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Old 01-29-2018, 09:29 PM   #10
71CHEVYSHORTBED402
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Join Date: Feb 2009
Location: Northern Nevada
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Re: Parts with new transmission mounts (400TH)?

Quote:
Originally Posted by Steeveedee View Post
Good to know. If those threads are beat, the bolts may be a tad too long, allowing them to get against the spacers while the truck was in motion. How do the spacers look, in the holes? Are they marked by threads? Just something to check.
Pretty (*^(*^ smart Steeveedee. I read your post and did my homework. That bolt is what I thought was (still could be) an original bolt. It's 2" from the bottom of the head. The grade 8 undamaged MR. GASKET bolt is 1.7/8".

Anyway, the damaged bolt is 1" longer than the mount and spacers, and yes it was rubbing against one of the spacers. And yes the transmission threads take approx. 7/8", so yes, the bolt is too long. They took lock washers, but the application calls for 1.7/8" bolts, IMO.

Here I was prepared to order new 2" bolts. On second thought, probably have to anyway, scarcity of 1.7/8, but that's what washers are for. Learn something new everyday, appreciate the edgeucation.

EDIT: Thought of another ?.........I wonder what's best GR 5 or GR 8, considering the transmission is just aluminum? Maybe it doesn't matter.
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Tony

71 Custom Deluxe, SWB, 2WD, 402, A/C.

I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

Last edited by 71CHEVYSHORTBED402; 01-29-2018 at 09:40 PM.
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