TM 9-2520-246-34-1 2-18. WEAR LIMIT INSPECTION (MODEL T-136-27). The following paragraphs give the minimum and maximum wear limits for each subassembly to which a part or parts may be worn before a new part is needed. a. Low Range Shifter Shaft Assembly. FRAME 1 NOTE Readings must be within limits given in are not within given limits, throw away 1. easure diameter of shifter shaft (1). 2. Measure width of groove in shifter fork (2). END OF TASK table 2-15. If readings part and get a new one. Index Number 1 2 Table 2-15. Low Range Shifter Shaft Assembly Wear Limits Item/Point of Measurement Low range shifter shaft outside diameter Shifter fork groove width Size and Fit of New Parts (inches) 0.9945 to 0.9955 0.712 to 0.720 Wear Limit (inches) None 0.7400 2-175