trans issue at wot

hey guys i have a 98 gtp with the 3800sc it has 107k its been modified a decent amount over stock running more boost a cam headers and a very small stall converter. i recently just put a new trans in from a 98 regal gs wit supposedly 60k , i checked the vin codes and they were a perfect match rite gears and such. it worked great for a few days but now if u pin it off the line or 10mph from 1st 2 second gear it hits rev box before it shifts, it doesnt seem to slip cuz it pulls hard! just shifts way to high! and it doesnt do it at all at half to 3/4 throttle wrks perfect, i also have a shift kit in it if that makes a difference and my line pressure is higher from zzps pcm please help if anybody no's i really dont want to pull my trans again.

Do you have any kind of tuner? Is the PCM stock shift points modified?

Do you have any kind of tuner? Is the PCM stock shift points modified?
my shift points and the line pressure were modified from my zzp pcm, a buddy of mine who did my cam tune was gonna lower the shift points at wot so im hopen that fixes the problem.

What is the current WOT shift point? Or what are your RPMs reading when the issue occurs?

Typically Stage 1 v1.0 PCMs whether ZZP, DHP or Intense are set for around 6000 rpm and obviously programmed for higher line pressure. Any lower and you will be reverting back to the stock settings. The shift kit should have nothing to do with your issue. All it does is firm up shifts (shift timing) and nothing to do with the shift points.

What is the current WOT shift point? Or what are your RPMs reading when the issue occurs?

Typically Stage 1 v1.0 PCMs whether ZZP, DHP or Intense are set for around 6000 rpm and obviously programmed for higher line pressure. Any lower and you will be reverting back to the stock settings. The shift kit should have nothing to do with your issue. All it does is firm up shifts (shift timing) and nothing to do with the shift points. its shifting at like 6600 or so maybe higher i dont knw its in that range tho def over 6k it drives fine otherwise shifts great as long as ur not wot, 7/8 throttle is even fine, and like i said its not slipen so thats why i wanted to lower my shift points. the other trans always shifted high so maybe zzp put it that high instead of 6000 cuz like i said the other one always shifted high just not high enough to hit rev box but every trans is different

its shifting at like 6600 or so maybe higher i dont knw its in that range tho def over 6k it drives fine otherwise shifts great as long as ur not wot, 7/8 throttle is even fine, and like i said its not slipen so thats why i wanted to lower my shift points. the other trans always shifted high so maybe zzp put it that high instead of 6000 cuz like i said the other one always shifted high just not high enough to hit rev box but every trans is different i did it again today and idk maybe 6400rpm it did it

I would swap the speed sensor from the old trans to the new one Just to make sure it ins't causing an issue.

Then maybe get it scanned with a trans scanner and let us know if it comes back with any codes.

:confused:

6600 rpms? That is insane. What brand cam do you have, rocker ratio, and spring rates? When you replace transaxles or do major transaxle work you need to get the PCM reset and the adaptive shift data (TAPS) cleared out and relearned. A GM Tech II scan tool is required or maybe a trans shop has a scanner/scan tool capable of doing that.

:confused:

6600 rpms? That is insane. What brand cam do you have, rocker ratio, and spring rates? When you replace transaxles or do major transaxle work you need to get the PCM reset and the adaptive shift data (TAPS) cleared out and relearned. A GM Tech II scan tool is required or maybe a trans shop has a scanner/scan tool capable of doing that.
i ahave a xp comp cam with 105# springs and dif retainers and it has the stock ratio 1.6 rockers ,and the guy who tunes my car has a hp tuner on his laptop who can mess with the trans shift points in such u think that would be capleable? and i just drove the car its siten at about 63 or 6400 rpm i over exaggerated alil ,srry but its still high

I would swap the speed sensor from the old trans to the new one Just to make sure it ins't causing an issue.

Then maybe get it scanned with a trans scanner and let us know if it comes back with any codes.

i switched the speed sensor and no difference):

i switched the speed sensor and no difference):

I dont know. Did you make sure the PRNDL switch was adjusted when you put the new trans in? Just curious.

I dont know. Did you make sure the PRNDL switch was adjusted when you put the new trans in? Just curious.
i didnt adjust it at all but all the gears work when there suppose to and thats just a switch for starting and reverse lites, dont think that would cause a problem, thanx for the input tho ik u guys r just graspen at straws and i appreciate it let me no if u guys can think of anything else

I suggested the following earlier and there was no reply.



When you replace transaxles or do major transaxle work you need to get the PCM reset and the adaptive shift data (TAPS) cleared out and relearned. A GM Tech II scan tool is required or maybe a trans shop has a scanner/scan tool capable of doing that.

I suggested the following earlier and there was no reply.
whoops i dnt now anybody with one of those my guy with the hp tuner programer should be able to reset it for me u think thats it? ive never hurd of that before

whoops i dnt now anybody with one of those my guy with the hp tuner programer should be able to reset it for me u think thats it? ive never hurd of that before

well changed the shift points on the trans to lower and seems to wrk great they were kinda high they were at 6200 thanx for all the feedback guys:wink:

What shift point is it now set to? How many rpms? If you check the specs on XP cams it recommends programming the shift points up to 6400 rpms which IMO could be too high regardless of the valvetrain mods. I run 6200 rpm shift points with my Intense PCM with no problems with SLP 1.8 roller rockers, no hot cam :grinno: and other supporting mods.

What shift point is it now set to? How many rpms? If you check the specs on XP cams it recommends programming the shift points up to 6400 rpms which IMO could be too high regardless of the valvetrain mods. I run 6200 rpm shift points with my Intense PCM with no problems with SLP 1.8 roller rockers, no hot cam :grinno: and other supporting mods.
6000 or 5800 idnt remeber but the trans is prolly dien wit my luck i need a heavy rebuild i guess or something, i wish i new more bout the automatic slush box than i do, it could be something way simple its not burnen fluid or anything

I really don't now what to say. Sad to see you have to detune so much. :shakehead Waste of a good hot cam and performance. Oh well.

I really don't now what to say. Sad to see you have to detune so much. :shakehead Waste of a good hot cam and performance. Oh well.
ik it really sux maybe i can raise the rev box zzp recommends 6800 rev and 6400 shift point? and it still goes i hung on a bumper of a 86 stang wit a 351 and cam that runs mid 12s and he didnt get away took me by a half a car