Thread: Need Chevy Guys Help On Tranny Id

Tweet

Great. The trans looks really good, and the price was right. I'll pull the side cover when I get to that point in the build and make sure the gears look ok, but a quick spin through the gears last night seemed like it was usable.

I will count the teeth on the marine flywheel that is on there now, that should give me some idea of how many I will need on a regular stick flywheel.

Only thing I am still a little confused on is the external/ internal balance thing.

Thanks again, Don

>Only thing I am still a little confused on is the external/ internal balance thing.

The balance thing was touched on, but I'll try to help. Before the one piece rear seal on small blocks, the 350 used a zero balance flywheel as the engine was internally balanced. Look at the crank flywheel flange on a pre-'86 350 and you'll see it's not round, but has an eccentric shape that was part of the rotating mass used in balancing. When they went to a one piece seal, the crank flange had to be round so the seal could slip over it. As a result, the eccentric mass that was on the flange of the old crank was transfered to the flywheel, thus the engine became externally balanced. So, you need a flywheel for the one piece seal crank. The earlier flywheel won't fit anyway.

Bob

The number is 3743368, and it's a 58-63 Saganaw three speed. That particular number is the case part number. They came in a six cylinder, and wide and close ratio for V-8s. It looks like the six cylinder input shaft has a different spline than the V-8.

http://www.1955-75chevyautoparts.com...ansmission.pdf

Classic Muscle could probably help when you start to buy the clutch and flywheel.

http://www.oldmusclecars.com/

Another very good piece of the Chevy puzzle. I am going to have to pull the front off and see if the shaft is a 6 cyl or not.

Thanks,

Don