4:11 vs 3:73 - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-19-2012, 06:25 PM
Super Moderator


 

Join Date: Dec 2009
Location: Florida
Posts: 1,977
Thanks: 11
Thanked 4 Times in 4 Posts
Feedback Score: 0 reviews
4:11 vs 3:73

How bad a drop in mpg can you expect with 4:10 gears vs 3:73?

Sent from my DROID RAZR using AutoGuide App
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-19-2012, 06:30 PM
NOT a Democrat
 

Join Date: Oct 2009
Location: Robinson Twp PA (Pittsburgh)
Posts: 4,506
Thanks: 2
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Send a message via AIM to Galaxie
You thinking of a swap? Not horrible. Mathmaticly speaking its not a huge spread. Really, IMO not enough of a spread to do a swap. Totaly different bird but in a Mustang of mine I went from 3:08 to 3:55 to 3:73 to 4:10 back to 3:55 (over many years). Saw zero change from 3:73 to 4:10. Really was just changing for MPH and RPM and trap speed siturations.

My 7.3 had 4:10s and got over 20 MPG but it was a stick 4x2.
Reply With Quote Quick reply to this message
  #3  
Old 11-19-2012, 06:44 PM
Premium Member
 

Join Date: Aug 2009
Location: Somewhere Between Good and Bad
Posts: 1,335
Thanks: 3
Thanked 10 Times in 10 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by LFD132 View Post
How bad a drop in mpg can you expect with 4:10 gears vs 3:73?

Sent from my DROID RAZR using AutoGuide App
Depends upon tire size, and the % change from stock. If your new tires are 5% larger than stock, then you need about 5% change in gearing to return you to the factory "tire size/axle ratio", assuming that worked well for you.

From the photo in your post it looks like your truck has 37s. Assuming you plan to stick with that size (and weight) of tire, you might want to consider 4.56s.
Reply With Quote Quick reply to this message
  #4  
Old 11-19-2012, 06:50 PM
Super Moderator


 

Join Date: Dec 2009
Location: Florida
Posts: 1,977
Thanks: 11
Thanked 4 Times in 4 Posts
Feedback Score: 0 reviews
Another story, but I'm considering going back to a 6.0 and the truck I'm looking at is stock with 4:10 , gears. The biggest i would go with tires on it would be 35's.

Sent from my DROID RAZR using AutoGuide App
Reply With Quote Quick reply to this message
  #5  
Old 11-19-2012, 07:28 PM
Premium Member
 

Join Date: May 2012
Location: Anchorage
Posts: 1,185
Thanks: 16
Thanked 25 Times in 21 Posts
Feedback Score: 1 reviews
IMHO 4.10s or 4.30s and 35s is the best combo.
Reply With Quote Quick reply to this message
  #6  
Old 11-20-2012, 03:56 PM
Premium Member
 

Join Date: Aug 2009
Location: Somewhere Between Good and Bad
Posts: 1,335
Thanks: 3
Thanked 10 Times in 10 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by snafu! View Post
IMHO 4.10s or 4.30s and 35s is the best combo.
That's what I was thinking...
Reply With Quote Quick reply to this message
  #7  
Old 11-20-2012, 06:09 PM
Compression Ignition Addict
 

Join Date: Sep 2010
Location: Delaware
Posts: 791
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
4.10 should have been the stock gear and 4.30 for the trucks equipped with the 20" wheels with 34" tires.

I'd get the 4.10 truck.

Jason
Reply With Quote Quick reply to this message
  #8  
Old 11-20-2012, 06:12 PM
Super Moderator


 

Join Date: Dec 2009
Location: Florida
Posts: 1,977
Thanks: 11
Thanked 4 Times in 4 Posts
Feedback Score: 0 reviews
Truck was advertised as having 4:10 gears. After pulling an oasis it actually has 3:73's.
Reply With Quote Quick reply to this message
  #9  
Old 11-20-2012, 07:55 PM
Powerstroke.org Sponsor


 

Join Date: Nov 2011
Posts: 1,829
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Love my 3.73 mileage
Reply With Quote Quick reply to this message
  #10  
Old 11-21-2012, 07:54 AM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Central Texas
Posts: 712
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
4.10s all the way, it will give you that rpm right in the sweet spot, a lil more bite on acceleration and pulling trailers without really sacrificing fuel mileage. Go 4.30s if you run 37" or larger tire or if you constantly pull heavy loads, go 4.30s.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 07:38 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors