Transaxle problem diagnosis - 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 11-02-2004, 11:57 PM   #1
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Default Transaxle problem diagnosis

I did a little research about common transaxle problems, and heres a list of symptoms and causes :

High shift efforts : Engine peformance related; worn or faulty reverse clutch; worn or damaged accumulator sealing(*)

Harsh upshift : Engine performance related; faulty underdrive clutch; worn or faulty overdrive clutch; worn or faulty 2-4 clutch, worn or faulty reverse clutch; bad gear shfit control linkage adjustment

Harsh downshift : worn or faulty underdrive clutch; damaged clutch seal; worn/damaged accumulator sealings; bad gear shfit control linkage adjustment

Harsh neutral (N) to reverse (R) engagement : shift linkage damaged

Delayed neutral (N) to reverse (R) : engine coolant temp too low

Delayed neutral to drive engagement : engine performance related; worn/faulty underdrive clutch; faulty 2-4 clutch; faulty/worn reverse clutch; damaged clutch seal; damaged accumulator sealing

Erratic shifting : engine performance; faulty overdrive clutch; worn/fault 2-4 clutch

Buzzing noise (shifts only) : chipped gear teeth ; planetary gear broken; bearings worn/damaged

Drives in neutral (while moving) : clutch plate clearance insufficient; faulty cooling system

Harsh torque converter shift control : clutches dragging ; faulty reverse/low clutch; worn underdrive clutch

Hopefully some of that can help some people going through the transaxle blues..
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Old 11-03-2004, 10:20 PM   #2
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Last time I checked, the 4T60-E doesn't have a 2-4 clutch. Did you mean 2-4 band? And I have no clue at all what an underdrive clutch is. Our trannies have:

2-4 band
Reverse input clutch
Overrun clutch
Forward clutch
Forward sprag
3-4 clutch
Lo-roller clutch
Lo-reverse clutch

Throw in a couple of shift solenoids, TCC and a manual positions switch and you're all set.
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