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Old 09-25-2016, 03:28 AM
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1989 Jeep Wrangler Speed Problems

Hi Guys,

I have a 1989 Jeep Wrangler 4.2l 6 cylinder automatic and the pick up on the car is not where I think it should be. I know they are not meant to go fast but does anyone have any ideas of what it could be and why it is slower than it should be?

Thanks

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Old 09-25-2016, 08:30 AM   #2
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Size tires you have and gear ratio?

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Old 09-25-2016, 09:27 AM   #3
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Yes, plus those 3 speed automatics are quite sluggish compared to the 5 speed manuals. If you have larger tires and haven't regarded, as said above, you may be running on two gears...
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Old 09-25-2016, 10:23 AM   #4
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If you have larger than stock tires, then a re-gear is advised.

The simplest re-gear is a 4:10 ratio Ford 8.8 from an Explorer for the rear, and a 4:10 D30 from a 2.5 Wrangler for the front.
Cost for such a re-gear in my area is $1000.00 to $1100.00.

Another thing to consider even if you have stock sized tires is a transmission fluid and transmission filter change. Even better, since the Jeep is new to you is change all the fluids - brake, differentials and engine oil & filter. That way you have a baseline for future vehicle services.

The Jeep 4.2 has a respectable amount of low end torque, but acceleration isn't a strong point. Try driving a fellow Jeepers Jeep for comparison. You Wrangler may not have anything wrong with it.

Welcome to the forum.

Good Luck, L.M.
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Old 09-26-2016, 08:19 PM
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Hey guys thanks so much for the help. Turns out I just needed a new accelerator cable and carburetor springs.
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