For the most part... shift points for most big engines will be close. However, if you drive a truck like ours...with the Cummins ISM's, the shift points and downshifting rpms are a little bit higher than with a big Cat, Detroit or Cummins ISX.
In my opinion....when driving a truck for the first time...you need to pop the rpm up a ways (don't floor it)...and feel for the slot. Every truck and transmission has its quirks...almost like a personality. It also depends on who broke it in, and at what rpm range they tended to work it at.
One way to find the slot is to use the clutch, pop the rpm up and control it with the fuel pedal and gently ease it to the gear...if there is resistance let the rpm drop or bump it alittle higher and find the point where it slips in. Note the rpm where it falls in. Don't do this in heavy traffic though.
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