What are the normal RPM's at 65 mph for a bone stock Dura/Allison combo?
How about 70, 75, etc...?
I noticed I was about 2,000 at 65 mph. This seems high to me, I seem to remeber being lower with my 8.1L big block, Allison, and 4.10 gears.
I thought diesels ran at much lower RMP's!?
Is this normal or is my tranny not going into overdrive? It seems to be though
thanks
Enthusiast
It would depend somewhat on your tire size and load as well, but is seems that I run around 2200 at 75mph unloaded with 235/85/R16's which are a litte taller than stock(overall gearing would be a little higher). I expected the rpm's to be lower as well, but this seems to be close to what you are getting.
2004 Silverado 2500HD D/A
Crew cab
4x4
Long bed
Red(of course)
Uniroyal Liberator A/T 285/75/16's
Bilsteins
Edge Juice w/Attitude
2003 CRF450-mine
2004 CRF150-wife
2003 XR70-daughter
2001 XR50-son
Yeah, we like the Hondas
Enthusiast
I have a bone stock 2001 D/A. At 65 mph, my rpm's are around 2000. At 70 mph, it's around 2100, and at 75 mph ( and i run here a lot) it runs around 2250 rpm's. You sound ok to me. Keep driving and grinning.
Enthusiast
I run about 2000 rpm @65 and 2250 @ 75 also, however, you may not be running these exact speeds. When i checked my speedo with the stock tires, It was off about 4 mph @ 75. However, your rpm does seem about right for 3.73 gear.
03 K2500 Ext SB LT 6.6 alli, UNI filter, 265/75 Bridgestone Deuler AT, Predator Flash, 4" Full System, GFS WVO Kit (Runs On Veggie)
95 SUB K2500 6.5TD, 265/75 Bridgestone Dueler AT, Transco Shift Kit, Air box mod. & K&N, 2.5 Crossover & 3" Open exhaust, Autometer EGT, Boost,&Trany Guages, Dr Lee's Battery Post Fix, PMD Cooler SOLD 02/05
Somebody's off, mine runs approx 2050 rpm's at 70 mph, 65 mph = 1800ish, 55 mph = 1450 or so, 75 is somewhere around 2225 or 2250 best I remember.
Driveshaft thats about where mine runs at. JD
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