Axle Ratios - Ford Powerstroke Diesel Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 14 Old 09-01-2013, 04:54 AM Thread Starter
Powerstroke.org Rookie
 
Sediment's Avatar
 
Join Date: Aug 2010
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Axle Ratios

New guy here and got a question for the experienced haulers. I have an early 99 F-250 (Born on date 04/98) and am looking to change my axle ratios.

Little background on the rig. It has an 11" lift with BDS springs and Fox 2.5 shocks with reservoirs. Tires are 38" Toyo all terrains. Drivelines have been extended to meet the differentials at more normal angles. I bought the truck with an 8" lift and smaller shocks, but decided to crank it up higher since it's what I've always wanted. Yes the truck in the picture is a '99. The first owner had a '06 front clip and an '08 bed put on it. As well as plenty of goodies inside the engine compartment and inside the cab.

Anyways, I've looked at the sticker on the doorjamb telling me that it was factory installed with a C1 axle, which should mean it has stock 3.73 gearing. I was wanting to lower the ratio (higher numerically) to a 4.10.

It does have the 7.3 and I know this engine has way more power than I am feeling when pressing on the gas, obviously the larger tires are playing the major role in it. It just feels sluggish and I need to give it a good foot-full of pedal to make it accelerate at a reasonable rate. I've been reading up that swapping to 4.10 gears would provide more get-up-and-go as well as towing torque. If it ever decides to rain here in Nor Cal again I plan to play in some mud. I hardly tow anything as it is and don't use it for long highway runs. Maybe from Sacramento to Reno but that would probably be the farthest and only rarely. I'm told that if the ratio was lowered it would make this engine just scream when running at highway speeds. This motor is already pretty darn loud as it is now and I don't want to wring it's neck just for a highway cruise.

Any input if I should leave them or change them? How much would Ford or another shop charge to change the ratios in both axles?
Attached Thumbnails
Click image for larger version

Name:	Caleb.jpg
Views:	231
Size:	96.1 KB
ID:	161953  
Sediment is offline  
post #2 of 14 Old 09-01-2013, 06:02 AM
Premium Member
 
Macon's Avatar
 
Join Date: Jun 2012
Posts: 3,804
Thanks: 3
Thanked 22 Times in 22 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
If you are running 3.73 with 38's, I would definitely swap them out. 4.11 would be the highest I'd go, but you may be better served with 4.30. The difference will be ~90 RPM at 70mph, but you'll have a little better response at lower speeds. It will definitely serve you better going over the Sierra's. If you do much playing up there in the foothills, you'll like 4.30 better as well.

Randy's Ring & Pinion

*Edit*

Here's a calculator so you can crunch some numbers yourself. The "prime" cruising RPM is 1800-2200.

http://www.ringpinion.com/calculators/calc_rpm.aspx

2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637

"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."

--Thomas Paine, Four Letters on Interesting Subjects, 1776

Last edited by Macon; 09-01-2013 at 06:07 AM.
Macon is offline  
post #3 of 14 Old 09-01-2013, 08:32 AM
Compression Ignition Addict
 
Jerrybizzle's Avatar
 
Join Date: Feb 2013
Location: Meridian, Idaho
Posts: 364
Thanks: 19
Thanked 8 Times in 8 Posts
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
Feedback Score: 0 reviews
Bump to at least 4.30, otherwise don't waste your money for such a small change from 3.73 to 4.10. You won't notice much of a difference with such a small change and regearing isn't cheap.

2012 f250CCLB, 285/70/17 on vtec wheels
Mini maxx, weight reduction pipe, egr block plates (to be installed)
Jerrybizzle is offline  
post #4 of 14 Old 09-02-2013, 12:49 AM Thread Starter
Powerstroke.org Rookie
 
Sediment's Avatar
 
Join Date: Aug 2010
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Thanks for the input fellas. I looked at the site you linked Macon and there's only 2 brands for gearing USA Standard and Yukon. Any differences to know about the two? Also I saw the OEM gears are twice as much as the others, why is that?
Sediment is offline  
post #5 of 14 Old 09-02-2013, 01:00 AM
Powerstroke.org Sponsor

 
Corey@CNCFAB's Avatar
 
Join Date: Apr 2010
Location: Defiance, OH
Posts: 9,634
Thanks: 803
Thanked 531 Times in 485 Posts
Mentioned: 199 Post(s)
Quoted: 508 Post(s)
Feedback Score: 1 reviews
OEM are supposedly better quality. Just what I've read.

