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VBOD · 08-09-2011, 02:15 PM

I know, I know, it's not your typical eco car but it's sentimental. This has been a 25 year project that never really got to assembly phase. The original engine/trans/differential are pulled. Original plans where to use a Q-jet carb'd, 350 v-8 through a TH350 3spd into a 3.08:1 axle. Mod's would be grill block, electric fans, skirts, lowered, belly pan, O2 tuning, locking TC, open to other suggestions. This car will see easy going family outings of about 10%/40%/60% city/rural/freeway.

So, now I'm struggling on which rear gears to use: 2.42, 2.73 or 3.08 with the TH350 to keep me in the efficient "sweet spot". I'm looking for a 200-4r to get lower freeway rpms. Which rear gears do you think would maximize efficiency; other input considered?

08-09-2011, 02:15 PM	#1 (permalink)
VBOD EcoModding Lurker Join Date: Jul 2011 Location: Yakima Valley, WA Posts: 45 Golden Egg - '95 Geo Prism LSI 90 day: 32.48 mpg (US) Family Truckster - '99 Mercury Mountaineer 4x4 90 day: 16.03 mpg (US) Big Green Machine - '89 Chevrolet V3500 3+3 4spd 4.56diff. 90 day: 11.47 mpg (US) Hondyssey - '04 Honda odyssey 90 day: 23.13 mpg (US) Thanks: 0 Thanked 0 Times in 0 Posts	'53 4dr Chevy Sedan I know, I know, it's not your typical eco car but it's sentimental. This has been a 25 year project that never really got to assembly phase. The original engine/trans/differential are pulled. Original plans where to use a Q-jet carb'd, 350 v-8 through a TH350 3spd into a 3.08:1 axle. Mod's would be grill block, electric fans, skirts, lowered, belly pan, O2 tuning, locking TC, open to other suggestions. This car will see easy going family outings of about 10%/40%/60% city/rural/freeway. So, now I'm struggling on which rear gears to use: 2.42, 2.73 or 3.08 with the TH350 to keep me in the efficient "sweet spot". I'm looking for a 200-4r to get lower freeway rpms. Which rear gears do you think would maximize efficiency; other input considered?