Most diesel trucks round these parts run a 3.73 to 4.30 rear end depending on the transmission. I had a 3/4 Chevy with an Allison transmission on the Duramax and it had a 4.30 Rear End. It would pull an 23 foot travel trailer loaded with gear AND a 21 foot flairstack (can pull two trailers here). Top speed was about 80 MPH empty if i recall. It didnt even hit the governor. But I wouldn't recommend that truck to my enemies.
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