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Old 12-15-2006, 11:54 PM   #1
crm318
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rearend fluid question

i was wanting to change my rearend gear fluid this weekend and i was wondering how much fluid it took and what the specifications are on the oil. its a 72 cheyenne with a 12 bolt rear.
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HEI, Curve kit, TH 350, 3.07 gears
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Old 12-16-2006, 02:24 AM   #2
kwmech
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Re: rearend fluid question

Buy 3 quarts, you may have a little extra left over
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Old 12-16-2006, 06:35 AM   #3
JimKshortstep4x4
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Re: rearend fluid question

Capacity of the 12 bolt differential is 3 1/2 pints. 90 gear lube was originally used but there are other lubes available.

Jim
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Old 12-16-2006, 08:39 AM   #4
70GMCer
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Re: rearend fluid question

I bought 2 qts. and had a little left over......
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Old 12-16-2006, 09:44 AM   #5
cdowns
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Re: rearend fluid question

2quarts is more than enough for a 12bolt rear spend the extra and go synthetic // don't over tighten the cover bots only about 10-15ftlbs are required
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Old 12-16-2006, 02:05 PM   #6
crm318
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Re: rearend fluid question

thanks for the info guys. ill get on it this weekend.
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 12-16-2006, 03:14 PM   #7
PanelDeland
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Re: rearend fluid question

crm check to see if it is a limited slip.Someone (hopefully) will chime in and tell you how to tell.Some limited slip rears require a special additive to work.I don't know much about it but I remember seeing some info in a historic post.
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Old 12-16-2006, 03:32 PM   #8
crm318
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Re: rearend fluid question

its an open 3.07. (wish i had a posi though)
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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