Join Date: May 2003
Location: Tinton Falls, NJ
It won't have any effect on the feel of the shifts, but you may tag the rev limiter on WOT shifts. The reason is that the computer knows how long it takes the trans to shift, and how quickly the car accelerates in stock form, so it knows how long in advance to command the shift. If you make the car accelerate quicker, now you could hit the rev limiter before the accumulator in the trans has filled with fluid and caused it to shift. To solve this, you can either give the computer new instructions on when to shift (with a tune) or make it so that the trans doesn't take as long to shift (with the Jmod). Basically you will likely need to do one or the other, but no need for both just to compensate for the gears. The MarkVIII driveshaft is nice, but not absolutely necessary unless you regularly cruise at triple digit speeds. The converter will definitely help, and you would likely need a tune for that, but you would still see a benefit from the 3.73s even without touching anything else. If it were my car, I would do the 3.73s and a Jmod now, then save up to do the converter and tune later. If at any point in the interim you get a hold of a MarkVIII driveshaft, that is easy enoug to swap out, or do it at the same time as the converter since you would have to drop the trans for that anyway.
-91 Cougar LS, coming soon, complete overhaul
with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
-97 Tbird Sport 4.6 Nice weather daily driver
-"Your buddy Mike is INSANE!" -ClintD's dad