THM 4L60 (700-R4) NEW DESIGN LIP SEALS

CHANGE:
Beginning on February 28, 1989 (Julian Date 059), all 1989 THM 700-R4 transmissions were built using lip seals with the new short lip design, on pistons designated with an asterisk in the 'Service Information" section of this bulletin. The remaining 3 seals will change to the new short lip design at a later date.

REASON: Ease of assembly at the factory. Find more Launch Product for help?

PARTS AFFECTED: PISTON LIP SEALS - New shorter lip design; See Figure 1 for profile view of the lip seals.

INTERCHANGEABILITY:
The new design short lip seals are interchangeable with the previous lip seals. The new
design will replace the current seal as stock is depleted.

SERVICE INFORMATION:
Reverse Input Piston Outer Seal ........................................................................... 8673356
Reverse Input Piston Inner Seal ............................................................................ 8673357
3-4 Piston Inner Seal ............................................................................................. 8673358
3-4 Piston Outer Seal............................................................................................ 8673359
Forward Piston Outer Seal .................................................................................... 8673360
Forward Piston Inner Seal .................................................................................... 8673361
Overrun Piston Outer Seal................................................................................... 8673362
Overrun Piston Inner Seal .................................................................................... 8673363

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THM 4L60 (700-R4) - Electronic Speed Sensor Added To Trans

CHANGE: Electronic Speed Sensor added.

REASON: The Speed Sensor provides an extremely accurate signal which is used by the ECM to provide anti-skid braking. The Speed Sensor and Rotor replace the speedometer adapter and speedometer drive gear (see Figures 2 and 3). Current usage is on C trucks with 4.3L, 5.0L, 5.7L, (Gas) and 6.2L (Diesel) engines. This change went into production July 17, 1986.

PARTS AFFECTED: 1. The speedometer adapter and speedometer drive gear are replaced by the Speed Sensor (99) and Rotor (699). See Figures 2 and 3.

2. Output Shaft (687), has an added groove to remove and install the Rotor. See Figure 4.

3. Transmission Case (10), the orificed cup plug installed in the governor bore which provides lubrication to the extension housing bushing when the Speed Sensor Rotor is used, see Figure 1. This lube was normally provided by the spinning speedometer driven gear teeth throwing oil to the bushing. When the speedometer gear is replaced with a Rotor the forced lube of orificed cup plug is needed.

INTERCHANGEABILITY:
1. The new Speed Sensor CANNOT be used in previous models.Sensor.............................................................................
2. The new case with the orifice cup plug can be used on regular speedometer, 1987 models only.

SERVIVE INFORMATION:
1. Rotor, Speed ..........8663090
2. Speed Sensor ................................................................................................ 8654750
3. "0" Ring Seal .............................................................................................. 15552872
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Figure 1: http://goo.gl/OiibI
Figure 2: http://goo.gl/nCYbG
Figure 3: http://goo.gl/kOmEp
Figure 4: http://goo.gl/MSx4g