Stripped Trans Mount TH400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1985GMC · 06-11-2015, 03:19 PM

1985 GMC, 350ci, THM475, Auto, 4WD.

I replaced the rotted snapped in half trans mount on my truck recently. As I installed the new trans mount with new hardware I accidentally stripped the threading on the Trans side. The Trans mount has two flanges on the top that line up with two threaded holes in the Trans. Now this problem may have been done prior, the previous owners were silly farmers and did a bunch of similar damage.

Regardless, how should I approach this issue? Currently only one bolt is torque into the Trans.

Thanks.

GRADYS Performance · 06-11-2015, 07:24 PM

Helicoil the bolt holes. They could be 7/16-14 or 10MM x 1.5 depending on the year of the trans.

06-11-2015, 03:19 PM	#1
1985GMC Registered User Join Date: Nov 2012 Location: Morris, ct Posts: 54	Stripped Trans Mount TH400 1985 GMC, 350ci, THM475, Auto, 4WD. I replaced the rotted snapped in half trans mount on my truck recently. As I installed the new trans mount with new hardware I accidentally stripped the threading on the Trans side. The Trans mount has two flanges on the top that line up with two threaded holes in the Trans. Now this problem may have been done prior, the previous owners were silly farmers and did a bunch of similar damage. Regardless, how should I approach this issue? Currently only one bolt is torque into the Trans. Thanks.

06-11-2015, 07:24 PM	#2
GRADYS Performance Registered User Join Date: Dec 2013 Location: Columbus, Oh Posts: 367	Re: Stripped Trans Mount TH400 Helicoil the bolt holes. They could be 7/16-14 or 10MM x 1.5 depending on the year of the trans.

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