Best rear gearing for my truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LandonL · 11-15-2010, 10:54 PM

The truck is a 1967 GMC Pickup, it has a 250 inline-six with a 3-speed Muncie SM318 trans. I believe the SPID reads 3.54 rear gears.

What would be the best gearing for street and highway, where it would make 65-70 without maxing the RPM's. Thanks!

1968CHEVYC10 · 11-15-2010, 11:00 PM

I think the 3.54's should work really well for a street/highway mix, you could get 3.08's which would do better on the highway, but you be lugging it around town.

11-15-2010, 10:54 PM	#1
LandonL Registered User Join Date: Nov 2009 Location: Georgia Posts: 440	Best rear gearing for my truck The truck is a 1967 GMC Pickup, it has a 250 inline-six with a 3-speed Muncie SM318 trans. I believe the SPID reads 3.54 rear gears. What would be the best gearing for street and highway, where it would make 65-70 without maxing the RPM's. Thanks! __________________ ---\| 1967 GMC Stepside \|-- 250 L6 .030 over ---\| 1985 Porsche 944/1 \|--- Build Thread: '67 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=378640 Last edited by LandonL; 11-15-2010 at 10:54 PM.

11-15-2010, 11:00 PM	#2
1968CHEVYC10 Registered User Join Date: Aug 2009 Location: Tomball, TX Posts: 578	Re: Best rear gearing for my truck I think the 3.54's should work really well for a street/highway mix, you could get 3.08's which would do better on the highway, but you be lugging it around town. __________________ '68 C10 LWB 6.2NA/NP833 3.73's



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