Threaded studs for T20 mounting

[tonyk72]

One of my threaded studs is beat up on the nut side. I managed to pull the whole stud out without damaging the case but I'm having a tough time finding replacement studs locally. It looks like Grainger has them, part # 5LNX1, but it'll cost me $15 total to get them shipped.
For now I have a bolt in it's place, but it's about 1.5 inches long, so it's not snug. Can I just use a 1" 16 3/8 bolt - maybe a grade 3 or 5?
I've read about people getting their studs/bolts sheared right off. I want to make sure I don't have to deal with that...

[mike454]

I'd say you will be fine with a bolt,if you can't come up with a stud...but i'd get a grade 8 and use either blue or red lock~tite.
Just Make sure you tighten it to the proper torque,I think most of the time when T-20 mount studs are sheared off it's caused by being loose,then the added pressure off the entire transmission shifting in the mounts under extreme loads is what shears the studs.
It would be hard to break studs off when the nuts are all tight against the mount,there are other weaker points that would give way before the studs.....just my .02
Grade 8 may be a little overkill,but for .50-1.00 more for a grade 8 bolt it sure won't hurt,although the harder the metal,the more brittle it is also.
Maybe someone that works with the T-20's a lot can chime in on the recomended grade for the trans mounting studs,i think i remember one of the other mikes posting something about it.Whipper should know,he is an expert in the field of metal and machining....
but to answer your question the Bolt Will work,but i'd say the stud will hold better,and with the red loctite should'nt loosen up

[Tomo]

HI,
Stud for T20 is ,thread 3/8 UNC inside transmission housing and 3/8 UNF on the outside of the transmission ,length of your choice .
Stud mount is always better than a bolt in this situation eg a nut/stud arrangement will always give a greater clamping force for the same tension applied to a bolt . A comparison would be the reason why engine cylinder heads use studs instead of the traditional method of bolts .

If u have nuts that come loose on either studs or bolts even trying all alternatives try a product called ""NORD LOCK WASHERS ""They work far better than any split type washer .

tomo
cheers