Okay, that helps a bit. If he's already at .100", he's either got good tires 225 wide or bigger, or his rear end is probably a 3.08. I'd say the rebuild didn't affect it. When I had my 95 (w/3.27 trak-lok) I never drilled the 5.4L tranny to .100" and it would WOT chirp 1-2 some times, but that tranny has a different EPC solenoid. That's the only thing affecting the shift really... hole size, line pressure, and resistance (via rear, tires, etc).
related technical rant (for those interested):
Many of us j-modders hear the serpentine belt squeal on a wot shift ... it squeals because the speed of the crank pulley changes faster than the belt has traction to slow. same concept, only opposite side of the driveline. The output shaft is accelerating slowly at the top of the rpm range in 1st gear, and as the rpms come down when 2nd gear engages, the acceleration changes. The faster the shift the bigger the change. The tires, being mechanically linked to the output shaft of the tranny, are also experiencing the same acceleration changes. when the change is too large, the torque load of the engine on each wheel/tire overcomes the friction of the tire.... and voila! *CHIRP* It's a jerk, in the scientific aspect of the word.
That's also why gears play a part. as the rotations of the tire in relation to the rotations of the output shaft of the trans change, so does the acceleration.
Shift kits change the amount of time it takes the clutches to apply/exhaust, thereby making the acceleration changes faster and feel more sudden.
Okay I've gone on long enough. that's way too much for what most people want to know, lol.
96 Mustang GT 5spd. w/ 248A Option (GTS). Stock for now until I get the Roush on.
97 Thunderbird 4.6L LX /w Sport Package
24k B&M Cooler, 1" lowered, Steeda UD Pulleys, Dynomax cat-back, J-mod, 3.73's, PI intake, PI cams, 03 GT MAF/Tube, SCT tuned - Gone but not forgotten.
MAMN12 Drag Racing Team [email protected]
In need of updated times.