Rear differential or something else?
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Joined: Feb 2013
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Rear differential or something else?
I have an old 1993 F150 automatic with the straight 6. This truck is 2 wheel drive and has right at 190,000 miles on it. The kid who sold it to me only had 5 cylinders hooked up to the distributor, and it also had a couple other minor issues. I got everything straightened out with the exception of a vibration that seems to be coming from the drive train. If I am accelerating hard, it is fine. If I am coasting it is fine. For some reason, if I am just cruising along maintaining speed there is a vibration that seems to be coming from the rear half of the truck. It is not the U-joints because I already replaced both of those. I have been told it might be the rear end, which makes sense, but when I lift the back tires off the ground and spin them there is no grinding or strange sounds back there.
I just want to get some input as to what might be causing this issue. I only paid $700 for the truck, so if it is something too expensive to fix I will probably just drive it till it dies completely and scrap it.
I am a novice mechanic at best, so dont be afraid to mention things that might sound stupid or obvious to others.
Thanks ahead of time!
Brandon.
I just want to get some input as to what might be causing this issue. I only paid $700 for the truck, so if it is something too expensive to fix I will probably just drive it till it dies completely and scrap it.
I am a novice mechanic at best, so dont be afraid to mention things that might sound stupid or obvious to others.
Thanks ahead of time!
Brandon.
Cargo Master
Joined: Apr 2003
Posts: 2,408
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From: Parkesburg PA
My first guess is it could be axle bearings. Not that hard to do and you can do the end seals too. At a minimum check/change the fluid in the rear.
As for "it's only a $700 truck..." You can usually find good used rears for $150... Start looking and be ready.
As for "it's only a $700 truck..." You can usually find good used rears for $150... Start looking and be ready.
Logistics Pro
Joined: Mar 2011
Posts: 4,197
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From: Central Wisconsin
First, I'd see about balancing the tires, because that should be cheap, second, I'd change the diff fluid (also cheap). If that doesn't fix it, at least you've done some preventative maintenance for later. It does sort of sound like a pinion bearing problem.
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Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
If there was pinion issues, then it should be howling due to gear noise.
I'm thinking tires. Deflate each rear tire and check for sunken spots/broken cords. Had a front tire that did this and it would shake at a constant speed. Accel or decel and it wouldn't.
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Joined: Apr 2006
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It's Torque Convertor shudder. Really common with E4OD's at higher mileage. Try this, get going and find a small incline, as it begins vibrating, hold throttle steady to keep it shuddering and lightly tap the brake, the shuddering will stop as it takes TC out of lockup.
Change Trans. fluid, Drive, if issue still exists, add 2 2oz tubes of Dr Tranny Instant Shudder Fixx, available at Napa. 99% Chance you will be good to go after that, if not, you're looking at pulling the E4OD and changing out the TC.
Good luck
My '94 F150 went through the same thing. As I said, really common with E4OD's and even AOD's.
Change Trans. fluid, Drive, if issue still exists, add 2 2oz tubes of Dr Tranny Instant Shudder Fixx, available at Napa. 99% Chance you will be good to go after that, if not, you're looking at pulling the E4OD and changing out the TC.
Good luck
My '94 F150 went through the same thing. As I said, really common with E4OD's and even AOD's.
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