I was wondering what my rear end in my 66 Chevy C20 had for gearing. It had the 250 CID 6 banger and the 4 speed.
Is there a website or something out there that'd tell me what ratio the rear end has in it?

Also how do I know which 4 speed is in my pickup, there were different ones offered right?
It came from the factory with the #M20CL option which was the 4 speed tranny.

Or is there something on the pickup itself that'll tell me these things?
All I've found is the VIN Plate in the door and the plate on the drivers kick panel with the paint code & GVW.
Thanks.