Synchronizer Assembly Fastener Change
Mack implemented a revised fastener (Part No. 551KC216) into production effective November 28, 2007, on the synchronizer assembly used on its T200 and T300 transmissions, as shown in Figure 1. This revised fastener incorporates Scotch-Grip adhesive, replacing the patch-lock type fastener which was used previously.
If you disassemble the synchronizer assembly, use the revised fastener at reassembly. Tightening torque specification remains the same.
These fasteners are one-time use fasteners. They must be replaced anytime the synchronizer assembly is disassembled.
Changes to Helical Thrust Washer
Dana has made design changes to the helical gear thrust washer and wheel differential cases on the following models: DS/RS344, 404, 405, DSP/RSP41, DST40, DST41, DSH40/RSH40, DSH44/RSH44, 17/19/21/22060S and 22060SH.
These new design features enhance the overall performance of each segment of the axle the parts are located in (power divider section and wheel differential section). The change was implemented in production units starting in mid-2007.
The original design parts and new design parts are 100 percent interchangeable. All kits sold through service containing the original parts will move to the new design parts as individual inventories are depleted.
The helical gear thrust washer change took place August 20, 2007. The 128702 thrust washer, located in the power divider section of forward carriers, is replaced by washer Part No. 132439. The new washer is common in design to the washer featured in the company’s 46K models. It is easily identifiable by the increased surface dimension and the change in the design of the lubrication groove.
