View Full Version : to those with a J-Chip
05-09-2002, 07:15 AM
Will I be able to shift into overdrive at wide open throttle with one installed. That's about my biggest problem right now and it's pissing the hell out of me!!! Thanks in advance!
93 Mark VIII
05-09-2002, 12:18 PM
assuming that there isn't a problem with your trans, you should. I can with my J-chip and 94SC.
If you can't shift into OD now at WOT, it may not be a problem a chip can fix. You'd have to post a message for Jerry or one of the 4R70W gurus.
05-09-2002, 05:10 PM
Not trying to be a smart a$$, but why would you want to shift into OD at WOT ?
You should be able to go well over 100 mph in third. Shifting into OD with a locking converter at full tilt is very hard on the tranny, especially the OD band.
05-10-2002, 12:45 AM
I was afraid of this, apparently I wasn't paying attention, the the problem lies from 2nd to 3rd. Damn it!!!!! It won't shift unless I give it like 3/4 throttle and even at that it's delayed. Bastards. Anyone have any idea's? Thanks!
93 Mark VIII
05-10-2002, 10:47 AM
post it on www.mtcforum.com (http://www.mtcforum.com) there's a lot of 4R70W experts there.
Hot Rod Joe
05-10-2002, 02:16 PM
The 4R70W is a slightly different beast than the AOD. If you are having trouble on the 2-3 wot shift, it's not your computer's fault(sort of). You might have tranny problems or like in my case, mods have caused the tranny to shift too slow to avoid the 5300 rev limiter.
Not sure but I thing the original cal on the 94-95 SC had the converter locked in 2nd above a certain vehicle speed. This would mean a 2-3 shift with the converter locked.
Did you change the gears in the rear recently?
05-10-2002, 03:11 PM
On the 2-3 shift that is. After I got all my mods, my car was accelerating faster than the tranny could shift. As a result I was smacking the rev limiter before it would shift into 3rd. Threw in a Transgo shift kit - problem solved. Now it shifts quick and hard with an occasional chirp into 3rd. The 1-2 shift will snap your neck.
05-11-2002, 02:52 AM
I don't have any other mods other than exhaust though. I dunno, any other idea's? Thanks guys!
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