We just replaced the rear axle of my 1 ton, problem is, we don't know what it is. We thought we got a 3:73 rear end from an '89 3/4 ton Ford passenger van from the local wrecker. Turns out it is a 4:11 GM we think from the number on the ring gear that it is a '91 something. Kind of difficult to get parts when we don't know what it is. We can't find any numbers on the axle (tho, I'm going to look once again). Anyway, the numbers on the ring gear are T or 1 GM 2601(598)21041(5)91. Is there a way to figure out what axle this is by the ring gear number?
