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Discussion Starter · #1 ·
i'm switching a 3 speed out for a 4 speed in my el camino, and the bolts for the trans mount won't fit in my new trans. the bolt hole is just bigger than a 3/8, but a 10mm course won't fit either. any ideas?
 

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Shop Owner And Troll Hunter
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2,643 Posts
Gm trans. mounts are 7/16 standard thread, until they went to metric.

Troy
 

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Discussion Starter · #5 ·
threads

so after trying a bazzillion bolts that i had in the backyard, i realized the threads in the trans were flattened. i'm guessing whoever had it before me put a 3/8 bolt in and it bounced around and destroyed them. so i threw a 10 x 1.5 (i should have just done it to begin with) and it is working fine. i was this || close to drilling it and tapping a 7/16.
 

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good to read you have it fixed.

generally if the 10mm bolt hole is buggered up, a 7/16 tap will thread in and cut new threads easily.

I use STP as a lube for cuttin the threads
 
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