I replaced the ujoints and now my tires. It still does it but I've found that is only does it on occasion when I go through a rough area of road. So everytime I drive over a rough patch of road or an area that's particulalrly ...humpy I guess would be the word, I've been slowing down. When is does start wobbling if I slow down by about 20mph it stops and I can continue driving again normally. Also it's not just at low speeds like I orginally thought, it'll do it at 55 and it scares the hell out of me. I'm going to put it up on stands and see if there is a wobble but you would think it would be consistent if it were something bent. Is it possible the parking brake might cause it if it was malfunctioning? Or possibly the bumps causing the rear differential to misalign momentarily? Thanks for all ya'll's help.

 

Are you feeling this thru the the body or thru the steering wheel? I can not think of any way for a differential to misalign momentarily and this doesn't sound like a brake problem.

 

I wonder if a bad trans mount would do this? Bumpy road might lift it out of the saddle.

How about a broken part of your rear suspension. Spring perch or hanger bolt broken. Maybe rubber insulator worn out.

How about a bent or loose rim.

 

Does your truck have front drums?

 

It has rear drum front disc brakes. Everything looks straight under there. The rims don't appear to be bent and I think they probably would've told me they were at the tire shop if they were. I'm not sure if it's related but my front disc brakes just locked up yesterday. I haven't got to look into it yet but I believe it's probably a kink in the rubber hose or a bad brake booster. Possibly just a clogged hose but I think they would also limit the fluid going to the brakes too, not just keep it in there. Just started building pressure and wouldn't release. I'll check the tranny mount though see if maybe it's just laying on the crossmemeber or something.

 

Oh and it's definitely a body shake so that's why I'm thinking the rear end. Seems trivial but couldn't hurt to ask but a loose bed on the truck wouldn't cause it would it? I noticed the guy who put it back on neglected a few bolts up in there. Seems on good enough, but I'm no expert... obviously.

 

I'd check out your front brakes. Make sure you can't move the calipers more than a hair (or a handful of hairs). Also check the insides of your wheels and outside of your brake hardware for shiny spots.

 

If your front brakes were causing this vibration you would feel it in the steering wheel before it could be a body shake.

 

Well, it did it again this morning, the shaking thing. I hit some bumps that caused it before and it caused it again... surprising I know. Maybe my shocks, they're air shocks and they hold air fine, so... Maybe if I took a picture of my rearend (the truck's not my butt) then if someone see's something out of place you can tell me. I'll try to get some up soon. But will be going out of town for a week tomorrow night. SO.... after I guess. Thanks for all the help ya'll. I appreciate it. Not rich enough for a shop.

 

WOW... I'm sure if you post a pic of your butt someone would find something out of place. Of that you can be sure.

Seriously though, I had air shocks on an old Camaro hotrod and when I would max out the air, it was real stiff and super bouncey. Also, my rear-end was rusty and eventually rusted through the floor pan and into the trunk making an outrageous vibration on certain roads. Might check your shock mounts.