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Re: What differential rear end do I have???
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Originally Posted by hotwls13
found it thanks. Page 646. 
So I have a Dana 60?? |
No, you have a GM-12T (12-Bolt Truck) What manual are you guys getting page numbers from? My 72 Service Manual dont have page numbers...? 3/8-16 cover bolts get 35 ft lbs, 5/16-18 get 23 ft lbs, and the 1/4-20 cover bolts get 18 ft lbs. Your GM 12T cover bolts get 23 ft lbs. Make sure the cover mating surface is clean and flat, same for the carrier housing. Use a can or two of Brake Clean to spray the inside of the housing clean, dont forget the drip pan. Check your vent while your under there, a clogged vent will lead to seal leaks. Vents located on the top right of the diff housing. Make sure you place jack stands under the axle before you go to work under there. LeddZepp gave a good method for sealing the cover gasket. The Fel-Pro gasket # for the 12T is RDS 13391. "There is no reason not to use a gasket and several reasons why you should"
__________________
Michael of the clan Hill,
"Two Seventy Two's"
71 1-ton Dually 350 4-Speed
71 C/50 Grain Truck, 350 Split-Axle 4-Speed
02 3/4 ton Express
14 Indian Chief Vintage
1952 Ford 8N, "Only Ford Allowed On The Property"
"Be American, Buy American" 
Last edited by Ironangel; 05-14-2018 at 11:52 PM.
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