Because you can drop it out like that it is an Eaton. 4.10 is the best you can do unless you buy new gears. They make a 3.90 for it. Somebody on the board did this. If I remember right, it was over a $1000 to do! It would be worth the time to find a 14 bolt and change it over to fit your truck. I think 3.73's are pretty common.
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1971 C-10 Suburban (Ochre)
1971 K-10 Suburban (Ochre)
1972 C-10 Suburban (Ochre)
1972 K-20 Suburban (Yellow- that just aint right!)
Springfield, Minnesota 56087
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