the cure for axle hop please - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

 
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post #1 of 10 (permalink) Old 04-22-2008, 09:01 PM Thread Starter
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the cure for axle hop please

Lately ive been getting some axle hop in the rear...just driving down the road. The first BAD time was when i was going about 50 or so down state route 696 and the truck had driven for about 15-20 miles. It started coming on calmly then got to bucking and i pulled over. I started going again after all the cars passed and it was fine all the way home about another 10 miles of driving.

Second time was tonight. Got some mods finalized and took it to Pandora(5 miles) to put a few dollars in the front tank for when i get my new trailer ^_^

Was going home and it started hopping TWICE. I had to slow down to about 20 mph to get it to stop both times. Braking didn't seem to have any effect on it.

Anyways i have my passenger side mirror tilted down so i can watch my tailpipe if i need some cheering up. I saw the tires bouncing up and down when the truck starts hopping.

I had noticed some slight hopping when slowing down when it was still cold out. Never had it buck though. I thought it was just to rotors warping and going bad.

Could this have something to do with the air pressure in my tires? I havent checked them since i bought it which is kinda dumb move on my part. I will check tomorrow.

What causes axle hop anyways?

It seems to me it is ambient temperature related because when it was still in the 30's or lower, it would barely do anything. now in the warmer 70's and 80's, it seems to do it more. Air in tires expanded making them real stiff? I drove it about an hour and half from where i got it and it didnt have a hiccup.

thanks
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post #2 of 10 (permalink) Old 04-22-2008, 11:24 PM
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Axle wrap is what causes it, but should not be doing it at 50mph, something lose maybe, ubolts lose?? my will do it when starting out but its normal but not normal when slowing down or at highspeeds , i put a SMF in and it helps alot with wheel hop, someone else may know a little more..

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post #3 of 10 (permalink) Old 04-23-2008, 01:31 AM
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Yeah, its not axle wrap...wrap is what happends from a stand still...something else is a miss...check your rear suspension out carefully for any oddities (cracks, loose nuts etc...)

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post #4 of 10 (permalink) Old 04-23-2008, 06:13 AM Thread Starter
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Alright will do today after school, I have a 0-5k potentiometer in the icp and it makes it lope. I usually dont set it high enough to make it lope when driving. Could a lope with my SMF cause some hop?

Doesnt make sense to me that it would be the axles because of the full-floaters.??

Anyways ill look and post back.

thanks
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post #5 of 10 (permalink) Old 04-23-2008, 01:04 PM
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something has to be loose

1995 F350, CrewCab, 7.3 PSD Dyno at 390 HP, zf5, 3 in Down pipe with 5in straight pipe with stack, Tymar, DDP stage 2 injectors, Intercooled, Stole it at $2500! 400000miles! Going for 1/2 million

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post #6 of 10 (permalink) Old 04-23-2008, 02:03 PM
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Go get your tires balanced.

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post #7 of 10 (permalink) Old 04-23-2008, 02:39 PM
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Regardless if something is loose back there, you might want to think about getting new shock absorbers (SP?). It wouldn't cure your problem now but would damp down the vibrations in the rear axle in the future.

I was getting a little bit of spring slap on my helpers, Slight bouncing also. Once I put new absorbers(SP?) on it cured my problem, but I think yours sounds more severe.

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post #8 of 10 (permalink) Old 04-23-2008, 06:05 PM Thread Starter
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Check it over, nothing appears to be loose.

I Drove it down the road again to make sure. At the first mile stopsign, i got a TINY bit of bounce only when i applied the brakes.

Hm i might take the tires off and check the rotors and turn them if needed.

That might not be for a while though because i need it friday for a trip. Oh joy, potential for shaking going 65mph on the interstate!!
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post #9 of 10 (permalink) Old 04-23-2008, 06:57 PM
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Are you sure its the rear...is it possible you are getting some shake in the front end?

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post #10 of 10 (permalink) Old 04-23-2008, 08:17 PM Thread Starter
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Well it SEEMS like the rear. I drove it again a few hours ago, pushed the brake while going at around 40mph and it did it again and every time i pushed it so i guess it is brakes after all. I cant feel any quivering in the pedal which leans me toward the rear brakes. If i slam on them, it wont quiver.

I call it hop, not a quiver because its up and down shaking not side to side like a death wobble.
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