05 super

he doesn't have an overdrive...he said 4 speed standard. he does his own shifting. i'm not sure what's going on there Sel. is your speedo or tach out of whack?

sel

weight makes a difference thats why my mustang revs so much lower then my buddys 5.0 f150 with the same gears...the more the vechile weighs the harder the engine has to work to push it....ie rev out higher....my mustang revs out at 1500rpm at 60miles per hour in 4th...less rolling resistance equalls less effort to move it....and the gears are not stock so what didnt come stock isnt an issue....cause u can get 3.08 to 5.13 or higher gears in it if u wanted to...especially it being a ex-plow truck would make sence for the gears to be around 4.56 just never drove a truck with that low of gears so im not sure if id be lower or not....hard to say...appreicate the imput though

sel

and theres nothing wrong with truck

ford fan

I would guess that the tach is off, or you have the most crazy gear set ever. I had 35s on my bronco with 3:73 and auto I would turn around 2400 at 60, so youre at almost double.

Just call me Sean

iTrader: (1)

With it being an old plow truck it is possible the gears are really low. More torque to push the truck with the heavy plow attached through the piles of snow. Plow trucks don't drive fast either, you can't plow snow at 60MPH.

sel

well if u have 35s and say 4.56s for instance....because of the the greater diameter of the wheel causing a greater duration of rotation it causes a the opposet effect of a reducer....buy that i mean the truck acts as if it has taller gears...thats why when u put them on without low gears u got no ***** and u got a high top in....some is due to the added weight but also cause of the effect....ever see someone pump the tire hard in a four wheeler when racing...same idea, rides like **** though lol

andyman7931

the best way to figure out the gear ratio is to pull the diff cover and count teeth on the gears. An easier way is to jack up the rear of the truck and put a mark on the driveshaft and one on the tire at the ground. Rotate the tire one revolution while counting the revolutions of the driveshaft.

the weight of the vehicle has absolutely nothing to do with revs at speed. It's all gear ratios in the transmission, axles and tire size.

ford fan

either your tach is off or you have a 7.12 gear ratio. Or you have your transfer case in 4low

sel

if it doesnt then why does your truck rev out higher when u put weight in the back....pull a trailer and see the revs come up

andyman7931

In the past 3 weeks I've pulled a 7000 lb trailer about 700 miles. Next week I'll pull it another 600 miles. The revs are the same whether I pull the trailer or not. My truck has a c6 transmission and going up hills it will downshift to 2nd gear sometimes which causes the revs to increase, but in 3rd gear with the torque converter locked, the truck revs the same whether the trailer is behind me or not. If yours doesn't do this, you may have transmission problems.