I had ordered a counter gear assembly off of eBay for my 1953 chevy 1/2 ton with a 318 3 speed tranny....When I received the gear the gear measurements were Slightly different even tho the tooth count was the same and the teeth seem to line up.
The thickness of the gear at the end of the assembly on my old one measured 0.667 and the new one measures 0.590.
The length of the assembly is correct and the countershaft is correct.
Were truck 318 and car 318 tranny the same ?
It looks like the counter gear assembly would fit but what about the effect of the thinner gear.
I am now waiting for the authorization to return the gear, but before I do I want to hear opinions. ....

1953 chevy 1/2 ton with 3 speed 318 on floor and 1955 235 engine