My truck has a 400/700r4 and 2.74 rear..which rear to get for economy & peformance - The 1947 - Present Chevrolet & GMC Truck Message Board Network

erikgto · 01-13-2011, 02:58 PM

Hi guys,

Found out that my '86 still has it's original 2.73 peg leg rear.

I will be running 385/40 or 295/40R20's.
Clearly the 2.74 is purely an economy gear and will have the 400 sbc lugging around.

I want to keep economy and relative low highway RPMs in mind, but I do think something like a 3.42 would be way better for performance without hurting my fuel economy.

What would you do, buy a complete used rear (sight unseen over internet) or swap ring and pinion?

01-13-2011, 02:58 PM	#1
erikgto Registered User Join Date: May 2007 Location: The Netherlands Posts: 185	My truck has a 400/700r4 and 2.74 rear..which rear to get for economy & peformance Hi guys, Found out that my '86 still has it's original 2.73 peg leg rear. I will be running 385/40 or 295/40R20's. Clearly the 2.74 is purely an economy gear and will have the 400 sbc lugging around. I want to keep economy and relative low highway RPMs in mind, but I do think something like a 3.42 would be way better for performance without hurting my fuel economy. What would you do, buy a complete used rear (sight unseen over internet) or swap ring and pinion? __________________ 1972 GMC 2500 Sierra 350 1971 Pontiac LeMans Sport 400 GTO/Judge Clone 1970 Pontiac GTO 400 convertible restoproject 1970 Pontiac Bonneville 455 convertible



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