Spicer IPL: 454 Tandem Drive Axle - Manual (Page 20)

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Wheel Differential Lock Assembly
Wheel Differential Lock Assembly
After July 1, 1996, (Bulletin ABIB-9609) the diff lock selector switch is located on a piston cover that has a 14 mm threaded hole to accommodate the
129035 switch. The original piston covers are replaced by PISTON COVER UPGRADE KITS and the 129035 selector switch is now included with any Carrier
Unit built after July 1, 1996 (date code H96183). When ordering a piston cover upgrade kit, it is important to select a kit that includes the proper wiring
harness for the vehicle being repaired, reference charts below.
Parts Used Parts Used
Item before 7/1/1996 after 7/1/1996 Description Notes Order Upgrade Kit
1 210280 Note 1 129035 Selector Switch Note 2 –––
2 126618 129034 Nylon Washer - Black –––
3 128146 Note 1 129044 Wiring Harness Metri-Pack 150 Series 508396
4 128445 Note 1 129046 Wiring Harness Metri-Pack 280 Series 508291
5 128481 Note 1 129047 Wiring Harness Weather Pack 508289
6 128641 129425 Piston Cover Inch Thread Airline Hole See Below
6 128612* 129424* Piston Cover Metric Thread Airline Hole 508290
NOTE 1: Part is no longer available, you must order upgrade kits
NOTE 2: Service carrier units built after 7/1/96 are built with 129425 Piston Covers and include a new selector switch.
Piston Cover Upgrade Kits
Kit Contents
Description 508289 508290 508291 508396
Selector Switch - 14 MM 129035 129035 129035 129035
Nylon Washer 129034 129034 129034 129034
Piston Cover* 129425 129424* 129425 129425
Wiring Harness 129047 129047 129046 129044
Cover Gasket 128643 128643 128643 128643
*Cover 129424 and 128612 have metric threaded airline hole for GMC applications.
Wiring Harness Usage by OEM
Wiring Harness Part Numbers
OEM Before 7/1/96 After 7/1/96 Notes
Volvo, GMC, Navistar 128481 129047 Item 5 Pg 18
Kenworth, Peterbilt
Western Star, Freightliner 128146 129044 Item 3 Pg 18
Ford
Mack 128445 129046 Item 4 Pg 18