1994 Ford Bronco Lagging - Drive Train & Driveline

Question: i recently bought a 1994 ford bronco with the 5.8 351. it has 123000 miles on it, when i accellerate there is a clonk right when you accelerate. thought it was the rearend but what i found was the pinion shaft gears were very worn and the pinion shaft was sloppy so i replaced both but the problem is still there. also when i stop it feels like the rearend is moving back into position and then when i accel. it feels like its moving back to the other position with a clonk again. also when driving down the road at 70 if you let off the gas real fast and then hit the gas again theres a clonk right between the front seats. so checked the motor and trans. mounts none are loose. don't know what to look at next???????

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Technican: Hello, Consider lubricating the drive shaft yoke splines. If your u-joints are in need of grease, lube them too. The clunk is the drive shaft binding when the shaft needs to change length to accomodate a change in the height/angle of the suspension. The splines are too dry. Often there is a grease zerk to lube the splines without disassembly. Thoughts?,

Owner: you don't think it could possibly be a delay in the transmission to where when the transmission is up to speed then it is clonking into the driveline, also one more thought i tried doing a brake stand in the garage and there was none of the noise or clonk at all, just when your going down the road that's the only thing that is throwing me off????????

Technican: I would want to eliminate drive shaft splines before I'd look at the trans itself. You haven't stated that shifting is rough/hard. Ford Ranger had so much trouble with drive shaft splines binding in the late '90s that a technical service bulletin (TSB) was issued. I wish it were a recall not a bulletin. If the vehicle was in warranty the entire drive shaft assembly was replaced with one made of alloy metals. Even the diameter of the "new" shaft is larger. Owners who found their warranty expired paid over $500 for the upgrade. Or, they pay to have the splines lubed by hand (no zerk is there) but the problem repeats. It's patience vs. tolerance. Are the splines on your drive shaft free of burrs and lubed well?

Owner: i haven't looked at the drive line splines for lube but did check the u-joints but i guess it is a place to start looking and plus the trans. does shift fine when going thru the gears. thanks for your help i will check the splines. mike

Technican: I'll wait for your findings. You're welcome,

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