Shifting a detroit

Too many variables. Just drive it and feel it out.

 

I up shift in low range about 13 and high range at 14 usually wind it up to 15 to go into 10th downshift iat 1000 is ok and it won't shift fast about a second between getting it out of gear and into next one .... those rpms is what Detroit recommend for fuel mileage .. there some variables as to weight of load uphill or downhill .... up higher down lower but doesn't take long to learn

 

Usually 1500 is the sweet spot

 

Is it a pre-egr? If so, low range is good at around 1,000. 6th, start winding it to about 1,300 and wind it about 100 more each gear. By the time you're shifting into 10th, you'll want to be picking it up at least at 1,300. On a 10 speed that would mean no less than 1,700 in 9th.

If it's a 14, then you can shift it more like your cat.

 

The RPMs drop only as fast as you let them. You don't have to jump off and onto the throttle ya know. Ease off only as far as you need to and ease back on and your shifting will probably improve.