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I don't want to be that guy but you could just pop the cover and look at the stamping on the ring gear and do the math. If your truck is like mine its probably due for a rear end oil change anyway.
It was just a thought. Not saying that your one of them but Ive known people that dont know that they should change the oil in there let alone know that there is oil in there.Unfortunately I just did the diff fluid about 2 weeks ago. I'm trying to find a cam rpm that will work with the gears in it. The ring and pinion looked perfect, but I was hoping for 4.10 gears. Once I get home I'm gonna recount in multiple of tens.
Now you know you have 373s.So I went outside. Jacked up one side of the trucks axle. Ten turns to the wheel. Pinion turned 18.65 times.
So 18.65 pinion rotations ÷ 10 tire rotations = 1.865
1.865 x 2 (for each side of axle I guess) = 3.73
So I have 3.73 gears.
Should of looked while I had the cover off......oh well.
Funny, I actually sought out a 3.42 for the wife's truck. Had 3.08's and my truck has 3.73's. We're both very happy with the 3.42 G80 rear end we swapped in a few weeks back. It's better in the city and still good on the expressway. Even she can feel the difference when left in gear and opening it up a bit, moves a lot better and downshifts aren't necessary. ('92 C1500 reg cab long box, 350 five speed)3:73s still aren't a bad gear ratio, good thing you don't have 3:42s lol.