macattack Posted October 6, 2012 Share Posted October 6, 2012 i have been fighting a wobble/sway issue i have with my truck. i changed pads , bushings, torque rods,tie rods, tire balance etc etc etc......at around 40 mph my truck begins to wobble, sometimes worse than other times. at 40 wobble begins and at 45 it ends. when i deaccelerate the wobble shows again at around 40 mph then goes away. i only operate the truck once a week so trying to diagnose can be a pain.i have been messing with the idea about front shocks. my wobble feels like someone is shaking it from side to side. so thinking maybe some shocks would help.anybody have pics of their mr s with front shocks?any other info about my problem would be greatly appreciated.would power divider cause this?thanks Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/ Share on other sites More sharing options...
staxx Posted October 7, 2012 Share Posted October 7, 2012 Sounds like a tire issue to me , if you have any spare tires rims I would swap out for a test drive to see if its in the tire. Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-140674 Share on other sites More sharing options...
macattack Posted October 7, 2012 Author Share Posted October 7, 2012 thanks. my front steers are 425 65 22.5 . the front and all my drives are balanced. but i will take a closer look.i was under the truck yesterday going over it with a fine tooth comb. be damned if i didnt find the driver side front spring shackle (rear of the front shackle. slipper style) the two bolts that hold the spring in the shackle were loose. i retorqued both bolts and one of the bolts threads were stripped. purchased a couple new bolts, washers, nuts all grade 8. let you know how it goes.thanks again Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-140691 Share on other sites More sharing options...
staxx Posted October 7, 2012 Share Posted October 7, 2012 You can have a balanced tire but still be out of round or have a untrue wheel or the way the tire is mounted on rim jack truck up so tire is barely off the ground and spin it by hand . Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-140726 Share on other sites More sharing options...
macattack Posted October 13, 2012 Author Share Posted October 13, 2012 checked my tires today. they all seem pretty good. jacked up the back and rotated each by hand. no issues there. yah this has been keeping me busy. dont really know what to check next.my wobble happens at around 35- 40 mph and after that fine. when i slow back down to 35-40 its there again. the steering wheel does not shake, its like the whole truck rocks side to side between 35-40.now at times its seems if i creep up to 35-40 and hold it for a while just before the wobble it does not seems as bad. weight doesnt seem to make any difference.i also noticed that it seems to happen just before the last shift on my trans. its an allison 740rs automatic. it feels like maybe my driveshaft may be whipping or something. all new u joints and the center bearing seems fine. some movement in the rubber but no more than my other units. i also installed a set of timbrens on the back camelback suspension. it helps for road shock, but did nothing for the wobble? what now? i guess i will keep checking.does anybody think this may be a power divider issue? i also checked my tranny and motor mounts. they seem good. any info on what i can check next would be appreciated.thanks Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-141475 Share on other sites More sharing options...
staxx Posted October 13, 2012 Share Posted October 13, 2012 I still think it is your tires or rims , have had tire shops swear the tires are in balance they would look good no visable signs of issues but we would swap them out for another set and everything would be ok. Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-141497 Share on other sites More sharing options...
staxx Posted October 13, 2012 Share Posted October 13, 2012 Ok here,s one more idea brake drum could be out of round - try backing the adjustment off on front axle a good bit for test drive purpose only and see how she rolls. Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-141503 Share on other sites More sharing options...
macattack Posted October 13, 2012 Author Share Posted October 13, 2012 if the brake drum is out of round would i not see it when the tire is turning?do you mean front drive axle? Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-141505 Share on other sites More sharing options...
staxx Posted October 13, 2012 Share Posted October 13, 2012 Yup if it was jacked up and spining you would see it , do you have a dealership close by that has a dyno they could check with. Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-141544 Share on other sites More sharing options...
macattack Posted October 14, 2012 Author Share Posted October 14, 2012 no i wish there was. i guess i could jack up both rears and take it up to the speed and see from there. just a little chicken shit to try you know. anyways if i remember the wobble still seemed to be there when i put the truck in neutral and coasted. if that says anything. thanks for your help. Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-141569 Share on other sites More sharing options...
staxx Posted October 14, 2012 Share Posted October 14, 2012 Problem has to be in the wheels or tires hubs , jack it up and run it just be careful . Quote Link to comment https://www.bigmacktrucks.com/topic/27676-mr688s-owners-does-your-truck-have-front-shocks/#findComment-141572 Share on other sites More sharing options...
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