Can anyone tell me what size bolts I need to put a transmission inspection cover on a TH400 Tranny? I've been to 4 auto stores and nobody knows. I didn't think it would be that tough to find, but it's like trying to locate hen's teeth.
TIA

 

I leave it off, so I don't know. I figure it just retains heat under there.

Rich Krause

 

And I just bought a chrome one for the bling bling value.

 

I can't believe that NOBODY knows what size these bolts are.

 

I think they were 1/4" coarse when i got mine.. but i'm just guessing. Go to the hardware store and get a bunch of random coarse bolts that look about right and then try em out at home. Since a th400 is so old everything seems to be standard coarse thread.