67 Chev 12 bolt differential - The 1947 - Present Chevrolet & GMC Truck Message Board Network

80ids · 03-26-2016, 01:26 PM

My 67 C10 currently has 3.73 rear gears, has a 250 inline 6 and 3 on the tree. Looking to change the rear gears to lower rpm at higher speed. I'm told if I go lower than 3.55 I have to change the carrier also. Anybody have any knowledge of this?

Thanks...

Redline novdog · 03-26-2016, 02:12 PM

I'm sure someone will correct me if I'm wrong ,but sounds correct. My '67 12 bolt has 3.08 gears. I can only go up to 3.42 ratio.
I believe there are 2/3/and 4 series carriers?!

Mrturner1 · 03-26-2016, 02:51 PM

Quote:

Originally Posted by 80ids

My 67 C10 currently has 3.73 rear gears, has a 250 inline 6 and 3 on the tree. Looking to change the rear gears to lower rpm at higher speed. I'm told if I go lower than 3.55 I have to change the carrier also. Anybody have any knowledge of this?

Thanks...

I wish you lived closer, we could just swap rear ends and save each other a boatload of money haha. There are different series of carrier, and if I remember right 3.73 is the tallest gear for its carrier but somebody will chime in that has more experience

Redline novdog · 03-26-2016, 04:13 PM

https://www.ringpinion.com/b2c/DiffD...&DriveType=RWD
This site should give you some answers.there are a ton of these rearends out there so don't give up hope.

03-26-2016, 01:26 PM	#1
80ids Registered User Join Date: Oct 2015 Location: Hamilton, ON Posts: 16	67 Chev 12 bolt differential My 67 C10 currently has 3.73 rear gears, has a 250 inline 6 and 3 on the tree. Looking to change the rear gears to lower rpm at higher speed. I'm told if I go lower than 3.55 I have to change the carrier also. Anybody have any knowledge of this? Thanks... __________________ 1967 Chev C10 Short Box Step Side 250 CID 3 on the tree Owner/Operator at Upper Gage Garage

03-26-2016, 02:12 PM	#2
Redline novdog Registered User Join Date: Jan 2012 Location: Washington,Il Posts: 632	Re: 67 Chev 12 bolt differential I'm sure someone will correct me if I'm wrong ,but sounds correct. My '67 12 bolt has 3.08 gears. I can only go up to 3.42 ratio. I believe there are 2/3/and 4 series carriers?! __________________ It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS

03-26-2016, 04:13 PM	#4
Redline novdog Registered User Join Date: Jan 2012 Location: Washington,Il Posts: 632	Re: 67 Chev 12 bolt differential https://www.ringpinion.com/b2c/DiffD...&DriveType=RWD This site should give you some answers.there are a ton of these rearends out there so don't give up hope. __________________ It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS



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