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Old 09-25-2016, 03:28 AM
Thread Starter
Join Date: Sep 2016
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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?


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Old 09-25-2016, 08:30 AM   #2
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Location: Summerville SC
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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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Location: Ohio
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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...
Build thread for OJ, my YJ. 1993 Wrangler S 2.5L/AX-5/NP231 with SYE, Spartan locked Dana 30/Aussie locked Ford 8.8 @ 4.88, SOA lift with 2.5" OME HD springs and front Bilstein/rear Rancho shocks, Barricade 9500 winch, custom front and rear bumpers, 136 amp alternator, 35" Super Swamper LTBs.
1999 Ford F-250 Super Duty 7.3L Powerstroke, single turbo, 6 speed manual.
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Old 09-25-2016, 10:23 AM   #4

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Location: SouthEast of Denver
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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.
"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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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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