THM 4T60-E - Transaxle Case Seal Pocket Change & New 1-2 Servo Seal

CHANGE: Beginning on February 20, 1995, approximately half way through the 1995 model year, all THM 4T60-E transaxles were built using a new design 2-1 servo square cut seal, which also required a deeper seal pocket in the transaxle case (See Figure 1). Since this was implemented as a running change about half of the 95 models will require the previous seal and the other half will require the new design seal. You also can find useful car tools like maxscan gs500 and MINI ELM327 Bluetooth from vtoolshop.com to know more.

REASON: Developed to improve the assembly process.

PARTS AFFECTED:
(1)  2-l SERVO “SQUARE CUT” SEAL - New design square cut seal was made twice as tall as the previous design seal. The new design square cut seal measures .132” tall, and the previous design measures .066” tall, as shown in Figure 1. The wall thickness and seal diameter did not change. This seal retains drive oil in the forward servo circuit to apply the forward band.

(2) TRANSAXLE CASE  - The seal pocket in the case was machined deeper to accommodate the new design square cut seal. The new design seal pocket measures .112” deep, and the previous design seal pocket measures .054” deep, as shown in Figure 1.

NOTE: The new design square cut seal is not currently included in ail gasket packages, but is available separately under OEM service package part number 24204817, which will get you both design seals.

INTERCHANGEABILITY:
The 2-l servo square cut seals are not interchangeable.
Previous design seal must be used in .054” deep case pocket. New design seal must be used in .112” deep cave pocket.

SERVCE INFORMATION:
2-l Servo Square Cut Seal Package (Includes Both Seals) .......................................24204817

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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 vag tacho usb and xprog m 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.
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