Best Gear Ratio?
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Joined: Dec 2008
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From: Mt.Angel
Best Gear Ratio?
im wondering what would be the best gear ratio for a dana 60 rear and front trac-loc(posi). it would go on a 1978 bronco with a 460 that will be in the mud 70% and road 30%. dont rock crawl just muddon and trail busting.
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Joined: Jul 2003
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From: Olympia USA
You failed to mention the most importnat factor, tire size. The larger the tire diameter, the lower gear you'll need. Transmission is the #2 aspect. Autos tend to need lower gears where manuals can compensate a bit more.
Tuned
Joined: Apr 2002
Posts: 495
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From: Western US
Having trouble making up your mind?
With 35s I would look to 4.45 maybe 5.13 but that might be a bit low for mud we do not get much of that around CO.
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From: western montana
i might agree with above i think but would also need to know torque curve of the engine...thats a big deal. An engine like my 400 with 400ft lbs at 2krpm...and its an engine that i would not want over 4k very often and never over 5k. So 4.11 might be a better bet... could be similar with your 460 depending on if it's upgraded or an older 460 that wasn't neutered in '72 and after.
theres a site linked somewhere... probably in the off road thread that will give you charts for tire size etc...final gear is whats important. I'd also look at my experience what I like and compare prev rigs to the chart for a comparison. Most serious folks know from experience what they want.
For me the ultimate would be a t18-19 tranny, gearmaster under/overdirve going to a 205 transfer case and 4.11 range gears with 33" tires. You have 8 forward gears with all the ow end I need plus a final drive that would have me at 2400rpm @ about 70-75 mph or 2k @ 60-65 for great mileage.
theres a site linked somewhere... probably in the off road thread that will give you charts for tire size etc...final gear is whats important. I'd also look at my experience what I like and compare prev rigs to the chart for a comparison. Most serious folks know from experience what they want.
For me the ultimate would be a t18-19 tranny, gearmaster under/overdirve going to a 205 transfer case and 4.11 range gears with 33" tires. You have 8 forward gears with all the ow end I need plus a final drive that would have me at 2400rpm @ about 70-75 mph or 2k @ 60-65 for great mileage.
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Joined: Jul 2006
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From: Louisiana
4.10 gears are perfect in my 79 bronco with a 460 c6 automatic and 38 inch boggers. throws mud 20 ft. in the air with ease and smokes the tires easy too
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