Crazy Highway Shake only once in a while

Oren76

New member
OK, I need ya'll ideas. I've had this 4R all of about 1 week. It's a 99, 2WD, automatic with 202K. It's been running great. Have had it at highway speed many times, no issues.

Then yesterday I took it on the first "long trip" of about 600 miles round trip. Was cruising along at 70mph no problem, like always. Then about an hour into the trip it started shaking like I threw a weight. Mildly at first and then gradually got worse till it felt like it would shake apart. Pulled off the highway and checked all tires and they were fine. No weights gone. No bulges on the tires. (They're brand new, less then 5000 miles).

I did notice grease inside both rear wheels, so both rear axle seals seam to be blown (it's going to Toyota tomorrow for that). The U-joint had been replaced by the previous owner. I saw nothing broken or out of place. Got back on the highway, nothing. No shake. 35 minutes later it starts again, mild to wild. Stopped on the shoulder, checked the tires again, nothing. Took off, no problem.

every 45 minutes to an hour the whole trip it was doing it, and only at highway speed. I felt nothing driving in town. All I had to do was come to a complete stop and then go again and the shaking would stop.

WTH is going on? Any ideas?
 
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The rear brake shoes have swollen with gear oil. When they heat up they begin to grab and make the truck shake. It will go away once the axle seals are repaired.

*Before and after the work is done, ask the mechanic to verify the seals aren't seated too deeply in the pocket by using grease on the inner spacer before he buttons it up. Trust me on this one. otherwise it may leak again.
 
The rear brake shoes have swollen with gear oil. When they heat up they begin to grab and make the truck shake. It will go away once the axle seals are repaired.

I had them replaced today, so hopefully you're right! Thanks
 
FYI axle seals cost about $10 and can be replaced in about 1 hour your first go at it.

Thanks. I thought about it, but after reading about brake bleeding, well....that's out of the scope of my bravery. Last thing I need is brake failure on a mountain road. :roadkill:
 
Yeah I hear you. Just remember that this site has a lot of writeups on doing it yourself. If you've got a set of tools and a garage, almost anything is possible. However, that being said, time is money... you've just got to do what your comfortable with.
 
Did they replace just the seal or the bearings as well?

The primary reason the seals fail is worn bearings. So if they only changed the seal, it will leak again. Might as well take it back now have have the bearings replaced before the new brake shoes are ruined.
 
You'll also need new brake shoes and a thorough cleaning of the drums.

If it happens again, back off your adjusters and don't apply the e-brake with too much force (leave in gear to help).

I had the same issues. Not sure if it's shoe flex or what but it causes the rear drums to drag. Good time to clean the e-brake bell housing as well. Easy job.
 
Did they replace just the seal or the bearings as well?

The primary reason the seals fail is worn bearings. So if they only changed the seal, it will leak again. Might as well take it back now have have the bearings replaced before the new brake shoes are ruined.

They just did the seals. Said the bearing were OK. :wtf:


Guess time will tell.
 
Yeah I hear you. Just remember that this site has a lot of writeups on doing it yourself. If you've got a set of tools and a garage, almost anything is possible. However, that being said, time is money... you've just got to do what your comfortable with.


Yep. Also, I'm a few days away from a move from Texas to Colorado so I've sold most of my tools and I'm staying with relatives so no garage (Or even a flat driveway for that matter). Got my Chilton Guide so maybe once I'm settled I'll be more adventurous should the need arise.:biggrin2:
 

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