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Old 01-21-2013, 02:55 PM   #1
geputten
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Default Transmission slipping...?

Hi all,

Just replaced an engine in a '00 L100 (yup, cam chain tore up slides) with 142K on it, AT trans, for a friend of my wife's....

Runs great now with only 75K on her newer engine, but I notice a slipping BETWEEN 3rd and 4th, during the transition time... does NOT slip in any gear, just between. First gear shifts alittle hard into second, but not all THAT bad.

Never drove the car before it blew up, but owner claims it wasn't slipping, altho she's an older lady (wife claims she DRIVES like an old lady) with 99% in-city driving. And I'm running it pretty hard to check things out on country hi-ways.

Read here that a tranny tune-up helped others... so I did a filter and fresh dex3 yesterday and went out for about 50 miles today with no improvement. In fact, it seems to be slipping a little longer between 3rd and 4th.

I read here that there's a Pressure Control Solenoid that may be the cause? How to verify this is the problem?

Any ideas?

Thanks in advance...

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Old 01-21-2013, 04:37 PM   #2
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Default Re: Transmission slipping...?

Okay, after a couple of hours of research I see that GM has had continuous problems with the 4T65E (2000 to 2002) transaxles and the PCS had been replaced with a better version in 03.

Also that the trans may need reflashing: "Transmission Adaptive Pressure (TAP)" to recalculate shifting....?

Is this trans (4T65E) in both the L100 and the 6 cyl L300? Seems like all the trans issues here are for the L300, but my symptoms are similar....?

Thanks again

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Old 01-21-2013, 04:37 PM   #3
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Default Re: Transmission slipping...?

I'm no transmission expert. Most complaints which seem to point towards the Pressure Control Solenoid are about a "jerking" which comes and goes erratically. I have had the sad experience of feeling a transmission slip as it's going bad and it feels nothing like the PCS jerking does.

Sometimes that jerkiness disappears altogether - as it had for me for several years - only to mysteriously show up once or twice in a day, and disappear again. For that reason I've never touched the one in my transmission.

Take a look at the following link for information on our automatic transmissions. It's not a repair guide, but about theory and operation and includes information about how the various solenoids function in assisting gear shifts.

http://www.scribd.com/doc/34146364/4T40E

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Old 01-22-2013, 11:06 AM   #4
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Default Re: Transmission slipping...?

Okay.... My bad... the Saturns use a 4T40E with the 2.2 and a 4T45E with the six.... Pretty much the same tranny as the "65" but different.

Plan on taking the car to a tranny place today. The guy there believes it's an internal problem because the problem's only in one gear....

Ugh.

Oh, pierot, that's the most comprehensive tranny doc I've ever seen! I thought my head was gonna EXPLODE!

Found a couple of "low mileage" tranny's for a couple of hundred bucks.... Good God, that woulda been alot easier while I had the engine out.....

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Old 01-22-2013, 12:01 PM   #5
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Default Re: Transmission slipping...?

It is possible the catalytic converter may be restricted or partially restricted. I have seen this before and it causes the transaxle to have a late shift or perception that it is slipping, sounds crazy but like I say have seen it before. It may not be a bad idea to get the backpressure checked in the exhaust first.

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Old 01-22-2013, 04:25 PM   #6
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Default Re: Transmission slipping...?

Went to visit 65 yr old Billy ("been at this here location 35 years") and his younger sidekick... they did a thourough job roadtesting the L.... Once with me and once just the two of them.... Both concur that it's an internal slippage because it affects only 2nd into 3rd and 3rd (worse) into 4th.

First to 2nd is perfect.

"If it was the PCS you'd be having the same problems in all gears...."

Looks like I'm picking up a used 65K tranny for $250 in a couple of days.

Oh, re: the CC... a plugged CC would result in poor engine performance and serious backpressure (been there) because of the choking exhaust.

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