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Drivetrain thumping


Kona

06/2014 OTOTM Winner
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621
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Location
Kamloops BC
Vehicle Year
1991
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0L
Transmission
Manual
2WD / 4WD
4WD
Total Lift
7"
Tire Size
35x12.50x15
Hey folks, my 91 Ranger 4x4 (4.0L ) just started making a uneven thumping noise at speeds over 25 mph / 40 kph , seems like it is inline with the transmission bell housing (thus posting here ) though a little under the front floor.. No sound at any rpm in 1st 2nd or neutral , sound is there with engine off in neutral coasting . Hubs are free , transfercase in 2whl drive . Transmission was a spare installed about a year and 1/2 ago. We did have problems sliding the shaft into the pilot bushing . I have checked the bottom 4 transmission bolts for tightness and they were good .
 


Dirtman

Former Middleweight Moss Fighting Champion
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Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
My credo
I poop in the furnace.
Does your driveshaft have the goofy balancer on it (big disc at the front yoke)?

They are notorious for falling apart and making a clunking / thumping sound.
 

ericbphoto

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Transmission
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2WD / 4WD
4WD
Total Lift
6"
Tire Size
35"
My credo
In theory, theory and practice are the same. In practice, they are different.
Somebody has taped a cat to your drive shaft. At low rpm, no problem. At higher rpm, centrifugal force throws his tail out so it hits the floorpan. The tail will break off after a week or so and the noise will go away.
 

Dirtman

Former Middleweight Moss Fighting Champion
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Location
41N 75W
Vehicle Year
2009
Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
My credo
I poop in the furnace.

Kona

06/2014 OTOTM Winner
Canada Military - Veteran
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Joined
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Messages
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Location
Kamloops BC
Vehicle Year
1991
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0L
Transmission
Manual
2WD / 4WD
4WD
Total Lift
7"
Tire Size
35x12.50x15
I did just get brand new tires , a suggestion was separation so I will throw other tires on and check
 

Shran

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Bad u-joint? Do you still have a two piece rear driveshaft? I just rebuilt a rear two piece that had a locked up u-joint at the t-case... it was so bad that it destroyed the carrier bearing and felt like the front end was coming apart at 5mph and faster.
 

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