what rear end do I have - The 1947 - Present Chevrolet & GMC Truck Message Board Network

roughedup72 · 01-20-2006, 01:58 PM

Hey yall, How do I tell what rear end is in my truck? I'm almost poitive it's not a posi unit,and it is a 12 bolt.

thejoker · 01-20-2006, 02:34 PM

what rear end do I have

Boy....wasn't sure what I was in for when loading your thread!

Try this page. http://www.drivetrain.com/GMtrkratio_posidata.html

JKR

roughedup72 · 01-20-2006, 03:10 PM

Yeah I guess I should have clarified that as to what rear end is in my truck,,,,Naa that could be misleading also, maybe what gears do I have would be better.

Longhorn Man · 01-20-2006, 03:49 PM

if is is a small block with an auto, it'll be a 3.07 onless chainged out or otherwise listed on the SPID label.
Popping the cover off and counting the teeth is a good way to see what you have, the condition it is in, and replacing the oil since it is of minimal value after so long.

carl609 · 01-20-2006, 09:56 PM

before you go nuts counting teeth, spin the ring gear around and look for a bunch of stamped numbers. if it is a GM gearset it will have the tooth count stamped on. 41-10=4.10, 41-11=3.73 etc, just divide the two.

roughedup72 · 01-20-2006, 10:05 PM

Quote:

Originally Posted by carl609

before you go nuts counting teeth, spin the ring gear around and look for a bunch of stamped numbers. if it is a GM gearset it will have the tooth count stamped on. 41-10=4.10, 41-11=3.73 etc, just divide the two.

thanks for the tip.

01-20-2006, 01:58 PM	#1
roughedup72 Senior Member Join Date: Oct 2005 Location: south carolina Posts: 658	what rear end do I have Hey yall, How do I tell what rear end is in my truck? I'm almost poitive it's not a posi unit,and it is a 12 bolt. __________________ 1972 chevy cheyenne 10,nothing special at the moment,Its a work in progress, Working on the engine, paint and body,engine, paint and body,now its the suspenion, ahh hell I'm about tired of working on it. Maybe it will be a rat rod.

01-20-2006, 02:34 PM	#2
thejoker Registered User Join Date: Jun 2005 Location: Gulfport Mississippi Posts: 364	Re: what rear end do I have *what rear end do I have* Boy....wasn't sure what I was in for when loading your thread! Try this page. http://www.drivetrain.com/GMtrkratio_posidata.html JKR __________________ **Have you ever danced with the devil in the pale moonlight....I ask that of all my prey** 68' C10 Short Step (rebuilding as we speak) 72' Custom Camper (wrecked, parting out) 79' C10 Fleet (rough, parting out) 97' C1500 Short Step Custom (DD) 97' Kawaski VN800a Customized 99' Z71 Silverado 04' Suzuki Volusia

01-20-2006, 03:10 PM	#3
roughedup72 Senior Member Join Date: Oct 2005 Location: south carolina Posts: 658	Re: what rear end do I have Yeah I guess I should have clarified that as to what rear end is in my truck,,,,Naa that could be misleading also, maybe what gears do I have would be better. __________________ 1972 chevy cheyenne 10,nothing special at the moment,Its a work in progress, Working on the engine, paint and body,engine, paint and body,now its the suspenion, ahh hell I'm about tired of working on it. Maybe it will be a rat rod.

01-20-2006, 03:49 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: what rear end do I have if is is a small block with an auto, it'll be a 3.07 onless chainged out or otherwise listed on the SPID label. Popping the cover off and counting the teeth is a good way to see what you have, the condition it is in, and replacing the oil since it is of minimal value after so long.

01-20-2006, 09:56 PM	#5
carl609 Registered User Join Date: Jan 2006 Location: Lynnwood, WA Posts: 63	Re: what rear end do I have before you go nuts counting teeth, spin the ring gear around and look for a bunch of stamped numbers. if it is a GM gearset it will have the tooth count stamped on. 41-10=4.10, 41-11=3.73 etc, just divide the two. Last edited by carl609; 01-20-2006 at 09:57 PM.



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