Swapping 4.56 for 3.73 ratios - The 1947 - Present Chevrolet & GMC Truck Message Board Network

M1031 · 06-06-2009, 11:07 AM

Hi all!

I'm looking to increase my top end on my M1031 by swapping the ratios (45mph in TX bites w/the Mexicans doing 70+). I know I need the carrier bearing (front & rear) as well as the gears themselves. What other parts do I need to swap?

Thanks in advance.

Me.

rangerfj40 · 06-06-2009, 12:57 PM

Get an install kit front and rear. Will have everything you need, minus R&P. Might have to but additional shims to get preload correct.

1972GMCBOGGER · 09-17-2012, 06:58 PM

Have 3.55 carrier for a Dana 60, depending on your rear diff depends if to need a carrier swap. Carrier breaks are typically 4.10/4.56
Posted via Mobile Device

06-06-2009, 11:07 AM	#1
M1031 Registered User Join Date: Jun 2009 Location: Houston, TX Posts: 3	Swapping 4.56 for 3.73 ratios Hi all! I'm looking to increase my top end on my M1031 by swapping the ratios (45mph in TX bites w/the Mexicans doing 70+). I know I need the carrier bearing (front & rear) as well as the gears themselves. What other parts do I need to swap? Thanks in advance. Me. Last edited by M1031; 06-06-2009 at 11:09 AM. Reason: Forgot details

06-06-2009, 12:57 PM	#2
rangerfj40 Registered User Join Date: Feb 2009 Location: Mountain Home, Idaho Posts: 19	Re: Swapping 4.56 for 3.73 ratios Get an install kit front and rear. Will have everything you need, minus R&P. Might have to but additional shims to get preload correct.

09-17-2012, 06:58 PM	#3
1972GMCBOGGER Registered User Join Date: Sep 2012 Location: Fort St.John B.C Posts: 18	Re: Swapping 4.56 for 3.73 ratios Have 3.55 carrier for a Dana 60, depending on your rear diff depends if to need a carrier swap. Carrier breaks are typically 4.10/4.56 Posted via Mobile Device



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.