1981 k30 axle question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1979k20 · 07-11-2021, 11:28 PM

I have a 1981 k30 dually with 454, turbo 400, Dana 60 front and I think a Dana 70 rear axle. I found out that it has 4:56 gears but I wound rather have 3:73’s. Is it possible to put 3:73 gears on the 4:56 carrier? Is there anything else that I’m overlooking? Or am I better off finding a different set of axles? Thanks for any and all help.

dieseldawg142 · 07-11-2021, 11:55 PM

i belive the carrier break is the same as a 14b, 4:10 and down and 4:56 and up

**kwmech** · 07-12-2021, 12:52 AM

Yup, carrier break for both axles is 4.56.

I'd be interested in the axles if for sale

bigdaddy4x4 · 07-12-2021, 07:16 PM

i would leave them alone either gear will still suck up the fuel

07-11-2021, 11:28 PM	#1
1979k20 Registered User Join Date: Oct 2017 Location: Bowman ND Posts: 2	1981 k30 axle question I have a 1981 k30 dually with 454, turbo 400, Dana 60 front and I think a Dana 70 rear axle. I found out that it has 4:56 gears but I wound rather have 3:73’s. Is it possible to put 3:73 gears on the 4:56 carrier? Is there anything else that I’m overlooking? Or am I better off finding a different set of axles? Thanks for any and all help.

07-11-2021, 11:55 PM	#2
dieseldawg142 Registered User Join Date: Jul 2011 Location: back 40, bc Posts: 3,906	Re: 1981 k30 axle question i belive the carrier break is the same as a 14b, 4:10 and down and 4:56 and up

07-12-2021, 12:52 AM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,634	Re: 1981 k30 axle question Yup, carrier break for both axles is 4.56. I'd be interested in the axles if for sale

07-12-2021, 07:16 PM	#4
bigdaddy4x4 Registered User Join Date: Aug 2012 Location: concord ga Posts: 188	Re: 1981 k30 axle question i would leave them alone either gear will still suck up the fuel



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