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Old September 20th, 2010, 10:02 PM   #1
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Default Wheel hop at 55

Alright. I have a 93 F150 (5.8 w/ 250k) with a SAS up front. In the back there is a 6" block and the 2" block that was back there originally. I have been getting a terrible wheel hop at about 50-55 mph. I was told at first that it was a bad tire. I was told to move it to the back and it went away for a little while. (or maybe I didn't get above 55) Anyway, the hopping is terrible. If this happens with ice on the road, I WILL be in the ditch. Need to get it fixed. With new tires running $350 x 4, I am trying to figure out where to spend my money most effectively/accurately. I know the double block is not the best idea. I know at 250k the springs have seen their useful days pass them by.

So, do I replace tires, replace springs, traction bar or???

ps, I am unemployed and will be moving soon. So, I need to spend WISELY.

Thanks for your ideas.
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Old September 20th, 2010, 10:18 PM   #2
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check to see if the tire is out of balance. Re-balancing a tire should be cheap.

As far as the blocks, not cool man. I've heard horror stories about stacking lift blocks. Would hate to hear you got hurt cause of em.

What kind of tires do you have anyway? How big are they? Are they radial or bias ply?
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Old September 20th, 2010, 10:22 PM   #3
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Double lift blocks = unsafe
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Old September 20th, 2010, 11:17 PM   #4
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Definetly, get rid of the lift blocks. The factory ones alone will cause wheel hop. I'd rather see you add more leafs to the leaf pack then running blocks. SuperLift sells an Add-a-leaf for under $100 that will give you 2.5 inches. You might want to look into a shackle flip as well.

good luck
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Old September 20th, 2010, 11:44 PM   #5
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So if I read that right, there's 8" total of blocks?

Is there a traction bar of some sort? If not your rear axle might just be wobbling back and forth, that's a lot of leverage to have against those springs.
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Old September 21st, 2010, 12:05 AM   #6
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Moving a bad tire from the front to the back a good tire does not make, the tire probably got worst Oct time, add this to a hacked suspension then throw in some bad bushings and warn shocks its death on wheels.
Sounds like you need to be looking at your tires. Then your springs, then your shocks. None nay be "that bad" but combine all 3 and toss in 8" blocks and look out...
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Old September 21st, 2010, 08:07 AM   #7
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with a factory block + a 6" lift block, did you ever turn the axle to correct pinion angle?

I would bet at 55mph, your u-joints are just trying to escape.
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Old September 21st, 2010, 08:12 AM   #8
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Quote:
Originally Posted by fsumotorhead View Post
with a factory block + a 6" lift block, did you ever turn the axle to correct pinion angle?

I would bet at 55mph, your u-joints are just trying to escape.
This
...Is my guess too.
I hope yours doesn't explode at 70mph like mine did.
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Old September 21st, 2010, 06:47 PM   #9
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Quote:
Originally Posted by fsumotorhead View Post
with a factory block + a 6" lift block, did you ever turn the axle to correct pinion angle?

I would bet at 55mph, your u-joints are just trying to escape.
I did not do the lift myself. I had a mechanic do it here in Muskegon. The pinion angles are correct.

The tires are 37 BFG MT's (37x12.5x17) I am not sure if they are bias or radial.

The axles and suspension were completely rebuilt with all brand new parts (minus the rear springs). The universal joints were new as well. At $2500 I ran out of enough money to get new springs.

The tires have all been rebalanced. Some a couple times.

Dollar for dollar with safety in mind, I was thinking/hoping it was the springs. They look pretty flat. The add a leaf sounds good. But, will it be effective with the worn springs?

The truck starts jumping up and down around 55 but usually when I am backing out of the gas. If I catch it before the tire gets airborne, I can give it some throttle and it will stop.

I was kind of hoping for a confident answer. I am not in a position to buy springs, then buy tires and find out it was something else. I know the blocks are not the safest.

I have to drive the truck down to Florida within the next few months.

With the added information, are there any more ideas?
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Old September 21st, 2010, 08:43 PM   #10
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If money is a major issue, and I was in your shoes........I would probably be searching junkyards, and LKQ for some leaf packs and just build a multi-leaf pack from factory springs to get the height.

I don't see any other cheap alternative, other then maybe a shackle flip.
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Old September 22nd, 2010, 05:31 AM   #11
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Stock springs tend to be pretty flat, the more arch in a spring the stiffer the ride. With that much blocking you need to worries about warring from axle wrap because I'm sure you have plenty of that.
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Old September 22nd, 2010, 06:13 AM   #12
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x? on the full spring pack swap. Blocks are bad, mmmmmmkaaaay.


And btw,

"All lift blocks must be of single piece construction, and cannot exceed 4 inches in height between the rear axle and springs, or 3 inches between the body and frame."

http://www.michigan.gov/documents/hi...law_8580_7.pdf
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Old September 22nd, 2010, 07:14 AM   #13
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My first idea was water or mud in the tire that would cause a shake, but your second discription talks about changing the hop with throttle leeds me to believe its drive shaft angle I would double check that because the shop you hire may not be the best if they stacked blocks.
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Old September 22nd, 2010, 07:57 AM   #14
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You did not say if the shocks were replaced, sounds like the shocks are toast. New springs and shocks is the answer.
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Old September 22nd, 2010, 10:43 AM   #15
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Are you sure it's the rear?

I've seen this happen on the Ford trucks before, but it was the front hopping due to a loose track bar.
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Old September 22nd, 2010, 12:53 PM   #16
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Yeah- double check your track bar and steering links- also may be a blowd out shock- seen that plenty of times on the way into work on other vehicles- to eliminate the tires- ask around to any of your buddies that may have the same bolt pattern wheel if you can swap tires for a quick test-drive. That would quickly verify it without dropping said $350....
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Old September 22nd, 2010, 02:23 PM   #17
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Quote:
Originally Posted by akojsp View Post
Alright. I have a 93 F150 (5.8 w/ 250k) with a SAS up front. In the back there is a 6" block and the 2" block that was back there originally. I have been getting a terrible wheel hop at about 50-55 mph. I was told at first that it was a bad tire. I was told to move it to the back and it went away for a little while. (or maybe I didn't get above 55) Anyway, the hopping is terrible. If this happens with ice on the road, I WILL be in the ditch. Need to get it fixed. With new tires running $350 x 4, I am trying to figure out where to spend my money most effectively/accurately. I know the double block is not the best idea. I know at 250k the springs have seen their useful days pass them by.

So, do I replace tires, replace springs, traction bar or???

ps, I am unemployed and will be moving soon. So, I need to spend WISELY.

Thanks for your ideas.

where at in muskegon are you so i can remind my self to stay off the road?
and if you would like pm me and we can arrange to get it to my place and look at it. My dad owns a automotive shop.
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Old September 22nd, 2010, 06:05 PM   #18
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Quote:
Originally Posted by 94rangeron35s View Post
where at in muskegon are you so i can remind my self to stay off the road?
and if you would like pm me and we can arrange to get it to my place and look at it. My dad owns a automotive shop.
I'll probably take you up on the offer.

BTW, all six shocks are brand new.
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Old September 22nd, 2010, 07:07 PM   #19
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Stop driving that thing. Check for a bent wheel or some thing. Broken belt in a tire. Loose lug nuts. It also sounds like some bushings are shot and you might be getting some u-joint bind and causing some issues. Have dave look at it and he can probably shoot you in the right direction.
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Old September 22nd, 2010, 07:51 PM   #20
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Take a pic of the rear drive shaft at the rear end and post it up. Did your mechanic do any sort of drop on your transmission crossmember?

Deff check all of the above. And good luck finding it.
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