Re: Swapping 4:10 Dana 60 gears to 3:54's
[QUOTE=gmcjuniorvan;76584]If your case number is 30357 (4.10 and down) it will fit.
Where is this case number stamped on the housing just so I can check and be certain before jumping here 
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My 60-66 GMC Projects:
1960 1001 Custom Cab short wideside BBW, 305A V6, factory PB, Hood Jet, Radio and Hydramatic.
1962 K1000 4x4 short wideside, BBW, 305D w/ SM420, PTO Winch
1965 1500 Custom Cab w/ Factory assembly-line installed AC, PS & PB, and rare GMC sliding rear glass
1966 1001 Custom Cab short wideside, w/ 351E, PS, PB, AT, super rare Sport Trim option interior (bucket seats)
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