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Transmission TECH/TALK

Allison 1000/2000 P2 Planetary Carrier Changes

In this edition of Transmission Tech/Talk, Wayne Colonna describes a new design for the Allison 1000/2000 P2 sun gear thrust bearing.

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CHANGE:

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Vehicles equipped with the Allison 1000/2000 transmission built in September 2006 and later, have a new design P2 Sun gear thrust bearing (T5 Allison reference) for increased capacity, starting with serial number 6310696028. See Figure 1 for Tag information.

Figure 1

REASON:

For improved durability

PARTS AFFECTED:

  1. P2 SUN GEAR THRUST BEARING (T5)- The thrust bearing thickness and dimensions of the races changed as shown in Figure 2.
  2. P2 SUN GEAR- The inside diameter of the Sun gear dimensionally changed, as shown in Figure 2, to accommodate the new dimensions of the new thrust bearing.
  3. P2 CARRIER ASSEMBLY- The carrier assembly changed to accommodate the bearing changes, as shown in Figure 3. See Figure 3 also for the location of the P2 carrier assembly in the cut-away illustration. See Figures 4 and 5 for an exploded view of the complete planetary assembly.
Figure 2
Figure 3
Figure 4
Figure 5

SERVICE INFRMATION:

P2 SUN GEAR THRUST BEARING (T5)……………………………………………………………              29541702

P2 SUN GEAR…………………………………………………………………………………………….             29545931

P2 CARRIER ASSEMBLY…………………………………………………………………………………                       29545240

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INTERCHANGEABILITY:

None of the parts listed above are interchangeable for back service, unless used as a set. Note: If back servicing, it will be necessary to verify endplay and internal stack-up. Thicker sun gear spacer Part number 29541728 may be required for transmission serial numbers prior to 6310467635 (Indy.) or 6320601447 (Baltimore built). See Figure 1 for Tag information.

Legend for figures 4 and 5

   1.  INPUT SUN GEAR, P1SUN GEAR (INSTALLED IN C1/C2 HOUSING).

   2.  INPUT SUN GEAR/P1 PLANETARY CARRIER THRUST BEARING.

   3.  P1 PLANETARY INTERNAL RING GEAR.

   4.  P1 RING GEAR/P2 RING GEAR “PEEK” THRUST WASHER.

   5.  P1 PLANETARY SNAP RING, RETAINS P2 INTERNAL RING GEAR.

   6.  P1 PLANETARY CARRIER ASSEMBLY.

   7.  P2 PLANETARY INTERNAL RING GEAR.

   8.  P1 PLANETARY CARRIER/P2 PLANETARY CARRIER THRUST BEARING.

   9.  P2 PLANETARY SNAP RING, RETAINS P3 INTERNAL RING GEAR.

 10.  P2 PLANETARY CARRIER ASSEMBLY.

 11.  P3 PLANETARY INTERNAL RING GEAR.

 12.  TRANSMISSION MAIN SHAFT.

 13.  P2 PLANETARY CARRIER/P2 SUN GEAR THRUST BEARING (T5).

 14.  P2 SUN GEAR.

 15.  SUN GEAR SPACER.

 16.  P3 SUN GEAR.

 17.  P3 SUN GEAR/OUTPUT SHAFT THRUST BEARING.

 18.  OUTPUT SHAFT (MODEL SENSITIVE)..

 19.  P3 PLANETARY CARRIER ASSEMBLY.

Figure 13 With Legend

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