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Brandy new (just over a hundred miles) 579 4 axle 13 spd daycab (thru PacLease). Shifting from 4th to 5th (low range to high) will get hesitation for engagement. Will sometimes get into 5th without it engaging and rev engine. Have attempted to ensure I pre-select in 4th (other trucks I drive that have been around the block a few hundred thousand times let me select/shift no problem) before coming out of gear and into 5th.
Doesn't happen all the time, but still once or twice more even when I am trying to pay attention and not fall into usual shifting habit. Question is is this a new truck it will work out thing, or is there a possible hang-up with the air line supply?

Thanks in advance for any assistance.

 

New trucks are usually slow to split/ range shift. Sometimes they can take a couple seconds for the first ever shift. Give it another hundred miles to break in. Try pausing in nuetral to make sure you hear the clunk before enganging 5th.
If the problem doesnt get better take it to the dealer, could have an air regulator issue. More then likely just needs to be broke in though.

 

Thank you for the reply pushbroom! Will let it ride and try to give it an extra half a second in neutral. Truck does not get driven everyday so it'll be awhile before I know what's going on.

 

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Ugh, thanks

 

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