A question about a bolt size.

What are the dimensions of the bolts,that connect the inspection cover( TH-400) to the TH-400 transmission?

 

3/8 head flange with corse threads 1/2in long

 

Probably 5/16 NC X 1/2" long.. Beware that the 3/4" long ones are for a thicker gasket, and 2 bolts may need to be longer if a floor shifter cable bracket is used... ws

http://www.ebay.com/itm/1967-72-GM-...OS-/400451237767?_trksid=p2141725.m3641.l6368

 

Inspection cover not the pan
Often times you have to use a larger bolt or a longer one because the threads are boogered or tap them for a 5/16 or helicoil to a 1/4

 

My bad! Theyre not 1/4-20s? ws

 

Some were sheet metal screws and some were 1/4 20, not sure why maybe different plant or different years.

Johnny

 

I think SEM is the correct name for them that's whats in the Au ve co catalog anyways, ACE has them in Zinc most the time