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Front End Shake
My 2001 Wrangler has a 3 1/2 BDS lift and a set of 33" tires. Recently
there has been a vibration appearing to be at the drivers side front between 35-40 Mph. I generally can steer out of the vibration or just hold the wheel real tight and get through the vibration which is not apparent once I pass 38-40mhp. I'm just wondering what I might expect to hear when I take it to the shop. I can't imagine wheel bearings, but I can imagine a tire spinning out of round or perhaps I through a weight off the rim. Any ideas? Tnx, Rick |
Re: Front End Shake
On Fri, 06 Apr 2007 23:37:38 GMT, Rick Gunderman <wa4rg@cox.net>
wrote: >My 2001 Wrangler has a 3 1/2 BDS lift and a set of 33" tires. Recently >there has been a vibration appearing to be at the drivers side front >between 35-40 Mph. I generally can steer out of the vibration or just hold >the wheel real tight and get through the vibration which is not apparent >once I pass 38-40mhp. > >I'm just wondering what I might expect to hear when I take it to the shop. >I can't imagine wheel bearings, but I can imagine a tire spinning out of >round or perhaps I through a weight off the rim. > >Any ideas? > >Tnx, Rick THis is common and aften mis diagnoised. You have what I call a caster "Death Wooble". It happens a lot with lifts that can change caster angle of axle and also the bigger tires change the dynamics of forces placed on front axle too and effect stabilty. SO will say you have loose jiont or bushing which can aggrevate it but it is the fact that the frontend is dynamically unstable to begin with that it shakes whether the joints or bushings are loose or not. Typically with some lift they tip axle forward to improve unjoint angel but the problem is that it also decreases positive caster. Toe in also play a role here. Factory alignement spec are for factory tires and wheel and when you change hthis sometimes you need to tweak them some. If you want to realy fix this you need to get your front end read to se what caster, camber and toe-in spec it is set too now. If I can see this data I can tell you what you need to change if your alignement tech cannot figure it out. I used to align these things 20 to 30 years ago back when ther was not computer racks and you had to understand how and why it works. Todays tech do littlew more than follow a software program and are lost when it does not fix it. ----------------- TheSnoMan.com |
Re: Front End Shake
On Fri, 06 Apr 2007 23:37:38 GMT, Rick Gunderman <wa4rg@cox.net>
wrote: >My 2001 Wrangler has a 3 1/2 BDS lift and a set of 33" tires. Recently >there has been a vibration appearing to be at the drivers side front >between 35-40 Mph. I generally can steer out of the vibration or just hold >the wheel real tight and get through the vibration which is not apparent >once I pass 38-40mhp. > >I'm just wondering what I might expect to hear when I take it to the shop. >I can't imagine wheel bearings, but I can imagine a tire spinning out of >round or perhaps I through a weight off the rim. > >Any ideas? > >Tnx, Rick THis is common and aften mis diagnoised. You have what I call a caster "Death Wooble". It happens a lot with lifts that can change caster angle of axle and also the bigger tires change the dynamics of forces placed on front axle too and effect stabilty. SO will say you have loose jiont or bushing which can aggrevate it but it is the fact that the frontend is dynamically unstable to begin with that it shakes whether the joints or bushings are loose or not. Typically with some lift they tip axle forward to improve unjoint angel but the problem is that it also decreases positive caster. Toe in also play a role here. Factory alignement spec are for factory tires and wheel and when you change hthis sometimes you need to tweak them some. If you want to realy fix this you need to get your front end read to se what caster, camber and toe-in spec it is set too now. If I can see this data I can tell you what you need to change if your alignement tech cannot figure it out. I used to align these things 20 to 30 years ago back when ther was not computer racks and you had to understand how and why it works. Todays tech do littlew more than follow a software program and are lost when it does not fix it. ----------------- TheSnoMan.com |
Re: Front End Shake
On Fri, 06 Apr 2007 23:37:38 GMT, Rick Gunderman <wa4rg@cox.net>
wrote: >My 2001 Wrangler has a 3 1/2 BDS lift and a set of 33" tires. Recently >there has been a vibration appearing to be at the drivers side front >between 35-40 Mph. I generally can steer out of the vibration or just hold >the wheel real tight and get through the vibration which is not apparent >once I pass 38-40mhp. > >I'm just wondering what I might expect to hear when I take it to the shop. >I can't imagine wheel bearings, but I can imagine a tire spinning out of >round or perhaps I through a weight off the rim. > >Any ideas? > >Tnx, Rick THis is common and aften mis diagnoised. You have what I call a caster "Death Wooble". It happens a lot with lifts that can change caster angle of axle and also the bigger tires change the dynamics of forces placed on front axle too and effect stabilty. SO will say you have loose jiont or bushing which can aggrevate it but it is the fact that the frontend is dynamically unstable to begin with that it shakes whether the joints or bushings are loose or not. Typically with some lift they tip axle forward to improve unjoint angel but the problem is that it also decreases positive caster. Toe in also play a role here. Factory alignement spec are for factory tires and wheel and when you change hthis sometimes you need to tweak them some. If you want to realy fix this you need to get your front end read to se what caster, camber and toe-in spec it is set too now. If I can see this data I can tell you what you need to change if your alignement tech cannot figure it out. I used to align these things 20 to 30 years ago back when ther was not computer racks and you had to understand how and why it works. Todays tech do littlew more than follow a software program and are lost when it does not fix it. ----------------- TheSnoMan.com |
