Gear Ratio
10-10-2005, 06:04 PM
#1
Registered
Thread Starter
Join Date: Jul 2005
Posts: 88
Likes: 0
Received 0 Likes
on
0 Posts
Gear Ratio
I have a Ford Expedition with a 5.4L 4x4 that is rated for a 6600 pound trailer with the differential ratio of 3.55 .
I have been thinking on changing my differential ratio for either a 3.73 or a 4.10.
As it is, when my speed is 100 KMH the RPM is about 1450.
What would be the RPM and the max that I could tow with these two differentials ?
Thank you
I have been thinking on changing my differential ratio for either a 3.73 or a 4.10.
As it is, when my speed is 100 KMH the RPM is about 1450.
What would be the RPM and the max that I could tow with these two differentials ?
Thank you
10-10-2005, 06:20 PM
#2
Re: Gear Ratio
I think the highest tow rating available on an excursion with the 5.4 is 7200 LBS. With the 3.73's you would be runnning 1525 RPM at 100 KMH with the 4.10's you would be running 1675 RPM at 100 KMH.
10-10-2005, 07:50 PM
#3
Registered
Thread Starter
Join Date: Jul 2005
Posts: 88
Likes: 0
Received 0 Likes
on
0 Posts
Re: Gear Ratio
I thought that was the figure that would come out, but isn't there some other figures to take in consideration when changing a differential ratio.
With a 4.10 ratio is the max trailer weight still the same ?
With a 4.10 ratio is the max trailer weight still the same ?
10-11-2005, 10:56 AM
#5
Registered
Re: Gear Ratio
The 3.73 gear is only 5% different.
The 4.10 is 15% higher.
Are you looking for better acceleration or just better pulling power.
Try pulling in 3 (drive) not OD.
Wannabe
The 4.10 is 15% higher.
Are you looking for better acceleration or just better pulling power.
Try pulling in 3 (drive) not OD.
Wannabe
Thread
Thread Starter
Forum
Replies
Last Post
saulesses
Prop Talk
1
06-13-2007 09:12 PM
saulesses
Prop Talk
0
06-11-2007 11:01 PM
