Overdrive vs Ring & Pinion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hgs_notes · 10-18-2005, 12:41 AM

I was thinking the other day, yeah it hurt, that just changing the ring and pinion so the final drive ratio would be the same as if you kept the original gears but installed an OD tranny would be a pretty cheap and easy way to save fuel. I know you would lose the low end power and this is not a fix all thing, but for the many people here that are using the truck as a driver it should work.

If you have a 4 speed manual tranny now, the effect would be similar as having an OD automatic. The 3 speed would pull a bit slower to speed maybe. You can get as low as a 2.56 or 2.73 ring and pinion set I think for our axles. If you had 3.73's originally that would be .73 OD for the 2.73 gears and .68 OD using the 2.56 gears.

I'm done thinking now. Go about your business.
HG

krue · 10-18-2005, 04:34 AM

I do fairly well with a TH350 and 3.08 gears. I can get about 15 highway and still pull fairly large loads.

10-18-2005, 12:41 AM	#1
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	Overdrive vs Ring & Pinion I was thinking the other day, yeah it hurt, that just changing the ring and pinion so the final drive ratio would be the same as if you kept the original gears but installed an OD tranny would be a pretty cheap and easy way to save fuel. I know you would lose the low end power and this is not a fix all thing, but for the many people here that are using the truck as a driver it should work. If you have a 4 speed manual tranny now, the effect would be similar as having an OD automatic. The 3 speed would pull a bit slower to speed maybe. You can get as low as a 2.56 or 2.73 ring and pinion set I think for our axles. If you had 3.73's originally that would be .73 OD for the 2.73 gears and .68 OD using the 2.56 gears. I'm done thinking now. Go about your business. HG __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

10-18-2005, 04:34 AM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: Overdrive vs Ring & Pinion I do fairly well with a TH350 and 3.08 gears. I can get about 15 highway and still pull fairly large loads. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"



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