Bad mod or Bad Transmission?
Ok, I'll admit up front I didn't do a search. But not real sure what to search for! I'll explain the problem and maybe someone can help out.
A friend and coworker of mine just traded his 9x Camaro SS for an 02 Mustang GT (a step up in my opinion). The car runs good, and sounds good and has the usual "bolt on mods" that street racers love today. BBK intake, MAF, TB, and Plenum. A louder exhaust, and lowering springs. The car came with a Diablo tuner as well.
The problem is the transmission (guess I'd better say its an automatic LOL). When in normal Drive (with the OD switch in normal position) the car shifts WAY too soon, and even more so under hard acceleration, then it has a hard time making its mind up between 3rd and OD. If you accelerate from highway speeds (as if to pass a car) it again bounces between 3rd and OD. If you turn OD off the car shifts normally, letting the car go up to redline before shifting up to the next gear during hard acceleration. Under relaxed acceleration (day to day use) it shifts normally.
The previous owner is a self professed street racing junkie, so I have to wonder if he did something to the tune or the transmission to make it do that (though I have no idea why he would). Or if there is something wrong/broken with the transmission. Any thoughts?
I offered to help the guy do a J-Mod but figured it'd be best to have a properly functioning transmission first.
1997 Thunderbird Sport
destined to remain stock
1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
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