No roll .................
Senior User
Joined: Oct 2010
Posts: 217
Likes: 0
From: Rineyville, KY
Jack up the rear end, with the front wheels chocked and the rear on jack stands, put it in drive gun it and let off and see if the rear wheels stop like the brakes are on. If they do then you have it narrowed down to the rear, and pull the rear calipers off and do it again to see what happens. If it still acts like the brakes are applied, then you have a problem with the differental.
Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
Something has to be getting hot! These trucks don't just stop themselves! Did you jack it up and check for free spinning wheels? If it's free, try hitting the brakes a few times hard then try to see if any are hung up. When coasting down the road put your truck in neutral and see if it feels like it let's go. I have a feeling it will let you know what it is soon if you don't find it first! Good luck.
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
Jack up the rear end, with the front wheels chocked and the rear on jack stands, put it in drive gun it and let off and see if the rear wheels stop like the brakes are on. If they do then you have it narrowed down to the rear, and pull the rear calipers off and do it again to see what happens. If it still acts like the brakes are applied, then you have a problem with the differental.
Good idea ............
Lead Driver
Joined: Jul 2003
Posts: 7,404
Likes: 52
From: Wheatland, Mo
I know it may sound odd but I had this happen to another truck of mine. The brake booster went bad and somehow it was applying the brakes. I had to put my left foot under the brake pedal and pull up on it to get the truck home. It would do the same thing. The higher the RPMs the higher the vacuum, the more it braked.
Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
^^ no vacuum on our psd's, they use a hydro boost system, not the conventional air.
I got nothing on this, I was thinking torque converter maybe too, but this is waayyyy outta my league.
Goodluck man, I hope you find it soon, you already know you came to the right place. The Genius powers will help you through this
I got nothing on this, I was thinking torque converter maybe too, but this is waayyyy outta my league.
Goodluck man, I hope you find it soon, you already know you came to the right place. The Genius powers will help you through this
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
Jack up the rear end, with the front wheels chocked and the rear on jack stands, put it in drive gun it and let off and see if the rear wheels stop like the brakes are on. If they do then you have it narrowed down to the rear, and pull the rear calipers off and do it again to see what happens. If it still acts like the brakes are applied, then you have a problem with the differental.
I use IR thermometer all the time to check the health of things. You can tell a couple psi difference in trailer tires, easily evaluate wheel bearings and of course identify a sticking brake caliper. My rear diff runs 150-160* - same as my dually does and the axle bearings are usually just a little over ambient temp... I do feel like my MPG's aren't what they used to be, but since I don't measure the amount of fuel I put in my truck and I've been towing, blowing up turbos and such - its hard to tell.
I had decided not to worry about it - but that strategy doesn't always work so good for me! 
Actually, at 254k, I'd like to do a rebuild and stiffen up the LSD anyway!! 
Thread Starter
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
FIXED>>>>>>>>>>>>>>>>>>>>
Unplugged the wastegate and it goes just fine again.
Thanks for all the ideas.
Unplugged the wastegate and it goes just fine again.
Thanks for all the ideas.
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