I have been battling this wicked driveline issue for the last year. I am unsure exactly when it started, it's one of those things that crept up on me. Last Summer I did several "Upgrades" at once so I am not sure who the culprit is (other than me). Keep in mind I can prevent it by manipulating the throttle and clutch. I can eliminate it most of the time, but I am convinced that this is not normal under any circumstances. Please don't post "Driver Error" comments. I really need your help.
Spec Stage 3+ Clutch
Spec Billet Steel Flywheel
New PIlot Bearing
New FORD OEM Slave Cylinder
Shaftmasters 1 Piece Aluminum Driveshaft
FMS 4.10 Rear End Gear
New Clutch Packs
OEM FORD Fluid w/ Friction Modifier
Prothane Motor Mounts
K-Member Brace with Torque Limiters (this was more for the stiff 1-2 shift)
Sometime after all this was completed I started noticing something wasn't right.
I have been researching this all winter and am pretty much at a loss.
I have tried several things in an attempt to resolve this.
New Trans Fluid, tried Motorcraft, Mobil1, currently using Pennzoil synchromesh
Checked all drive line bolts
Checked and adjusted pinion angle several times
Replaced Upper Differential Bushing with Prothane Unit
Replaced Transmission Mount with Competition Engineering Solid Mount
Pulled and Re-greased Pinion Slip Yoke
I have done all the work myself and researched everything to death before I started wrenching. I am sure it's my fault, but I just can't fix this one alone. I have only found one YouTube clip and it sounds EXACTLY the same as mine only this was on a BMW. Unfortunately there are no comments or any resolutions posted. I plan on spending the day in the garage tomorrow working on this so any ideas are truly welcome.