Re: Front End Shake
SnoMan <admin@snoman.com> wrote in news:3upd13tnl1r53aalsfp0gkgo3sekke475l@
4ax.com: > > Thanks Snoman, I appreciate your comments and expertise. I had the jeep lifted a couple years back and this is something that has just come about lately. I can see why they call it a death wobble, whew, when it starts shaking it's aweful; I'm just thankful it's only aweful at low speed. As I said, once I get to 40mph things feel fine. I'm sure the tires don't help, they're MT Baha Claw Radials. There's a guy down the street that has a tire shop. I'll take it to his place and get those readings. He well may know what to do but I'll run it by you. Thanks again for the assistance. Rick |
Re: Front End Shake
SnoMan <admin@snoman.com> wrote in news:3upd13tnl1r53aalsfp0gkgo3sekke475l@
4ax.com: > > Thanks Snoman, I appreciate your comments and expertise. I had the jeep lifted a couple years back and this is something that has just come about lately. I can see why they call it a death wobble, whew, when it starts shaking it's aweful; I'm just thankful it's only aweful at low speed. As I said, once I get to 40mph things feel fine. I'm sure the tires don't help, they're MT Baha Claw Radials. There's a guy down the street that has a tire shop. I'll take it to his place and get those readings. He well may know what to do but I'll run it by you. Thanks again for the assistance. Rick |
Re: Front End Shake
SnoMan <admin@snoman.com> wrote in news:3upd13tnl1r53aalsfp0gkgo3sekke475l@
4ax.com: > > Thanks Snoman, I appreciate your comments and expertise. I had the jeep lifted a couple years back and this is something that has just come about lately. I can see why they call it a death wobble, whew, when it starts shaking it's aweful; I'm just thankful it's only aweful at low speed. As I said, once I get to 40mph things feel fine. I'm sure the tires don't help, they're MT Baha Claw Radials. There's a guy down the street that has a tire shop. I'll take it to his place and get those readings. He well may know what to do but I'll run it by you. Thanks again for the assistance. Rick |
Re: Front End Shake
"Rick Gunderman" wrote in message ... > Thanks Snoman, I appreciate your comments and expertise. I had the jeep > lifted a couple years back and this is something that has just come about > lately. I can see why they call it a death wobble, whew, when it starts > shaking it's aweful; I'm just thankful it's only aweful at low speed. As I > said, once I get to 40mph things feel fine. I'm sure the tires don't help, > they're MT Baha Claw Radials. > > There's a guy down the street that has a tire shop. I'll take it to his > place and get those readings. He well may know what to do but I'll run it > by you. > > Thanks again for the assistance. > > Rick I had the same thing happen. New lift, new tires, no vibrations. As the 33 BFG's wear down, the vibration appears. I rotated my tires with the best on front and the vibration went away. Try a new tire balance and your vibration will likely go away also. -- JimG 80' CJ-7 258 CID, HEI 4.56 Gears, Lock-Right F&R 35" BFG MT on 15x10 Centerlines D44 Rear, D30 Front. SOA Dana 300 w/4:1 & Currie twin sticks Warn X8000i w/ dual batteries 00' TJ Sport 4.0L, 5sp 4.56 Gears, TrueTrac rear 33" BFG AT on 15x8 Eagle Alloys D35 Rear, D30 Front. 3" Suspension Lift Warn X8000i |
Re: Front End Shake
"Rick Gunderman" wrote in message ... > Thanks Snoman, I appreciate your comments and expertise. I had the jeep > lifted a couple years back and this is something that has just come about > lately. I can see why they call it a death wobble, whew, when it starts > shaking it's aweful; I'm just thankful it's only aweful at low speed. As I > said, once I get to 40mph things feel fine. I'm sure the tires don't help, > they're MT Baha Claw Radials. > > There's a guy down the street that has a tire shop. I'll take it to his > place and get those readings. He well may know what to do but I'll run it > by you. > > Thanks again for the assistance. > > Rick I had the same thing happen. New lift, new tires, no vibrations. As the 33 BFG's wear down, the vibration appears. I rotated my tires with the best on front and the vibration went away. Try a new tire balance and your vibration will likely go away also. -- JimG 80' CJ-7 258 CID, HEI 4.56 Gears, Lock-Right F&R 35" BFG MT on 15x10 Centerlines D44 Rear, D30 Front. SOA Dana 300 w/4:1 & Currie twin sticks Warn X8000i w/ dual batteries 00' TJ Sport 4.0L, 5sp 4.56 Gears, TrueTrac rear 33" BFG AT on 15x8 Eagle Alloys D35 Rear, D30 Front. 3" Suspension Lift Warn X8000i |
Re: Front End Shake
"Rick Gunderman" wrote in message ... > Thanks Snoman, I appreciate your comments and expertise. I had the jeep > lifted a couple years back and this is something that has just come about > lately. I can see why they call it a death wobble, whew, when it starts > shaking it's aweful; I'm just thankful it's only aweful at low speed. As I > said, once I get to 40mph things feel fine. I'm sure the tires don't help, > they're MT Baha Claw Radials. > > There's a guy down the street that has a tire shop. I'll take it to his > place and get those readings. He well may know what to do but I'll run it > by you. > > Thanks again for the assistance. > > Rick I had the same thing happen. New lift, new tires, no vibrations. As the 33 BFG's wear down, the vibration appears. I rotated my tires with the best on front and the vibration went away. Try a new tire balance and your vibration will likely go away also. -- JimG 80' CJ-7 258 CID, HEI 4.56 Gears, Lock-Right F&R 35" BFG MT on 15x10 Centerlines D44 Rear, D30 Front. SOA Dana 300 w/4:1 & Currie twin sticks Warn X8000i w/ dual batteries 00' TJ Sport 4.0L, 5sp 4.56 Gears, TrueTrac rear 33" BFG AT on 15x8 Eagle Alloys D35 Rear, D30 Front. 3" Suspension Lift Warn X8000i |
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