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Unread 01-10-2008, 10:44 AM   #1
KMAC
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Gear ratios

Does anyone have a link to a gear ratio chart for an automatic transmission. This is like all of them I have found for manual transmissions and just says the automatic transmission will be higher.

http://www.4wheelparts.com/wheelTirePackage.aspx#
then under gear ratio chart.

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Unread 01-10-2008, 10:46 AM   #2
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check this link.

http://www.jeepforum.com/forum/showp...80&postcount=6
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Unread 01-10-2008, 05:36 PM   #3
KMAC
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thanks i have seen that, but I am looking for one similar to the one I have linked. Looking for one that shows a chart of automatic transmission jeep (99 3spd) with different tire sizes (31s and 33s minimum) and the axle gear ratios that make up what RPMs.

Thanks for the reply though.
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Unread 01-10-2008, 05:54 PM   #4
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Check this out. (http://www.grimmjeeper.com/gears.html)
When you plug in your transmission it will tell you what the ratios are for each gear. And it will help you determine the best axle ratio for your tire size.
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Unread 01-10-2008, 06:05 PM   #5
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you can use the chart that you referenced. it is all based on a final drive of 1:1, which is what your 3rd gear auto is 1:1.
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Last edited by 2jhanna; 01-10-2008 at 06:27 PM..
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Unread 01-11-2008, 07:31 AM   #6
KMAC
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Quote:
Originally Posted by 2jhanna
you can use the chart that you referenced. it is all based on a final drive of 1:1, which is what your 3rd gear auto is 1:1.
it says with an auto my rpms will be higher do to slippage. got it, but how much higher and what will mine look like?

the other chart gets a little complicated does it have a manual?
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Last edited by KMAC; 01-11-2008 at 08:19 AM..
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Unread 01-11-2008, 07:36 AM   #7
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Quote:
Originally Posted by KMAC
it says with an auto my rpms will be higher do to slippage. got it, but how much higher and what will mine look like?...
Its about 5%.

So take the # on the chart and multiply by 1.05.

If you want perfect results, don't forget to factor in your actual tire diameter. Very few tires measure up to their sidewall height.
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Unread 01-11-2008, 07:45 AM   #8
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Quote:
Originally Posted by chefdab
Check this out. (http://www.grimmjeeper.com/gears.html)
When you plug in your transmission it will tell you what the ratios are for each gear. And it will help you determine the best axle ratio for your tire size.
Best gear calc!
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Unread 01-11-2008, 03:29 PM   #9
2jhanna
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Quote:
Originally Posted by KMAC
it says with an auto my rpms will be higher do to slippage. got it, but how much higher and what will mine look like?

the other chart gets a little complicated does it have a manual?
i thought that with a lock up torque convertor that there was no slippage ???
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Unread 01-11-2008, 04:03 PM   #10
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Quote:
Originally Posted by 2jhanna
i thought that with a lock up torque convertor that there was no slippage ???
There is still some slippage, but it is very small.

A check engine light is triggered if slippage is greater than 3%.

I just use 5% for calculations to err on the conservative side.
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Unread 01-11-2008, 04:21 PM   #11
Waldn
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With a locking torque converter slippage should actually be less than a clutch.
I have found those charts to be very acurate with my set up.
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Unread 01-11-2008, 04:29 PM   #12
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Quote:
Originally Posted by Waldn
With a locking torque converter slippage should actually be less than a clutch.
I have found those charts to be very acurate with my set up.
No offense intended, but with the 2.5 do you have enough TQ to slip the convertor?

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