THM 4T60-E – New Design 1-2 Roller Clutch

CHANGE: Beginning at the start of production for 1996 models, all THM 4T60-E transaxles were built with a new design l-2 Roller Clutch Assembly, as shown in Figure 1.  Know more car diagnostic tool ? You can find the hot ones like Maxscan GS500 from obddeal.

REASON: Eliminates a potential high speed freewheel failure and reduces the number of parts needed for the assembly process.

PARTS AFFECTED:
(1) l-2 ROLLER CLUTCH SUPPORT – Roller clutch cam is now the inside diameter design instead of the previous outside diameter design and the bushing that supports it on the final drive ring gear has doubled in width for much improved stability of the l-2 Roller Clutch Support. Refer to Figure 1 for illustrations.

(2) THRUST BEARING – Dimensional changes to accommodate the new design l-2 roller clutch support (See Figure 1).

(3) l-2 SUPPORT SPACER – Eliminated, as shown in Figure 1.

(4) 1-2 ROLLER CLUTCH ASSEMBLY – Dimensional changes to accommodate the new inside diameter cam design l-2 roller clutch parts, as shown in Figure 1.

(5) l-2 ROLLER CLUTCH SNAP RING – Eliminated, as shown in Figure 1.

(6) l-2 ROLLER CLUTCH INNER RACE – Eliminated, as shown in Figure 1.

(7) REACTION SUN GEAR DRUM – Redesigned with the l-2 roller clutch outer race now made as part of the sun gear drum, to accommodate the new design l-2 roller clutch parts, as shown in Figure 1.

(8) FINAL DRIVE RING GEAR – Revised lubrication hole sizes and locations in support to accommodate the new design l-2 roller clutch assembly, as shown in Figure 2.

INTERCHANGEABILITY:
The new design l-2 Roller Clutch Assembly will back service all THM 4T60-E transaxles to 1991, however, all parts listed above must be used as a package.

Figure 1: http://flic.kr/p/dWNvF8
Figure 2: http://flic.kr/p/dWNvEi

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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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