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Best way to fix buggered up threads in cast tranny cover

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RK

07-08-2002 12:26:47




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The replacement rear cover I bought for my 420W trans. has badly worn threads in the hole for the load & depth control stud. A 5/8 bolt can be threaded all the way thru using just my fingers, but the tops of the threads in casting are flattened out, and the bolt wobbles around when threaded in it. Don't think it will withstand much of a load if left in this condition. So...what's the best fix? (drill it out and go up 1 size, weld it up and re-drill original size, or place a nut on each side of casting) Guess I learned to look over mail order parts a bit closer when received instead of putting them in shop and waiting 4 months to getting around to it.

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Sam

07-08-2002 22:41:56




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 Re: Best way to fix buggered up threads in cast tranny cover in reply to RK, 07-08-2002 12:26:47  
I would recommend a heli-coil, in case you want to remove the stud at some later date. You can get one at an auto parts store or industrial supply house. If you have not used one before, you might consider having a machine shop do the job. The hole has to be drilled and re-tapped, and a special tool is needed to insert the heli-coil. If you decide to do this yourself, make sure your drill follows the original hole. Good luck.

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Henry J

07-08-2002 17:32:48




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 Re: Best way to fix buggered up threads in cast tranny cover in reply to RK, 07-08-2002 12:26:47  
RK

I happen to have one of the rear covers that you describe sitting in the barn. The stud don't wobble in mine so I just put some JB weld around the inside to seal it. Think it may go another 40 some years. If a guy had to fix it right, I would think that you could thread the stud in all the way and weld a bead around the stud on the inside. I just had some welding done on the inside of my transmission case and it came out super. I always take difficult things like this to the experts though. Good luck.

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