3.07's out and 3.73's in? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dingo_dan_22 · 02-03-2008, 05:08 AM

Can I swap the gears and carrier out of a 67' axle with 3.73's into a 71' axle originally equipped with 3.07's.

My truck is the 71' and I'd like to keep it 5 lug in the back. I'm having someone install a posi in the rear for the 3.73's. The conversion axles for the 67' would kill me for shipping and to redrill the axles would cost about the same.

jrdv · 02-03-2008, 08:31 AM

I had a shop change out the gears in my swb 71 c-10 a few years ago. It originally had the 3.07's and they told me I could only go to 3.42's due to the size of the carrier. Thats all I know--maybe someone else will have more.

john

**twotrucks** · 02-03-2008, 08:40 AM

If you are changing the gears and carrier then yes. Like stated before, the carrier will dictate the gear set that can be used.

02-03-2008, 05:08 AM	#1
dingo_dan_22 Registered User Join Date: Dec 2006 Location: Saskatchewan Posts: 119	3.07's out and 3.73's in? Can I swap the gears and carrier out of a 67' axle with 3.73's into a 71' axle originally equipped with 3.07's. My truck is the 71' and I'd like to keep it 5 lug in the back. I'm having someone install a posi in the rear for the 3.73's. The conversion axles for the 67' would kill me for shipping and to redrill the axles would cost about the same. __________________ 71' Chevrolet -> 350c.i. w/ 600 Edelbrock Carb, Headers, P/S, 3/5 Drop

02-03-2008, 08:31 AM	#2
jrdv Registered User Join Date: Apr 2000 Location: new mexico Posts: 948	Re: 3.07's out and 3.73's in? I had a shop change out the gears in my swb 71 c-10 a few years ago. It originally had the 3.07's and they told me I could only go to 3.42's due to the size of the carrier. Thats all I know--maybe someone else will have more. john __________________ 1972 3/4T 4x4 Chevrolet (383) 1971 c-10 SWB (400 sb) 1972 4x4 Blazer 1969 SWB 4x4 GMC Projects: 1972 stepside 4x4 http://67-72chevytrucks.com/vboard/s...d.php?t=280132 http://67-72chevytrucks.com/vboard/s...d.php?t=285952 http://67-72chevytrucks.com/vboard/s...d.php?t=553672 http://67-72chevytrucks.com/vboard/s...d.php?t=522704

02-03-2008, 08:40 AM	#3
twotrucks Junior Member Join Date: Jun 2003 Location: Louisville,Ky Posts: 383	Re: 3.07's out and 3.73's in? If you are changing the gears and carrier then yes. Like stated before, the carrier will dictate the gear set that can be used.

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