Jeep control issue - JeepForum.com
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post #1 of 16 Old 01-07-2020, 07:25 PM Thread Starter
Nolan3838
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I recently purchased an 85 CJ7. The Jeep also had a Cummins 4BT swapped in along with some beefed up running gear and is sitting on 39” tires. My issue is that when I’m accelerating the Jeep pulls one way, when I let off the throttle it wants to pull the other way suddenly. I have to jerk the wheel just to stay going straight. This doesn’t seem like a front end issue at all. There is obviously a lot more torque coming from the 4BT and was wondering if this could be causing a good deal of axle wrap. Would Axle wrap cause this sort of drastic control issue? Would torque bars/ladder bars resolve this? Thanks in advance

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post #2 of 16 Old 01-07-2020, 07:37 PM
MrButterfield
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Right off the bat, I'd check to make sure my spring perches, axle u-bolts, bushings, bearings, etc were all in order in the rear end. You shouldn't be getting any torque steer from a rear axle. I cant imagine axle wrap causing the conditions you mention.
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post #3 of 16 Old 01-07-2020, 07:38 PM
BrutusBlue
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Does it pull hard to the left when you accelerate and then want to return to the right when you let off? I would say that this is not axle wrap is rather just strong torque. Does it do this only under hard acceleration? What is your suspension set up like? Axle wrap should produce a noticeable bounce or vibration feeling type grab under hard acceleration. Are you spring over?
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post #4 of 16 Old 01-07-2020, 07:40 PM
skizriz
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Rear locker?
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post #5 of 16 Old 01-07-2020, 07:42 PM
TerryHowe
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I would think it would be a loose suspension part rather than axle wrap. From your profile picture, it looks like you have a spring over which is going to have wrap, but I wouldn't expect that to cause steering issues. Does it have a locker or a spool in the rear?

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post #6 of 16 Old 01-07-2020, 07:46 PM Thread Starter
Nolan3838
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Rear locker?
It does in fact have a Detroit locker. I completely forgot to mention this
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post #7 of 16 Old 01-07-2020, 07:47 PM
BagusJeep
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Are your engine and transmission mounts in good condition?

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post #8 of 16 Old 01-07-2020, 07:49 PM Thread Starter
Nolan3838
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Are your engine and transmission mounts in good condition?
Yeah they are
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post #9 of 16 Old 01-07-2020, 07:50 PM Thread Starter
Nolan3838
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I would think it would be a loose suspension part rather than axle wrap. From your profile picture, it looks like you have a spring over which is going to have wrap, but I wouldn't expect that to cause steering issues. Does it have a locker or a spool in the rear?
Yep locker in the rear
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post #10 of 16 Old 01-07-2020, 08:02 PM
Cutlass327
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Make sure the tire pressures are equal, and tread depths are equal. I can tell when one tire is lower psi (slow leak somewhere) in the rear because I get that rear shift when I accel/decel with my locker. Seems the difference in diameter makes it more noticeable.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy


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post #11 of 16 Old 01-07-2020, 08:05 PM Thread Starter
Nolan3838
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Make sure the tire pressures are equal, and tread depths are equal. I can tell when one tire is lower psi (slow leak somewhere) in the rear because I get that rear shift when I accel/decel with my locker. Seems the difference in diameter makes it more noticeable.
I could definitely see how that would be the cause. Pretty sure that is. I’ll check tire PSI on both tomorrow and see if that helps. Thanks for the input
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post #12 of 16 Old 01-10-2020, 01:31 PM
Tinker0000
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If the tire pressure is good, I'd check for a possible broken axle on the left rear. The locker would be compensating as if the wheel was on ice or muddy slop.
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post #13 of 16 Old 01-11-2020, 11:05 PM
LumpyGrits
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Tire diameter must be equal to reduce torque steer.
DL's are well known for this.
Gary

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post #14 of 16 Old 01-13-2020, 08:07 PM
ctorj
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If you can Post a picture of the steering linkage.

About 4 years ago when I had my 4bt in my cj7, I had the same issue when I turned the fuel up and got on the gas pedal hard. My issue was the driver side up the jeep was lifting and made the jeep pull one way when i got on the throttle hard. It ended up being the steering.
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post #15 of 16 Old 01-13-2020, 09:10 PM
backupoffmefoo
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I had some scary control issues in mine for a while. It wasn't exactly the same as you are describing... but to fix it I ended up replaced almost all the steering. The culprit ended up being that my steering gear box was loose. Tightening that up and adding a steering gear box brace finally fixed it for me. Runs straight as an arrow off the line now and will do 75 mph on the hwy if needed.

I want my two dollars!
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