ahhhh, I thought I was home free. The tranny is back in after the clutch job but the threads for one of the bolt holes on the tranny for the tranny mount are messed up a bit. I think they were rough before cuz the bolt was hard to get out but now they are definitely in need of help. Anyone with experience on this that can give me some tips

greatly appreciated.

 

one of the holes for the tranny mount busted on me on the th350 so i had to have aluminum added to the case of the tranny and a new hole drilled and heli-coiled, that was 45 bucks at a local small welding shop

you could try a thread chaser, auto parts stores have them

if not then drill out next size up and tap new threads metric or SAE, whichever you want, i opted for 3/8x16 threads for the repaired hole, the other is stock metric still.

3/8"x16 was what they used in the 60s. same size and threads as exhaust bolts waterpump bolts, intake bolts., etc.

good luck

 

ok, I'll try that. Thanks for the tip. I am not looking forward to it but I hope it works out relatively painless!

thanks,
eddie.

 

Get a Heli-Coil kit for the right size bolt, 10mm x 1.5mm I think.

Don't try to rig it, it will come back to bite you sooner or later. Do it the right way, it will be better than new, for all time.

 

Heli-coils rule!

Pete

 

at least you tranny case didnt bust off there at the bolt hole, like mine did

just drill and heli coil and all shoudl be good unless it cracks..

 

RB83L69 - I just borrowed a friends tap and die set and measured the bolt. You are right, it is 10 x 1.5. What is a heli-coil though?? Is this another name for something in a tap and die set??

I can't remember how close to the edge of the tranny that hole is.....but do you think there is a risk of cracking if not careful??

thanks.

 

Just tap it the next size up and buy a bolt to match. The helicoil is more for something that has to stay an exact size and a little bigger bolt won`t hurt anything.

 

mine was heli coiled because thw welder shop guy said that is what he wanted to do with it being aluminum,

i dunno,,

but he did a helluva job, it looks brand new !

helicoil works, you can tighten bolt down, just dont go crazy, just like the welder guy told me. my tranny is installed now, no problems after welding

good luck

 

Until the next time he has his tranny out and that one strips!
I totally agree that you should just helicoil it.

 

again, what is a heli-coil?? Is it different from a tap from a tap and die set??

 

A heli-coil is a product sold at parts stores that is specifically made to repair torn up threads. What you do is tap the hole out to a slightly larger size and screw this little spring-looking thing into it, and the original bolt threads into the spring. It'll hold just as well as it did without the coil, and it'll actually be more resistant to stripping than the aluminum case was. Heli-coils are wonderful things.

 

ok, i definitely haven't seen one of those before then. You are saying that this gizmoo always stays in there?

You said part stores.....would that be auto part stores or a hardware type store??

thanks.

 

Yes once you put it in it's difficult at best to take out, but then again you won't ever need to take it out.

I meant auto parts stores....AutoZone or O'Reilley's for instance. Just get a Heli-coil kit for M10x1.5 threads...it'll come with the tap you need and a couple of coils.

 

ok, thanks for the help!