Hey all first timer here and what better way to introduce myself than with my problems.
I have a 1998 Mark VIII LSC. It was recently modified. A lower mile(20K) rebuilt 4R70W out of a newer Vic was put in. My installer found a decent amount of clutch material in my original tranny. For $600 to the cost, I thought, eh, what the heck. The car has 4.10 gears, 3800 Stall Circle D converter, kooks headers with x-pipe and stainless mufflers, a JMOD to the valve body and engine and tranny mounts.
Anyhoo, here is the problem. The transmission will neutralize at about 30 mph on light throttle right before lock-up into overdrive. On hard throttle, the transmission shifts like a million bux.
In an attempt to narrow down this issue, here is what has been replaced:
TCC Solenoid (valve body)
SS1/2 Shift Solenoid Pack (valve body)
EPC Solenoid (valve body)
Wiring Harness(valve body)
I have an SCT chip that I bought from Bill over at SCP. Dave Dahlke does his tuning. In my tune, I had the transmission parameters LEFT ALONE. In other words, calibrations were done for the 4.10s and the stall, but shift strength was left stock. No line pressure increase whatsoever.
I hope that the tune solves my issue. I am really running out of options here. My installer keeps telling me the clutch packs are new in the tranny. I hope I can believe him. The guy has been a real corner-cutting d-bag and I really dont know anymore.
Electrical Taped o2 sensor extensions
Noisy gears set at 5 thous. (wtf?!)
Pinhole Exhaust leak on his chinsy weld by the x-pipe
Leaky dipstick tube for the tranny that he had to fix
Slightly Leaking front pump seal
I just want to give you guys an idea of this nut job I have been dealing with. We have been butting heads for a while now.
Here are a couple videos. Sorry about the poor quality.
In the first I am light throttle when the tranny neutralizes.
In this second video, it is a little bit tougher to tell without actually being there. I throttled a little harder this time and it shifts ok. BUT, when I let off the gas at that spot, I can feel the tranny is in neutral in the seat of my pants.(Again, hard to show u when you're not in the car) Then if you watch the tachometer you can see it THUNK into gear. I can feel it like someone kicks the back of my seat.