Did you know that there was a change to the input shaft in the Allison LCT 1000?
In model year 2017, the shaft went from 25 to 26 splines. The 25-spline version has splines that extend all the way to the tip of the shaft. The 26-spline version has a smooth tip at the end of the shaft.
Another quick way to verify which shaft you have is to take a caliper measurement of the spline O.D. The caliper will show approx. 1.273" for the 25-spline version and 1.320" for the 26-spline (Figures 1 & 2).
|Figure 1 – Shaft Spline Comparison|
|Figure 2 – Measure Splines with Caliper|
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