Gears!

[SpeedyLube202]

When im cruising at 70 mph my rpms are at about 3200. Does that mean i have 4.10s or what? Its a 5 speed manual. Also my boost gauge used to sit at 5 psi at that rpm but now it sits at about 3psi. What does that mean?

[fordfan30]

4.10 should put you at or about 2300 but 3200. wow thats geared low. 5.13 maybe? are the tires stock size? i assume your are in 5th and not 4th also. running 1 to 1 in forth you can use the calculator to find out your gears. i believe randys ring and pinion has one on thier site. maybe one on here also but i dont know.

[1badpsd]

yea somthin aint right with that i had/have 4.10's in both my trucks and at 75 it should be right at 2500 rpms

[97powerstroker]

sounds like your in 3rd gear with those r's,thats messed up,your prolly bouncin off the rev limiter.id figure it out quickly.

[SpeedyLube202]

No i can make it bounce off the rev limiter at like 95 mph.

[95dieselsmoke]

wow. 3200! i bet your truck doesnt like that at all

[Hardline]

Yup sounds right. I have 4.10 with the 5 speed in my truck. My truck is almost always running over 3 grand. If I remember correctly, 65MPH is like almost 3K. JJ

[blazeproc]

That sounds wrong, My truck runs at 2500 at 70 to 72 and its 4.10 with a five speed. I dont see 3000 until I reach 80 to 82

[95dieselsmoke]

Originally Posted by blazeproc

That sounds wrong, My truck runs at 2500 at 70 to 72 and its 4.10 with a five speed. I dont see 3000 until I reach 80 to 82

this sounds more acurate to me^^^^^^

[Hardline]

I will try to get my old truck back out tomorrow and run it down the road. I have not driven it in about a month so I am not absolutly sure but mine seems to run high RPMs from what I remember. JJ