40 th400 valve body diagram
Guest. ·. #10 · Jan 1, 2007. that is all from a long shaft 72 buick th400, the valve body parts should all be the same as yours, the only change they had was the 67 and older th400's had a switch pitch th400. the pistons and springs in that bore were way down inside, maybe yours are still in there :dunno: Making your own valve body kit. The TH400 doesn't require anything super fancy to get a firm shifting unit. You need to drill the feed holes shown in this picture. I recommend drilling them both to .125". The 3rd feed hole can go bigger, but I would recommend .140" as the high end. You also block the 2-3 accumulator feed hole in the valve body. Step 3: Remove Valve Body. Remove the valve body bolts and remove the valve body from the case. Three of the bolts are 1/4-inch x 20 threads (shown), requiring a 7/16-inch socket. The rest of the bolts are 5/16-inch x 18 threads and require a 1/2-inch socket to remove them. Th400 valve body diagram