Slipping 1-2 Shift at WOT

[1998gpgt]

So my current setup in the 98 is xp, headers, ic, and a 2.6". I still have the stock 120k non-hd trans in there. It is finally starting to get pissed off. I am actually pretty surprised it has lasted this long.

Every 1-2 WOT shift results in it not shifting where I want it to. I have the 1-2 shift point set at 5900rpm. I have to let off the gas most of the time if I want it to shift into second. If I don't, it revs up well over 6k.

What is the best way of going about getting every last drop of life out of this trans? Lowering the shift point, upping the line pressure, or something else?

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[TwistedSoundCo]

Rebuild :iowtfrun:

 

[1quick]

Do you have a shift kit?

 

[1998gpgt]

Rebuild :iowtfrun:

A built trans will be going in at some point. I would not mind delaying the inevitable a little while longer.

Do you have a shift kit?

Negative. No shift kit.

 

[TwistedSoundCo]

I understand that. I got 3 years out of my trans after it started slipping before it bit the dust.

I'd throw in a shift kit and up line pressure and see how it feels

 

[willizm]

sounds like clutch packs going out to me.

 

[PANDA]

sounds like it could be a tuning issue.

what about 2-3? It only lags at WOT?

 

[YoushallgoFo]

how are the fluid levels?

 

[GTPpower]

Make sure your rev limiter is set high enough.

If that looks good, increase your shift line pressure and decrease your elapsed shift time.

If that still won't work, lower your shift point to keep it off the rev limiter.

 

[syP]

Do you even shift?

 

[1998gpgt]

sounds like it could be a tuning issue.

what about 2-3? It only lags at WOT?

I have had the same trans tune on the car for 6 years. This issue has gotten progressively worse. 2-3 is fine. The more throttle I use, the worse it gets. Anything above a slow acceleration results in the slipping.

how are the fluid levels?

Fluid level is fine.

Make sure your rev limiter is set high enough.

If that looks good, increase your shift line pressure and decrease your elapsed shift time.

If that still won't work, lower your shift point to keep it off the rev limiter.

1-2 Shift Point is 5900rpm. Rev Limiter is set to 6800rpm. I have attached my current pressure and time settings. What is the best/safest way to go about increasing the pressure and decreasing the shift time? I'm still using a base ZZP trans file. I have never touched it in all the years that I have owned the car.

 

[ktraver97ss]

Stop going WOT?

 

[GTPpower]

I'm assuming that your car doesn't have performance shift. ??

 

[1998gpgt]

I'm assuming that your car doesn't have performance shift. ??

Correct. No performance shift.

 

[PANDA]

shift RPM and MPH need to sit pretty as well as gearing.

 

[1998gpgt]

Welp... looks like that built trans will be purchased sooner than I thought. I got on it in first today and broke something. I have no response from any gear. Engine runs fine but there is a rattling/grinding/knocking coming from the torque converterish area that increases with rpms. I'm assuming it is the input shaft.

 

[smug]

opps lol

 

[Qball]

Welp... looks like that built trans will be purchased sooner than I thought. I got on it in first today and broke something. I have no response from any gear. Engine runs fine but there is a rattling/grinding/knocking coming from the torque converterish area that increases with rpms. I'm assuming it is the input shaft.

That blows. Sorry that happened to you. Nice looking GP, though!