Looking to build one of my trucks to this spec 455 egr 12.7 Detroit 18 speed (ran in 17th, first overdrive) 2.93 rears Lo pro 22.5s To be able to cruise at 68-70 at around 1475rpm working south eastern área not many mountains but may head west from time to time. What experience do you guys have with the 2.93 rears? What about in hills
What's under the hood determines the speed you pull the hill. Taller rears just means you gotta drop more gears in the transmission to compensate.
455 egr 12.7 was a dud the pre egr 12.7versions were ok but weak from the lower torque . Driven correctly a 500 hp pre egr is hard to beat
Some time we will have to start a conversation of the term ''tall'' gears and ''short'' gears and the implications of each in a technical sense. Maybe not.
I had 2.93's with a 12.7 470 detroit and a 13spd. Never had any issues pulling hills or on take off, never had to drop to many gears to pull a hill either. Ran 48 and Canada with it pulling refers, tanks, roll offs and step deck.
The number of gears changed depends on where you started from. a double overdrive will change 2 more gears than a direct for example. That's not exact science but-------
I used to run a 12.7/13spd/2.73/lo pro combo that was great. The engine put 550ish to the tires on a dyno at the time it was rebuilt so it was very healthy. Would have been an 8mpg truck if Id have ran 65 and not 70-72.
