64c20crewcab
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Take your time, but HURRY UP!!!
Posts: 32
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Post by 64c20crewcab on Mar 30, 2008 21:58:43 GMT -7
OK I got this rearend out of a 66 C10. It has numbers on the case:GM15,3856525 with a N above it and the Vin# is C154 - 6Z137529. I know american classic has the decoder but can these numbers tell me the ratio of the rearend without removing the cover?
thanks!
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Post by b143more on Apr 2, 2008 21:32:51 GMT -7
I haven't been on here in quiet awhile but let me see if this will help you.
REAR AXLE IDENTIFICATION:
The production code number contains prefix letters and production date numbers. Axle identification is stamped on the differential carrier along with the date of manufacture.
Example: HB 0612 HB = 3.07:1 ratio, O6 = month built (June), 12 = day built(12th)
If your rearend came out from under a 66 C10, that tells me its a 1/2 ton truck and there are only three factory gear ratios for a 1/2 ton pickup, 3.07:1, 3.73:1 and 4.11:1. Here are the codes for each one.
JQ-4.11:1 HF-3.73:1 These are the only codes my book uses for 66 rearends
HA-3.73:1 HG-3.73:1
HB-3.07:1 HH-4.11:1
HC-3.73:1 HQ-3.73:1
HD-4.11:1
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Post by riverracer on Apr 4, 2008 20:36:09 GMT -7
Any numbers you find will be as it was delivered from the factory, gears could have been changed thru the years!..
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64c20crewcab
New Member
Take your time, but HURRY UP!!!
Posts: 32
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Post by 64c20crewcab on Apr 6, 2008 17:43:04 GMT -7
Thanks! Now these numbers i posted are were the vin as well as numbers found on the housing of this 12 bolt. The numbers supplied by Billy dont match what I posted. I need to remove the cover to see these numbers??
Thanks Guys!!
N
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Post by flatblack60 on Jun 14, 2008 19:08:25 GMT -7
hopefully you haven't cracked it open yet. the easiest way to check gear ratios is to jack up one side of your rear end and with the transmission in neutral spin the tire thats in the air. now count how many times the u-joint on your rear end spins for one revolution of the tire. about 3 and 3/4 times = 3.73 just over four times = 4.11 this should get you right.
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zor
New Member
Posts: 45
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Post by zor on Jun 15, 2008 11:23:04 GMT -7
How do you identify whether or not you have a posi? This is my first chevy (I've had plenty of fords) and I really don't know alot about them.
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64c20crewcab
New Member
Take your time, but HURRY UP!!!
Posts: 32
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Post by 64c20crewcab on Jun 22, 2008 22:30:54 GMT -7
zor, just jack up the rearend / get both rear wheels off the ground. with tranny in neutral, spin one of the rear wheels. if they both spin forward you got a posi.
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anyone know if its possible to turn my c10 into 4x4 ?