poor transmission performance - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-30-2007, 12:16 PM   #1
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Default poor transmission performance

I Dont Know For Sure, But, I Think My Tranny Is Slacking. The Fluid Looks Fine. Its Just That I Am Slow Off The Line. What Can I Do? I Hear The Shift Kit For My Tranny Does Not Come Cheap. Would It Help Much? Also What Would I Gain By Replacing As Much Fluid As I Can, Changing The Fluid And Filter And Going With Trick Shift Brand Fluid?
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Old 09-30-2007, 12:34 PM   #2
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What does your fluid look and smell like after driving? Color and level?

What does your scantool say your slip RPM'* are in OD with TCC lockup?
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Old 09-30-2007, 12:40 PM   #3
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Default Re: poor transmission performance

Quote:
Originally Posted by SPOILEDRED94
I Dont Know For Sure, But, I Think My Tranny Is Slacking. The Fluid Looks Fine. Its Just That I Am Slow Off The Line. What Can I Do? I Hear The Shift Kit For My Tranny Does Not Come Cheap. Would It Help Much? Also What Would I Gain By Replacing As Much Fluid As I Can, Changing The Fluid And Filter And Going With Trick Shift Brand Fluid?
First off, the shift kit isn't expensive when compared to other mods. The problem is installing it, since the trans HAS to be out of the car. Going with Trick Shift won't benefit any from what I understand...it'* just a gimmick. For older transmissions, you want something thicker than the norm. Go to Autozone and look for the Coastal trans fluid (yes, it is their brand, but also it is the thickest, reddest fluid I have ever seen, and it works well).

But I think the most relevent question is...what gear ratio do you have? What is your RPO codes for the trans? That will tell us what I think the answer is...your gearing is too numerically low to do anything blistering.
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Old 09-30-2007, 03:36 PM   #4
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Are you saying that its shifting hard/rough? Maybe that its delayed? Slipping? Shuddering?

If the fluid is nice and red and its full, yet transmission performance is still not what it should be, you should definitely run some seafoam trans tune through it and then take it to be chemically flushed. That should wake it right up. Then would be a good time to do the shift kit. It probably just has alot of varnish buildup which will happen after all those miles. It also wouldn't hurt to put a large transmission cooler on it to prolong its life even further. Keeping the temps down also slows down the build up of varnish again too.
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Old 10-01-2007, 05:25 AM   #5
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John, Btw I Dont Notice Any Real Problem. I Just Feel Slow Off The Line. Can I Possibly Do The Flush At Home?
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Old 10-01-2007, 09:34 PM   #6
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Quote:
Originally Posted by willwren
What does your scantool say your slip RPM'* are in OD with TCC lockup?
I don't mean to hijack, but I always wondered what that meant.
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Old 10-01-2007, 10:16 PM   #7
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I hope this is what you're asking....

Lets see...

What is the value for slip RPMs while in OverDrive with the Torque Converter in lockup?

Basically he is asking if the TCC is locking fully when its supposed to. When in overdrive, the TCC is supposed to lock up and create a direct link between the spinning crankshaft and the spinning wheels, it should not be slipping at all while in this mode.

I hope that helped.

Back on topic here, ok, good, it was only a suggestion, but if your shifts are tight, but you're loose off the line, I'd say TC too.
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Old 10-02-2007, 12:49 AM   #8
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Theres A TCC solenoid that controls the fluid flow into the Torque Converter And This Controls Lock Up/slip... So Tranny Fluid Causes Grip And The Lack Of It Causes Slip?
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Old 10-04-2007, 02:22 AM   #9
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Hey, Just An Update. I Did Not Get To Any Tranny Work At All Yet. I Bought An Intake Pipe From Schucks And Installed It. Man You Can Hear The Vaccuum At Idle! Big Improvement. Do I Need A Rider To Watch My Scanner While I Drive To Get Tcc Lock Up Data?
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Old 10-04-2007, 04:28 AM   #10
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well yes, it locks hydraulically, if no fluid, no lock.

and yeah...its recommended just to be safe.
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