Quick rearend question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**68 Stepside** · 08-16-2003, 10:13 PM

Howdy,

I've got a ring and pinion out of a 76? GMC Sierra Grande. It's either a 2.76 or a 2.67. I'm almost positive it's a 2.76...does that sound right?

Thanks for anything.

*mike reeh* · 08-16-2003, 10:35 PM

no that doesnt sound right.. divide the teeth on the big gear by the number of teeth on the little gear...

I dont think any trucks in that era came with 2.73 but that would be the closest to what you said..

The number of teeth should also be stamped on the side of the ring gear (the big one) like "41 10" which would be 4.10:1

let me know what it ends up being..

mike

**68 Stepside** · 08-16-2003, 10:59 PM

I'll go look now, it's right outside...thanks Mike.

*gmtrucksaddict* · 08-31-2003, 02:38 PM

2.76 is 12 bolt
2.73 is 10 bolt

2.76 is correct

same with 3.40 and 3.42

3.42 is 10 bolt and 3.40 was 12bolt

notmany ppl know rear axles apparently ?

Nvbowtie · 08-31-2003, 04:03 PM

Quote:

Originally posted by gmtrucksaddict
2.76 is 12 bolt
2.73 is 10 bolt
2.76 is correct
same with 3.40 and 3.42
3.42 is 10 bolt and 3.40 was 12bolt
notmany ppl know rear axles apparently ?

>gmtrucksaddict

That's interesting info where is the source so I can look that up ? I am a info junkie I guess you might say

*gmtrucksaddict* · 08-31-2003, 04:17 PM

you learn this infowhen you take so many trucks and axles apart

2.76 is 12 bolt truck ratio,

2.73 is in the 10bolts 8.5"

08-16-2003, 10:13 PM	#1
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	Quick rearend question Howdy, I've got a ring and pinion out of a 76? GMC Sierra Grande. It's either a 2.76 or a 2.67. I'm almost positive it's a 2.76...does that sound right? Thanks for anything. __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

08-16-2003, 10:59 PM	#3
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	I'll go look now, it's right outside...thanks Mike. __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

08-16-2003, 10:35 PM	#2
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 684	no that doesnt sound right.. divide the teeth on the big gear by the number of teeth on the little gear... I dont think any trucks in that era came with 2.73 but that would be the closest to what you said.. The number of teeth should also be stamped on the side of the ring gear (the big one) like "41 10" which would be 4.10:1 let me know what it ends up being.. mike

08-31-2003, 02:38 PM	#4
gmtrucksaddict Account Suspended Join Date: Aug 2003 Location: IL Posts: 60	2.76 is 12 bolt 2.73 is 10 bolt 2.76 is correct same with 3.40 and 3.42 3.42 is 10 bolt and 3.40 was 12bolt notmany ppl know rear axles apparently ?

08-31-2003, 04:17 PM	#6
gmtrucksaddict Account Suspended Join Date: Aug 2003 Location: IL Posts: 60	you learn this infowhen you take so many trucks and axles apart 2.76 is 12 bolt truck ratio, 2.73 is in the 10bolts 8.5"



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