You can also check out JustDifferentials.com and JeffsBroncoGraveyard.com

To do both axles, labor will probably be around 10hrs plus parts. Ford dealers obviously will have a higher rate.

Sent from AutoGuide.com Free App

E99CCLB 450/400s,STG1cam, KC38R, 4" exh,CNC FAB fuel&oil lines,140vIDM,BTS,S&B

97 ECLB F250 4x4 stock
96 CCLB F350 4x4 stock



EDGE,S&B,SCT,PHP Hydra,TS-Perf,OEM parts,Sam Wyse trans,VB's,LED's,MBRP,ISSPRO,ICON,FOX,KC TURBOs,SD 7.3 fuel kits, HPOP lines

www.cncfab.us or email sales@cncfab.us

Corey@CNCFAB is offline  
post #6 of 14 Old 09-02-2013, 01:17 AM Thread Starter
Powerstroke.org Rookie
 
Sediment's Avatar
 
Join Date: Aug 2010
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Ok rookie followup question. Is this a Dana 50 axle? 60? 80? Sorry for all the questions but this is new to me and I usually like to learn about new stuff and look before I leap.
Sediment is offline  
post #7 of 14 Old 09-02-2013, 01:20 AM
Powerstroke.org Sponsor

 
Corey@CNCFAB's Avatar
 
Join Date: Apr 2010
Location: Defiance, OH
Posts: 9,634
Thanks: 803
Thanked 531 Times in 485 Posts
Mentioned: 199 Post(s)
Quoted: 508 Post(s)
Feedback Score: 1 reviews
D50 unless someone has changed it out. I think they are called a "Super 50" iirc.

Sent from AutoGuide.com Free App

E99CCLB 450/400s,STG1cam, KC38R, 4" exh,CNC FAB fuel&oil lines,140vIDM,BTS,S&B

97 ECLB F250 4x4 stock
96 CCLB F350 4x4 stock



EDGE,S&B,SCT,PHP Hydra,TS-Perf,OEM parts,Sam Wyse trans,VB's,LED's,MBRP,ISSPRO,ICON,FOX,KC TURBOs,SD 7.3 fuel kits, HPOP lines

www.cncfab.us or email sales@cncfab.us

Corey@CNCFAB is offline  
post #8 of 14 Old 09-02-2013, 01:45 AM Thread Starter
Powerstroke.org Rookie
 
Sediment's Avatar
 
Join Date: Aug 2010
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Ok good to know. The more I read the more I scratch my head now haha. Dana 50's on both front AND rear correct? Some other sites that pop up on a google search say the front was a 50 with no info on the rear. Should be the same for both right?
Sediment is offline  
post #9 of 14 Old 09-02-2013, 02:38 AM
Compression Ignition Addict
 
Lilfarmrboy's Avatar
 
Join Date: Oct 2011
Location: Delaware
Posts: 1,065
Thanks: 21
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
If you are going to "Play in the mud" and you are in the process of swapping gears you might as well throw in a Detroit E-Locker just for the hell of it. You could do both front and rear but if mud is all you are doing and not rock climbing then you could get away with a set of Truetrac's up front to save on some cost. Actually I think Eaton now recommends the M-Locker over Truetrac's. Either way you might as well look into it if you are already going to swap out gears. You won't be disappointed.

Differentials & Locking Differentials
Lilfarmrboy is offline  
post #10 of 14 Old 09-02-2013, 02:52 AM Thread Starter
Powerstroke.org Rookie
 
Sediment's Avatar
 
Join Date: Aug 2010
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Thanks for the info Lilfarmrboy. I still have a lot to learn.
Sediment is offline  
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:
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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome