RPM question

[Felix Sordo]

I'm new to the Sport Trac, so i'm not sure of my RPM. I have a 2001 Sport Trac 4L, 2WD, original tires/wheels, bought it used. On the highway at 80mph my RPM is 3000. is that correct it seems high to me. My wife has a 2003 Explorer with the same set up and at 80 mph the RPM is only 2100. What do you guys think?

 

[Todd Z]

I Know at 65 my st is around 2200 RPM.... So 3000 at 65 sounds right....



IF you have the 4:11 rear end or the 3:73 rear with 15 inch tires your RPMS can be high...



I believe the explorer only has 3:55 gears so that can do it right there...



Todd Z

 

[Woppy V]

Yep. 80mph = 3000rpms for me also. Scary knowing how much u are eating as ur drive huh? :wacko: And I have the 4:11 rear diff.

 

[Mike Wilson]

2005 here, @ 70 m.p.h., my tach is at about 2300 w/ 3:72 rear end.



P.S.... 16 inch wheels

 

[Johnny O]

A 2001 4x2 likely has 15" wheels, so 3000 rpm at 80 mph sounds about right.

 

[Felix Sordo]

Hey guys thanks for the education. It has 16" Ford rims w/ Goodyears so i guess they are std. Is there any way of figuring out what the gear ratio is.

Also does anyone have any ideas on knocking that RPM down on the highway?

 

[Todd Z]

Dirt



Look on the drivers door or door jam.

Code Axle

46 — 3.73 non-limited slip

42 — 4.10 non-limited slip

D4 — 3.73 limited slip

D2 — 4.10 limited slip





Todd Z

 

[Woppy V]

LOL go slower.... also do a search for the codes about ur gear ratio with the vin number.