poor transmission performance - Page 2 - 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 10-04-2007, 10:09 AM   #11
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So you're modding a car that has problems?

Let'* stick to the trans issues in this topic.
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Old 10-04-2007, 10:29 AM   #12
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Quote:
Originally Posted by wjcollier07
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.
Just a niggle, but there should be around 20 rpms of slip at full lockup. This is intentional, and is done to provide a very small isolator between the engine and transmission. I just learned this one a few months ago, but they are actually programmed that way.

Given that he has an SE, there'* a very good chance he'* running 2.84'*, which will make it feel sluggish.

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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 10-05-2007, 12:16 AM   #13
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Its Like From 0 To 20 Mph I Get More Rpm Than I Should Ya Know? After That There Is Imediate Throttle To Wheel Response. The Fluid, After Driving Is At A Little Above The Cross Hatch. Its Very Clean And Clear, Maybe A Little Red. Smells Like Hot Oil. Need Help With The RPO codes as they are worn off my spare cover mostly. Scan Tool Data I Might Be Able To Get Tomorrow. I Think I Did Read In Chilton That I Have 2.94 Ratio. How Hard Is It To Change That To The 3+ Range? And What Car Can I Get The Parts From?
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Old 10-05-2007, 08:52 AM   #14
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You don't have a 2.94 ratio. It was never offered.

20 rpm'* of slip in TCC lockup for a 4T60 is pretty high from my experience. I'd say 10 to 12 is good for a 60.

Why are you talking about a gear change on a trans that is acting up?
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Old 10-05-2007, 10:20 AM   #15
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Will, The Gear Change Is Just Something I Am Exploring. I Have No Plans To Attempt It Any Time Soon. I Guess I Am Afraid If I Dont Find Out How Now Ill Loose The Chance To. I Still Am Floored At The Wealth Of Knowldge Of BC. I Must Be Mistaken About 2.94. Is There Another Way To Get My RPO codes? I Honestly Dont Know If I Have Any Tranny Problem Other Than Just The Fact That Its An Automatic In The First Place.
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Old 10-05-2007, 10:22 AM   #16
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how do you capitalize every word when you type? (sorry, off topic, just interesting)
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Old 10-05-2007, 10:33 AM   #17
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I Dont Have A Pc. I Do All This From My Cell Phone. I Am Sincerely Sorry About The Weird Formatting It Causes. If I Had 500 Bucks For A Pc I Get The Dent Taken Out Of My Hood. . Laugh
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Old 10-05-2007, 10:34 AM   #18
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Quote:
Originally Posted by SPOILEDRED94
I Dont Have A Pc. I Do All This From My Cell Phone. I Am Sincerely Sorry About The Weird Formatting It Causes. If I Had 500 Bucks For A Pc I Get The Dent Taken Out Of My Hood. . Laugh
no problem, just wondering
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Old 10-05-2007, 12:51 PM   #19
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Quote:
Originally Posted by sonoma_zr2
Quote:
Originally Posted by SPOILEDRED94
I Dont Have A Pc. I Do All This From My Cell Phone. I Am Sincerely Sorry About The Weird Formatting It Causes. If I Had 500 Bucks For A Pc I Get The Dent Taken Out Of My Hood. . Laugh
no problem, just wondering
Actually, I was wondering the same thing

Another way to tell your gear ratio?

did your car come with steel wheels (15"), or aluminum (16"). I've never seen a 15" come with anything other than 2.84'*... if you're an SE, you're probably 2.84'*.

<edit>

Barring all else, if you tell us your engine RPM'* while cruising on the highway, and the vehicle speed, we can differentiate between 3.06 and 2.84.
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Old 10-05-2007, 01:41 PM   #20
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From what I understand on the 60-E the slip should be at a minimum through 96-96... 97 may have a different TCC lock strategy...

But on the 65-E, Its designed to allow for a given amount of slip, as well the clutch is designed to be able to tolerate the extra heat caused by the slip, a lot of the 65'* can lock at a low road speed, giving better economy... These Transmissions can have 20-30 or so RPM'* of slip...

The 60-E for most of the Bonnevilles should see 0-10 Rpms of slip... It would live with 20 Rpms of slip..

At Current I see anything from 10-60 given the tranny temps... If it werent for my cooler I'd be a lot worse off..

And it sounds as if he has transmission slip.. Getting a bit of 2nd gear slip every now and again myself

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