Ford Powerstroke Diesel Forum banner

1 - 13 of 13 Posts

·
Registered
Joined
·
279 Posts
Discussion Starter · #1 ·
I have a early 99 3.73 gear. My ? is empty what is a normal rpm for running 70 mph on level ground. Mine is 2000 just wondering if that is right. Thanks
 

·
Registered
Joined
·
1,744 Posts
thats exactly what im running at 70mph, 2000 rpm.
 

·
duct tape & zip ties
Joined
·
10,761 Posts
Mine runs at 2,000 as well at 70mph, and I hae 3.73 gears also. With the an OBDII scanner hooked up it says goes from 1800-2100 while cruising at 70. But the tach was steady at 2000
 

·
Registered
Joined
·
198 Posts
Im off then, perhaps differnt gears?

going 70, im usually at 2100 rpm.....

2000 rpm i going 67.

Whats up with that?
 

·
duct tape & zip ties
Joined
·
10,761 Posts
Im off then, perhaps differnt gears?

going 70, im usually at 2100 rpm.....

2000 rpm i going 67.

Whats up with that?
I'm gonna say you have 3.73 gear ratio. Just because the tach is reading a little high doesn't mean nothing. Now if it was reading 2500 or higher then I would say it is gear ratio.
 

·
Registered
Joined
·
55 Posts
Im off then, perhaps differnt gears?

going 70, im usually at 2100 rpm.....

2000 rpm i going 67.

Whats up with that?
Do you have taller tires than stock?
 

·
Registered
Joined
·
279 Posts
Discussion Starter · #9 ·

·
Registered
Joined
·
55 Posts
I'm right at 2000 at 70MPH, but the speedo says 65MPH cause i never had the speedo recalibrated for my 35x12.50R16's
 

·
Powerstroke Junkie
Joined
·
8,308 Posts
3:73 = 70mph @ 2000 rpm's

4:10 = 63mph @ 2000 rpm's


If you have changed tire size your spped verses rpm can be anything!!!

NCH
 

·
Registered
Joined
·
279 Posts
Discussion Starter · #12 ·
Thanks for all the feed back. But i still think my truck isnt right or thes early 99s are just that much of a dog. Its always felt like its pushing a house. Or driving with the PB on.
 

·
International Threat
Joined
·
13,087 Posts
Thanks for all the feed back. But i still think my truck isnt right or thes early 99s are just that much of a dog. Its always felt like its pushing a house. Or driving with the PB on.
120 cc injectors :nod:
 
1 - 13 of 13 Posts
Top