Whats up with 3.07's??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BurnoutNova · 03-25-2004, 03:46 AM

i broke my gears, and need a set of 3.07 gears...sooo, i call up summit, they tell me there is no 3.07, and 3.08's will work even if my front gears are 3.07. i said hell no. jegs says the same thing.

aparrantly richmond doesnt offer a 3.07 gear for a 71 K-10 1/2 ton ???

WHERE do i get some, i would prefer a good gear becaus its the tow vehicle for my drag car. and i'll be towing it to the track all summer

thanks, zach

1969 GMC · 03-25-2004, 04:58 AM

it is ok to run 3.07 in one axle and 3.08 in the other. the small difference won't matter, even when in 4wd on pavement. some trucks came from the factory this way, with the front and rear ratio not matching exactly.

67-72williso · 03-28-2004, 11:20 AM

3.07 front and 3.08 rear will work just fine. A lot of factory stuff is off by one click like that.

Later Wilis

SWEET7T · 03-28-2004, 04:11 PM

They will work. The difference in ratio is soooo small, you will never notice it.

BurnoutNova · 03-28-2004, 06:54 PM

well i ordered 3.07's today from the parts store. i didnt want to take a chance with 3.08's and find out they wont work.

68K10Custom · 04-06-2004, 09:32 PM

I changed the front and rear ring/pinions (Dana 44 and GM 12 bolt) from 3.73 to "3.07s" on my 68 K10 using parts from Randy's Ring and Pinion for a competitive price. Think these were Yukon brand parts.

The number mismatch won't be appreciable since tread wear and tire inflation differences account for a much larger percentage of "mismatch."

Usually people aren't driving on dry pavement anyhow.

03-25-2004, 03:46 AM	#1
BurnoutNova Registered User Join Date: Mar 2004 Location: CA Posts: 2,057	Whats up with 3.07's??? i broke my gears, and need a set of 3.07 gears...sooo, i call up summit, they tell me there is no 3.07, and 3.08's will work even if my front gears are 3.07. i said hell no. jegs says the same thing. aparrantly richmond doesnt offer a 3.07 gear for a 71 K-10 1/2 ton ??? WHERE do i get some, i would prefer a good gear becaus its the tow vehicle for my drag car. and i'll be towing it to the track all summer thanks, zach

03-25-2004, 04:58 AM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	it is ok to run 3.07 in one axle and 3.08 in the other. the small difference won't matter, even when in 4wd on pavement. some trucks came from the factory this way, with the front and rear ratio not matching exactly. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

03-28-2004, 11:20 AM	#3
67-72williso Junk/Daily Driver Club Join Date: Feb 2004 Location: Manheim, PA 17545 Posts: 253	3.07 front and 3.08 rear will work just fine. A lot of factory stuff is off by one click like that. Later Wilis __________________ Daily Driver: 1970 C-20 400 sbc,sm-465,Dana 61 one ton SRW rear, 3.07 gears, locker. There are three kinds of people: those who make things happen, those who watch things happen, and those who have no idea what happened!

03-28-2004, 04:11 PM	#4
SWEET7T Try spinnin 4 rear tars Join Date: Sep 2003 Location: Salt Lake City, Utah Posts: 757	They will work. The difference in ratio is soooo small, you will never notice it. __________________ SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB

03-28-2004, 06:54 PM	#5
BurnoutNova Registered User Join Date: Mar 2004 Location: CA Posts: 2,057	well i ordered 3.07's today from the parts store. i didnt want to take a chance with 3.08's and find out they wont work.

04-06-2004, 09:32 PM	#6
68K10Custom Registered User Join Date: Apr 2004 Location: Minneapolis, MN Posts: 3	I changed the front and rear ring/pinions (Dana 44 and GM 12 bolt) from 3.73 to "3.07s" on my 68 K10 using parts from Randy's Ring and Pinion for a competitive price. Think these were Yukon brand parts. The number mismatch won't be appreciable since tread wear and tire inflation differences account for a much larger percentage of "mismatch." Usually people aren't driving on dry pavement anyhow.



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