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  #1  
Old August 4th, 2009, 10:48 AM
Gibson04
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Justin Church
1994 D90 / '04 Disco
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zf auto and 1.667 transfer case

I am running 33 inch tires with a zf auto and a 1.667 transfer case. When on the Highway I am running approx 62.5 mph at 3000 rpms.

Is anyone running 35's or 37's with this setup? I am tryingto get an idea of what to expect (speed vs. RPM's) when upgrading tire sizes. Ive tried entering in all the gear ratio's on couple different sites to calculate this info and dont feel it is entirely accurate.

I am going to buy some tires for my 90 and want to be in the in the 2600 - 2800 rpm range at 72 mph seeing that I drive this truck to and from the trails.

Thanks

Justin

Follow-up Post:

Here's the numbers Im putting into the calculator.

Zf has 4 forward gears. 1st gear = 2.73:1, 2nd = 1.56:1, 3rd = 1:1, 4th = 0.73:1. Im running 1.667:1 (high range) transfer case and 3.54 gears in the rear ends.

Are the Zf numbers correct?
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  #2  
Old August 5th, 2009, 06:34 PM
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Dana Hammersley
1997 Arles Blue #162
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ratios

I put 4:11 Gears in mine and love it. At 70 mph it tacks 27-2800 rpm with 33's on it though.
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Old August 5th, 2009, 06:36 PM
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evilfij
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http://www.grimmjeeper.com/gears.html
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  #4  
Old August 5th, 2009, 08:08 PM
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John B.
1991 Defender 90, 200TDI
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http://members.shaw.ca/red90/gears.html#zf4
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