...Unfortunately, it lowers the WOT shift points on a 96-up, possibly requiring a tune. ...
I didn't see this at all; the shift points in the 4r70w are set by the eec.
You can change how fast something happens, which may be what you're talking about, but it should still start the shift at the same MPH/throttle setting.
A properly jmodded 02 tranny will shift in ~0.2 seconds 1-2, ~0.6 seconds 2-3 , and the 3-4 can be <1.2 seconds, if you use that, and are insane. Overlap on the 3-4 is a concern, lol.
I've measured these, by programming various pressure in the eec. That's a Limit I found by testing my stuff, but changing springs/kits in the VB
gives different results.
Sonnax makes various improvements.
The longest part of tuning my car was getting the shift points correct; my Tbird drives like a manual.
Lazarus Is a manual, after it leaves first; I put a JY tranny in it, and it locks the TC after it leaves first.
I thought it would die a quick death, but it's still in there a few years later.
I'd bet it would leave the car on a WOT 3-4 shift, lol.
Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.
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