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Jul 29, 2009 | 08:15 PM

klook

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Joined: May 2009

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From: East Machias, Maine

hopping

Today when I pulled up to my jobsite to back in, up a slight grade, the vehicle bounced/hopped like the tires were spinning or I was in soft sand. I was on ashphalt and the tires did not spin so what was it? It also reminded me of trying to take of in a large truck with two sets of dual wheels in soft going. Any ideas?

Kevin

Last edited by klook; Jul 29, 2009 at 08:16 PM. Reason: mispelling

Jul 29, 2009 | 10:13 PM

FTE Trigger

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From: Greenvile, SC

Did that incline/grade have a slope or dip off to one side?

I ask that b/c, mine does something similar when I back into a loading dock at one of my suppliers. Its a 20-30* incline with a soft dip off to the driver side.

I assume my "quick" reverse motion is causing a mild wheel slip and grab action while traversing over the dip...

Jul 30, 2009 | 08:21 PM

klook

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From: East Machias, Maine

Hopping

Nope, it is slightly across the hill but both wheels were on the hot top. I wonder if it is because of the angle of the drive shaft on these new trucks. I have that stupid rear dampener on so it should prevent it from hopping up and down.

Kevin

Jul 30, 2009 | 09:02 PM

1saxman

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Joined: Jan 2007

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I doubt if it's the manual trans like mine but I usually get clutch chatter backing up a hill. IMO reverse gear needs to be lower, because you have to ride the clutch a little or you will back up too fast. It probably uses first gear for reverse like many manuals. I'm guessing you're getting some kind of wheel hop even though the wheels aren't spinning. Everything's set up to avoid wheel hop in a forward gear (shock mounting, etc.) but maybe you're getting it in reverse. From what I've seen, the 2007 is a little wheel-hop-happy anyway. I might look into a set of bars for mine. I don't get much wheelspin on dry pavement, but wheel hop is bad if they break loose in the rain.
BTW, have you had this happen with 500 lbs or more on the truck? I'm guessing it wouldn't do it with a load on.

Jul 30, 2009 | 09:28 PM

klook

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From: East Machias, Maine

Hopping

I agree that the backend of these things are really bouncy. That is a good point about reverse being set up different then forward. I have had 1500 lbs. on mine and it rode beautiful. MIght I ask what kind of bar you are considering?

Kevin

Jul 31, 2009 | 01:09 PM

1saxman

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Just kidding, but I was referring to traction bars like we used to install on drag cars on the leaf springs to stop 'axle wrap'/wheel hop on acceleration.