After taking off my tranny a few times I'd like to re-tap the handful of bolt holes that line the upper portion of the block. I'm pretty sure they match a 10mmx1.25 thread pattern but i also wanted to know if anyone knew the size of the six or seven t-case bolts. I know they're a bit bigger, probably 14x1.25 but i want to be sure.

Would it be smarter to re-tap the holes to a different spec and match it with the appropriate bolt or is the iron to hard to re-tap like that? I've only really had experience with aluminum.

Thanks for any help!

 

The transfer case and the transmission it bolts to, are made out of aluminum. I have no idea what the thread pitch is... 12x1.25 or 14x1.25 sounds about right though

 

Yes you're right those parts are aluminum but I'm more concerned with the iron eating up the tap and putting me in an even worse situation.

 

Why are you re-tapping them to begin with? Are they stripped or cross-threaded?

 

The biggest danger is that you'll break the taps..... The best way to do it is to either be very careful with hand tapping or better yet, use a cordless drill to drive the tap if you have room. At any rate, be sure to use appropriate oil....

 

The bolt goes in about 80% at a normal tension then it skips out at the same point and all tension is lost so i'm assuming its cross threaded.

What about using a Helicoil insert?

 

Helicoils are fine. Just be sure to get the proper drill and tap for it and make sure it will be deep enough to accept 1.5 times the diameter of the screw......