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the 4.10 and 4.56 were all that was available for the dana 60 rearend in 4x4s, BB 3/4 tons had 3.42 gears.
the eaton ho52, which he is talking about, had 4.11, 4.57, and 5.14 from the factory. however, 3.90 was aftermarket...and was/is the only one made.
dana 60's have a lot of aftermarket gears available. i have the same setup as you...d44/d60...originally 4.10s, but the p/o swapped them out for 3.73, which helps wth gas mileage. i am not sure of all the others, but I know Ford had a 3.54 available in 4x4 d60's.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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