Gear ratios ?????? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 12-24-2007, 04:23 PM Thread Starter
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Gear ratios ??????

i have an 01 cummins 5 speed going 65 on the highway im run about 2000 rpm so im pretty sure i have 4 10 rear end i thought about puttin a set of 3 73 in it but i dont want to lose the low gearing ive heard something about some kind of over drive kit you can get and one no any thing about that ??????

97 f 250 xlt 4 inch lift, 36/15.50 tires, hypermax kit with sledghammer turbo, swamps 355mm injectors, compitition fuel system,bdp stealth pumps oil system, head studs, custom 4 inch exhaust, edge evo and ez stack
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post #2 of 17 (permalink) Old 12-24-2007, 05:24 PM
 
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gear vendors has a kit and they used it on project x in diesel power mag, and it seems to be taking their punishment, probably gonna need to look into it
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post #3 of 17 (permalink) Old 12-24-2007, 05:26 PM
 
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Unless you have huge honkin tires. You have 3.54 gears. In theory a 4.10 gear is actually weaker than a 3.54 gear because you have more contact area on on ring and pinion.

For the overdrive kit:
http://www.gearvendors.com/
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post #4 of 17 (permalink) Old 12-24-2007, 05:31 PM
 
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actually 4.10's are the stronges, it balances stress on individual teeth with size and strength of the teeth, in the 3.54's the teeth are small and weaker and can crack individually, but any higher than a 4.10 and you have so few teeth that the stress in each tooth is great, so 4.10 is good, just not for mileage
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post #5 of 17 (permalink) Old 12-24-2007, 05:35 PM
 
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I see
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post #6 of 17 (permalink) Old 12-24-2007, 07:16 PM
 
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i supose u have 5:54 gears, although my speedometer says i am going 75 at 2000 rpm but that is the tire size throughing it off.
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post #7 of 17 (permalink) Old 12-24-2007, 10:20 PM
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Quote:
Originally Posted by 7.3stroker
i have an 01 cummins 5 speed going 65 on the highway im run about 2000 rpm so im pretty sure i have 4 10 rear end i thought about puttin a set of 3 73 in it but i dont want to lose the low gearing ive heard something about some kind of over drive kit you can get and one no any thing about that ??????
I think you got 3.55:1 ratio... I'm running stock tire size 265/75 R16 and I'm twisting 1,900 RPM's at 65 MPH...

At 55 MPH I'm about 1,600 RPM's...

At 75 MPH I'm about 2,200 PRM's...

All these are roughly...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #8 of 17 (permalink) Old 12-25-2007, 02:55 AM Thread Starter
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i have stock tires to might put 33s on it i jus need somein to get the rpm down cause im goin to be driving over 500 miles to school when i go

97 f 250 xlt 4 inch lift, 36/15.50 tires, hypermax kit with sledghammer turbo, swamps 355mm injectors, compitition fuel system,bdp stealth pumps oil system, head studs, custom 4 inch exhaust, edge evo and ez stack
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post #9 of 17 (permalink) Old 12-25-2007, 03:07 AM Thread Starter
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i dont really need all the stuff that the gear vendors does i jus need to drop the rpm in 5th gear would it be better to jus throw a higher set of gears in it

97 f 250 xlt 4 inch lift, 36/15.50 tires, hypermax kit with sledghammer turbo, swamps 355mm injectors, compitition fuel system,bdp stealth pumps oil system, head studs, custom 4 inch exhaust, edge evo and ez stack
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post #10 of 17 (permalink) Old 12-25-2007, 03:19 AM
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Quote:
Originally Posted by 7.3stroker
i have stock tires to might put 33s on it i jus need somein to get the rpm down cause im goin to be driving over 500 miles to school when i go
You want to have the RPM's about 1,800 - 2,100 range at your cruise speed... If you drop below that you lose MPG...

Larger tires would do it the quickest but still your going to lose MPG over it... Most people with larger tires lose MPG quickly to rolling resistance...

Cummins was designed to run between 1,600 (55 MPH) to 2,100 RPM (75 MPH) normally with 3.55 gears...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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