I think Grant's last sentence was bang on.
If I am reading this all right, the transmission turns the speedometer cable at a constant speed with relation to the output speed of the transmission. As such, it would only be correct in one of the two axle speeds.
There is a speedometer cable adapter, with a high speed output, a low speed output, and a slight neutral in between the two.
The adjustment is made with the axle shifter centered between high and low (it's neutral), and the speedometer adapter in neutral. The cable is slipped and adjusted to provide the proper length, so when the axle shift lever is in it's center of travel, the speedometer adapter is also in neutral.
This procedure will provide an adjustment that works off the center of the possible range of movement. Trying to adjust it from the high or low position could result in an adjustment from one extreme which may not result in complete engagement to the other extreme.
That's my 2 cents worth. I am not familiar with the particular truck you are working with. Am I to assume there is an inline two speed speedometer cable adapter or is the two speed adapter built into the speedometer?
Last edited by rob love; 18-10-09 at 15:28.
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