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Old March 15th, 2006, 12:10 AM   #1
Captain Ledd
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Default High Trans Gear and Low Axle Ratios?

Is it bad to run a really high ratio transmission with a really low axle gear ratio?

I'm trying to figure out what I'm going to do with my parts runner. It's pathetically underpowered, and needs an upgrade. I'm pondering a diesel, but I haven't emailed the company yet. Anyways,

I'm pretty sure the Ranger has a T-5 transmission, but it's for a 4 banger, and the gears aren't very strong, So I plan on swapping in alot of internal components from a Mustang T-5 that was behind a V8 (keep the Ranger case because it has a hydraulic clutch linkage). Unfortunately, this transmission is going to be used for hefting and towing things, and most of the stock gears and aftermarket gears only go up as they get stronger.

So heres what I'm thinking:
1st - 3.35
2nd - 1.99
3rd - 1.00
4th - 0.80
5th - 0.59 (aftermarket gear, rest are all stock)
R - 3.15
AXLE - 4.88!
Tires - about 30"

The engine advertizes it makes about 300ft lbs of torque, and sits at just under 2,000RPM (if the calculations are correct) at 60mph (which is what I drive on the Hwy) which is right in the peak torque curve for the engine. I think it would make enough power carry a std cab Ranger comfortably. I imagine I would need a specially balanced driveshaft at the least.

Would this cause any problems in the axle? abnormal stresses or wear?

I usually don't ever drive the truck past 70, especially when loaded up.

I keep thinking about it and I can't think of any problems. I'm just paranoid about having ratios that far apart, I haven't seen or heard things usually done this way, thinking there might be a reason for it.

theres alot of people here who have been meddling with gearing alot longer than I have. I'm just trying to figure out how to get some real low end pulling power back out of it.

Last edited by Captain Ledd; March 15th, 2006 at 12:24 AM.
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Old March 15th, 2006, 09:05 AM   #2
Haggar
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So, you're saying drop in a 4.88 gear coupled with the low overdrive?

That actually takes strain off the diff, because the torque multiplication isn't occuring until the final step.

If you go the other way, and put a 6:1 first gear, then you are multiplying the torque heading INTO the t-case, driveshafts, R&P..

By doing it at the axles, the torque load on the earlier components is reduced..
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Old March 15th, 2006, 11:35 AM   #3
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Quote:
Originally Posted by Haggar
That actually takes strain off the diff, because the torque multiplication isn't occuring until the final step.

By doing it at the axles, the torque load on the earlier components is reduced..

Thats what I figured, but everyone is usually talking about super low transmission gears, and not this approach. I just wondered if there might have been an advantage for doing it the other way or a disadvantage of doing things this way, thanks Jesus !
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