I am getting seasick driving my truck. It bounces like an amusement park ride going down the road. Ok that may be a bit of an exaggeration, but it bounces unpleasantly. I think it is the tires or the tires not being centered on the beadlocks.
I don't think it is the shocks, because it doesn't bounce after bumps in the road. I notice it most when accelerating or coasting. It is bouncy probly 30% of the time and not the other 70%. It doesn't seem to matter if the tires are warm or cold, so I don't think it is just flat spots on the bias plys. I don't feel it in the steering wheel but sometimes it seems to be coming from the front end (I can see the hood going up and down) and sometimes from the rear.
Details:
Suspension: 4" trail master lift with super-stiff front springs and rear blocks. The shocks are also trail master. The rears are inboarded with the DIY4x kit, but are leaning in at about the same angle that the stock shocks lean fore and aft. The lower mounts are just inboard of the springs and the uppers are in the furthest out position.
Axles: 14BFF reaar with 4.88 gears and a detroit. 8 lug 10B front. Hubs seem fine. The left front wheel bearings are a bit tight, but other than that everything seems fine, There is no leakage at the rear hub seal so I doubt the axles are bent.
Wheels/Tires: I believe they are 15x10 Eaton steel wheels with Allied beadlocks. The tires are 38" Super Swampers. I am the second owner of both. There is no apparent damage to the wheels and I would guess the tires have 90% + tread left with no apparent funny wear. I have about 300 grams of airsoft pellets in each tire. See avatar.
I measured the tires after a ~5 mile drive to warm them up and get rid of the flat spots. The run out is:
Left Rear: 5/16"
Right Rear: 3/16"
Left Front: 5/16"
Left Rear: 1/4"
The "tall" part of the tires were about 180* from the "short" part of the tires. I think I am getting the bounces when the tall parts of the tires are "in phase" on one of the axles.
I see several possibilities:
1. I screwed up and didn't get the tires centered on the beadlocks when I put the airsoft pellets in. However the Allied beadlock ring is supposed to be self centering and I followed their procedure for alternately tightening the bolts. I even did it in 3 stages. Could be off by that much?
2. The tires are just that much out of round. Is that normal?
3. There is a little extra material under the bead on the tires. It partly interferes with the beadlock ring bolts. Could that have pushed the tire off center on the bead? See crappy pic.
4. I didn't drive enough to get rid of the flat spots before measuing.
5. The PO mounted the tires wrong and now they have taken a "set" off center from the bead.
6. I am a wuss and I just need to quit whining and take dramamine before taking the truck anywhere.
Any ideas? Sorry 'bout the long post, but I wanted to include all the important info in the first post.
I don't think it is the shocks, because it doesn't bounce after bumps in the road. I notice it most when accelerating or coasting. It is bouncy probly 30% of the time and not the other 70%. It doesn't seem to matter if the tires are warm or cold, so I don't think it is just flat spots on the bias plys. I don't feel it in the steering wheel but sometimes it seems to be coming from the front end (I can see the hood going up and down) and sometimes from the rear.
Details:
Suspension: 4" trail master lift with super-stiff front springs and rear blocks. The shocks are also trail master. The rears are inboarded with the DIY4x kit, but are leaning in at about the same angle that the stock shocks lean fore and aft. The lower mounts are just inboard of the springs and the uppers are in the furthest out position.
Axles: 14BFF reaar with 4.88 gears and a detroit. 8 lug 10B front. Hubs seem fine. The left front wheel bearings are a bit tight, but other than that everything seems fine, There is no leakage at the rear hub seal so I doubt the axles are bent.
Wheels/Tires: I believe they are 15x10 Eaton steel wheels with Allied beadlocks. The tires are 38" Super Swampers. I am the second owner of both. There is no apparent damage to the wheels and I would guess the tires have 90% + tread left with no apparent funny wear. I have about 300 grams of airsoft pellets in each tire. See avatar.
I measured the tires after a ~5 mile drive to warm them up and get rid of the flat spots. The run out is:
Left Rear: 5/16"
Right Rear: 3/16"
Left Front: 5/16"
Left Rear: 1/4"
The "tall" part of the tires were about 180* from the "short" part of the tires. I think I am getting the bounces when the tall parts of the tires are "in phase" on one of the axles.
I see several possibilities:
1. I screwed up and didn't get the tires centered on the beadlocks when I put the airsoft pellets in. However the Allied beadlock ring is supposed to be self centering and I followed their procedure for alternately tightening the bolts. I even did it in 3 stages. Could be off by that much?
2. The tires are just that much out of round. Is that normal?
3. There is a little extra material under the bead on the tires. It partly interferes with the beadlock ring bolts. Could that have pushed the tire off center on the bead? See crappy pic.
4. I didn't drive enough to get rid of the flat spots before measuing.
5. The PO mounted the tires wrong and now they have taken a "set" off center from the bead.
6. I am a wuss and I just need to quit whining and take dramamine before taking the truck anywhere.
Any ideas? Sorry 'bout the long post, but I wanted to include all the important info in the first post.
