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09-04-2003, 08:45 AM
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#1 |
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Registered User
Join Date: Aug 2003
Location: illinois
Posts: 21
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What type of differential do i have?
i am trying to find out what type of differential i have in my truck. i have a 71' GMC C-2500. it is 3/4 ton full floating rear end. this is all i know. it is original and i want to change the rear gears so it is more streetable. the truck is 2wd. i was once told it is probably a dana 60 and someone else said it was a GM 12 bolt. i don't know anything about differentials and need help finding out what rear end i have before i try to order new gears.
thanks for any help! ronniej 
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09-04-2003, 09:22 AM
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#2 |
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Registered User
Join Date: Dec 2001
Location: New Richmond, WI
Posts: 547
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If it has a round cover on the back with a drop out differential assembly it's an Eaton HO72. If it has a non-round cover with a drain plug in the cover it is a Dana 60.
I think those are the only options for a 3/4 ton, but I don't know for sure.
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Eric 1969 K20, 465/205 package |
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09-04-2003, 09:24 AM
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#3 |
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user # 2756
 
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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Does it look like my avatar pic? If so it's a dana60. If it has a round cover and drop out center section it's a corperate axle. More likely the dana 60.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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09-04-2003, 09:27 AM
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#4 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Try this link. You can compare the pictures with what you have.
Jim http://www.coloradok5.com/axleguide.shtml |
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09-04-2003, 09:33 AM
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#5 |
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Registered User
Join Date: Aug 2003
Location: illinois
Posts: 21
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looks like it is a dana 60. now, how do i find out what gears it has in it?
thanks for the info! ronniej
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09-04-2003, 10:34 AM
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#6 |
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Gotta Startem Early
Join Date: Oct 2001
Location: Amarillo, TX, USA
Posts: 364
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drop the cover, count the teeth on both pinion and the ring and then divide the pinion into the ring. You could probably use new oil anyway.
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67 SWB In Progress, one piece at a time, maybe 3 years I will be finished |
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09-04-2003, 11:40 AM
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#7 |
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Registered User
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 2,999
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usually if no one has messed with your diff before, there should be a tag on one of the lower cover bolts that says the ratio and the number of teeth on each gear. I've seen quite a few and have a couple so they may be a good chance yours is still on there.
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09-04-2003, 12:31 PM
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#8 |
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Registered User
Join Date: Jan 2002
Location: Sahuarita, AZ USA
Posts: 2,033
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Never saw a tag on one, except on F&%d 8 inch and 9 inch. I have one with a 14 bolt cover. Was told the only gears available are 390, 411 and 456. Was further told to find one from 73 up with 8 lugs and it can be modified to work with my leaf spring Longhorn.
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Bill - Tucson, AZ 47 Chevrolet 2 dr sedan 56 Chevrolet 210 2 dr sedan 66 Chevrolet Malibu 2 dr 4 speed 71 Chevrolet C30 Longhorn 86 Chevrolet Monte Carlo SS (Sold) 01 Chevrolet Tahoe IM - BUSTERWIVE@aol.com |
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