Cannot track down vibration

[Tankpick]

Ok I have been trying to track down and fix a cyclic vibration on my truck for the past year and it's been driving me crazy. It happens at all speeds over 25-30 and gets worse the faster you go the trans does not slip and shits fine. Also there is audible clicking coming from the engine bay when under load but i'm not sure if that is related. I have searched many "vibration threads" so I have changed all the usual culprits. So far here is what I have done so far.
-All front end suspension components
-Different Rims/Tires
-New injectors
-New Spark plugs/wires
-New Ignition coil
-New Fuel pump/ pressure regulator
-New one piece drive shaft
-New upper/lower intake manifold gaskets
-New Front/rear brakes (rotors and drums as well)
-Both rear axle shafts have been swapped
-New torque converter/flywheel
-New DPFE sensor/hoses
-New Camshaft sychronizer (old one broke)
-New trans mount and cross member bushings

I have taken it to a highly rated shop twice for diagnosis and both times they could not track down the problem. I also took it to a aamco transmission place twice and they also could not pinpoint the problem either and both directed me at parts I have now changed.

So my question is does this seem like a transmission problem? I have the 4r44e btw. Any advice would be appreciated.

This is a 1996 ford ranger 3.0 extended cab 2wd with 125000 miles

 

[black_demon69]

Ok I have been trying to track down and fix a cyclic vibration on my truck for the past year and it's been driving me crazy. It happens at all speeds over 25-30 and gets worse the faster you go the trans does not slip and shits fine. Also there is audible clicking coming from the engine bay when under load but i'm not sure if that is related. I have searched many "vibration threads" so I have changed all the usual culprits. So far here is what I have done so far.
-All front end suspension components
-Different Rims/Tires
-New injectors
-New Spark plugs/wires
-New Ignition coil
-New Fuel pump/ pressure regulator
-New one piece drive shaft
-New upper/lower intake manifold gaskets
-New Front/rear brakes (rotors and drums as well)
-Both rear axle shafts have been swapped
-New torque converter/flywheel
-New DPFE sensor/hoses
-New Camshaft sychronizer (old one broke)
-New trans mount and cross member bushings

I have taken it to a highly rated shop twice for diagnosis and both times they could not track down the problem. I also took it to a aamco transmission place twice and they also could not pinpoint the problem either and both directed me at parts I have now changed.

So my question is does this seem like a transmission problem? I have the 4r44e btw. Any advice would be appreciated.

This is a 1996 ford ranger 3.0 extended cab 2wd with 125000 miles

almost sounds like wheel or rear axle bearings, u-joints (I know you did drive shaft), tires (had a taurus that i spent 2 years trying to pinpoint what sounded like a low growl in the rear sound didn't go away when tires were moved to the front and sound was still coming from rear. i finally replaced those 2 tires and sound was gone. ) what about the pinion and ring gear.. don't know for sure just throwing these suggestions out there...

 

[Tankpick]

Thanks for the reply, I dont get a groan like you would expect from wheel bearings I have changed the front ones but I was told the rear ones were fine. I experienced the problem before I changed from stock wheels and tires to explorer 16 inch rims and tires although I have heard road force balancing might help. And there does not seem to be any play in the drive shaft joints or ring and pinion when I pull and shake on it.

What I really am hoping to find out does a transmission going bad cause a vibration at all speeds that feels cyclic in nature and you can feel it in your feet and in the seat. If you hit the gas hard it feels like there is no problem but as you coast and slow down it feels like something is out of balance until you apply the brakes heavily and that seems to dull the vibration as you do not feel it in the steering wheel that bad. it just seems having to the shop 4 times they would be able to pick out the problem if it was anything obvious.

 

[gandrimp]

On a 77 monte carlo my wife drove, we put new tires on. It developed a vibration that day. Took it back and they rebalanced the tires, no joy. They replaced the tires, no joy again. Third time the shop changed the shocks, unbelievably it cured the problem that was not there til we put new tires on.

 

[holyford86]

If the carrier bearing is bad it will do that, inspect the rubber bushing around the bearing, if it is dryrotted or has play in it, it will cause a vibration. Look for a driveshaft from a 98 to 00 to eliminate the carrier bearing all together

Sent from my SM-G900P using Tapatalk