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12-01-2003, 04:09 PM
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#1 |
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Registered User
Join Date: Mar 2001
Location: SOUTHERN,CA
Posts: 429
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Rearend Question?
I just bought a 71 5lug rearend yesterday. How can I find out what gear are in it. The numbers on the rearend are NF3896838 on one side and GM61 on the otherside if that helps any.
Thanks, Gabe
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68 CHEVY SWB 95 HARLEY DAVIDSON NOSTALGIA 68 CAMARO CONV 65 CHEVELLE CONV 39 CHEVY CABOVER |
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12-01-2003, 04:20 PM
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#2 |
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Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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pull the cover and look on the ring gear. it`s stamped into the gear. if i remember right, you want the last 4 numbers. mine is a 3.73 and the last 4 were 41-11. then just divide 41 by 11 (in my case) and that will tell you what ratio you have.
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Anthony |
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12-02-2003, 01:36 AM
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#3 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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I agree with pulling the cover. No tellin when that oil was last drained and refilled.
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12-02-2003, 02:05 AM
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#4 |
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My son, my joy.
Join Date: Sep 2003
Location: Spokane WA
Posts: 463
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If you can't find the number, count the teeth on the ring gear, then the pinion and divide the larger number by the smaller.
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12-02-2003, 11:21 AM
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#5 |
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Senior Member
Join Date: Apr 2000
Location: Orlando, FL
Posts: 1,076
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gabe..The numbers you have listed are not the numbers you want. The correct numbers are stamped in the right side axle tube close to the top. Sometimes they are hard to find and you might need a wire brush to clean the area. These numbers will identify what was put in by the factory but it is not always what is in the axle. People change stuff. The best bet is to open it up, get the ring and pinion number off of the ring gear and do a general inspection of everything. Post the numbers if you find them. Somebody here will be able to help.
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............................................................ 68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements. |
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12-03-2003, 04:20 PM
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#6 |
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Registered User
Join Date: Mar 2001
Location: SOUTHERN,CA
Posts: 429
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Vince,
Those numbers are: THCW0181. If that helps. Thanks alot for the replies. 
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68 CHEVY SWB 95 HARLEY DAVIDSON NOSTALGIA 68 CAMARO CONV 65 CHEVELLE CONV 39 CHEVY CABOVER |
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12-03-2003, 07:37 PM
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#7 |
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Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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you need the numbers off the ring gear. it`s the only accurate way to tell what gears are in there.
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Anthony |
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12-03-2003, 10:00 PM
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#8 |
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"Ochre Ogre"
Join Date: Apr 2000
Location: Springfield, MN
Posts: 3,558
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THC for 1971 is a 3.73 axle ratio. Found the info here.
http://www.americanclassic.com/paint_test.asp
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Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087 Last edited by da-burb; 12-03-2003 at 10:02 PM. |
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