THM 3T40 (125C) TCC SHUDDER

COMPLAINT: Converter clutch shudder
CAUSE: One cause can be low converter regulator charge pressure, Figure 1, Another cause can be slow drain of converter oil in front of clutch piston,
CORRECTION Install stronger regulator valve spring 8637887 or use a spring from a THM 400 forward or direct clutch retainer Figure 2. Drill converter exhaust hole in separator plate to .080”.

TCC SHUDDER 1

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THM 4L60 (700-R4) HARSH DOWNSHIFT CLUNK IN D3 ONLY
COMPLAINT: Harsh downshift clunk with selector in D3 only.
CAUSE: The cause could be the 2nd apply piston.
CORRECTION: Modify the 2nd apply piston by machining the inner hub and remove .125″ (See Figure 3).

TCC SHUDDER 2

THM 4T60-E – Tie-Up In Park And Reverse Moves Forward In Neutral Tie-Up On 2-3 Upshift

COMPLAINT: After rebuild, the vehicle displays a tie-up condition (In Gear) while the selector lever is in the Park position, a tie-up condition in Reverse, moves forward in Neutral, and a tie-up condition on the 2-3 shift. Get more hot tools UCANDAS VDM and upa usb programmer that are useful.

CAUSE: The cause may be, the. rear lube pipe and  the apply pipe for the 2-l manual servo, reversed in the accumulator housing cover (See Figure 1). This will allow lube oil to apply the 2-l manual servo and the band as soon as the engine is started.

CORRECTION: Install the tubes into the accumulator housing cover with the 2-l manual servo apply pipe in the “Center” hole, as shown in Figure 2, and the rear lube pipe in the right hand hole, as shown in Figure 2. The forward servo apply pipe cannot be installed in the wrong hole as it is a larger diameter than the other two.

NOTE:
Figure 1 shows the ‘incorrect” assembly of the pipes.
Figure 2 shows the “Correct” assembly of the pipes.

Tie-Up In Park And Reverse Moves Forward In Neutral Tie-Up On 2-3 Upshift 2

Tie-Up In Park And Reverse Moves Forward In Neutral Tie-Up On 2-3 Upshift 1

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