-speed portion or at least inspect it for wear. The 4-speed is a Borg-Warner Super T-10.

Once it's back together, you should do an annual OD fluid and filter change to insure long life.