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Thread size for tranny torque mount hole?

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Old 02-07-2008, 04:12 PM
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Car: 1989 GTA White Hardtop
Engine: L98
Transmission: T-5
Axle/Gears: 9 bolt 3.27
Thread size for tranny torque mount hole?

What size are the threads in the ext housing on a T-5 tranny where the torque arm mounting bolt goes? I lost the top bolt while going down the road the other day. It is the one that actully threads into the housing and does not pass through. I think someone at one time tried to replace the bolt for one of the wrong threads and stripped it allowing it to slowly work it's way out. Now I need to try to repair the threads that were once there. The problem is, since I don't have the original correct bolt, I need to be sure exactly what thread and pitch was originally there before going getting a thread repair kit or something.

Anybody know?
Old 02-07-2008, 09:04 PM
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Re: Thread size for tranny torque mount hole?

It's 10mm, std (coarse) thread whatever that pitch is, I forget the #. The normal metric thread in any case. You can get bolts like that hanging in the aisle at AZ. Get the same size Heli-Coil as well, and that should do it.
Old 02-08-2008, 10:53 AM
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Car: 1989 GTA White Hardtop
Engine: L98
Transmission: T-5
Axle/Gears: 9 bolt 3.27
Re: Thread size for tranny torque mount hole?

Does 10 x 1.5 sound right?

I'll have to measure the depth of the hole to figure bolt length I guess.
Old 02-08-2008, 11:09 AM
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Re: Thread size for tranny torque mount hole?

Yes that sounds about right. Passes the "smell test", at least.

Should be about a 40mm length, with a washer head.
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