when im goin do the highway doin about 70-75 my RPM is run at 3k that seems kinda high cause my girlfriends 1500 at 80mph is at 2k so i was wondering if 3k is normal thanks guys

 

I see you have 32's on your truck, did you re-gear, if not, what gear do you have? I run 2500 rpms at 80, but I have 30" tires with a 3.42 gear ratio. In any event, it doesn't seem high to me...

 

i ran about 3500RPM at 70-75mph, with stock 4.10's and 35in tires.. but that was with the O/D OFF

 

it all has to do with what gear is in your, mine has the 4.10 rear end and at 70 im doin 2500..which to me is hummin pretty good..but like my dads F150 has the 3.55 rear end that thing is like 1800 at 70 so it all has to do with your rear end.

 

I've got 4.10's, 5 speed manual, 3.0L, 31's. I turn 3,000 - 3,200 at around 90.

 

I don't see how thats possible when I have tires that are less than 1" smaller than you with a 3.42 gear ratio running 2500rpm at 80. I don't see any way you could be going 10 mph faster with that much more gear and only 5-700 rpms higher. (I have a manual as well)

 

I have 4.10's and an automatic and my speedo tops out at 93 which is 3200 RPM.

 

Really? Wow, that just seems off to me, but eh, what do I know....lol.

 

i have 4.10's but it kinda feels like im in third gear and it want to go into 4th but just woulnt

 

im at about 2600 at 70 with my 3.73's

 

3.42?? you mean 3.55

for me 65 is like 2200, but that is 4.56s and 4.88s

and for the OP, you are comparing apples to oranges. v6 needs more rpm to create the same amount of torque that the v8 is putting out. i think the amount of rpm for that speed is fine.

 

i got 4.10s with stock tires 235s and im runnin about 3k at 75 3.0

 

Well yes and no.... My stock gear ratio is 3.55 but with my larger tires, it is a 3.42.

 

I'll get video of it for you.

 

Your axle ratio won't change because of different tires. Your final drive ratio will be affected and might change relative to stock tires, but I think that's a rather confusing way to look at it.

 

ive got 235/75/15's with 3.73 gears and 80 is just about 3000

 

31's and 3.73's i do 2200-2300 rpm at 75 mph and at 80 its 2500 rpm

 

i've got 31.5" w/ a 4.56 rear end. when my odometer say 70 (really about 63mph) i'm at 2700ish.

 

70mph 33's and 4.10's I am at 2600-2700

 

follow this link. its a video or my trucks speedo. I know its not a great shot but you all know what you speedo says and thats 85-90 at 3,000

 

heh you better throw up some video then!

 

i run ~3k at 70mph with 3.73's and 31's.
but my speedo is off so im going to guess 70 is around 80ish.

 

mine was the same before i blewout my rear end and got 4.56 gears. i gotta get rid of my speed limiter. my top speed is now what? like... 80ish? driving fl turnpike all the time, that doesnt always follow flow of traffic. can anyone vouch for me?

 

Sorry for the missed link I don't know what I was thinking. Its ****ty quality but its a Camera phone so oh well.

http://videos.streetfire.net/video/7...b90108d0b9.htm

 

5speedin - does your truck feel like its struggling too much with the 31's? ive been thinking about moving up to them, but im driving on hills a lot and i dont want to lose too much, especially in the winter.