37's with 4.10's or 4.30's???? - Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 10 Old 03-07-2013, 04:31 PM Thread Starter
Compression Ignition Addict
 
Ford Cowboy's Avatar
 
Join Date: Sep 2010
Location: Texas
Posts: 427
Thanks: 5
Thanked 11 Times in 11 Posts
Mentioned: 1 Post(s)
Quoted: 4 Post(s)
Feedback Score: 0 reviews
37's with 4.10's or 4.30's????

Ok, I have a 2000 f350 7.3l srw with 3.73 gears. I wanna do a 6" lift with 37's. I understand that if I keep the 3.73's with the 37's the truck would be sluggish,my mileage would suck, and my rpm's would be through the roof. I get very good mileage now, and I wanna keep it like that. I also would like to keep my rpm's as low as possible. So, which gears would give me the best results (mileage, rpm's, power etc.) 4.10's or 4.30's???? Thanks for any help or suggestion y'all have.
Ford Cowboy is offline  
post #2 of 10 Old 03-07-2013, 04:49 PM
Compression Ignition Addict
 
AnthonyU's Avatar
 
Join Date: Sep 2009
Posts: 211
Thanks: 0
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Feedback Score: 0 reviews
You should be fine with the 4.10's the 4.30's will be to much
AnthonyU is offline  
post #3 of 10 Old 03-07-2013, 04:50 PM
Compression Ignition Addict
 
Wyofordpower's Avatar
 
Join Date: Jun 2012
Posts: 161
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 0 reviews
I'd say 4.10's if you dont plan on towing anything. My 97 has 4.10 with stock tires for towing and it doesnt get great mileage but it pulls off the line like a machine, but adding 6 inches of tire is going to knock down acceleration alot.
Using the second calculator on this site gives 4.45 as the new ratio to keep the same rpms, so I'd think that 4.30's would be best overall.
Calulators from www.4Lo.com
Wyofordpower is offline  
post #4 of 10 Old 03-07-2013, 05:01 PM
Compression Ignition Addict
 
Tj Krawler's Avatar
 
Join Date: May 2010
Location: Western New York
Posts: 958
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by Ford Cowboy View Post
Ok, I have a 2000 f350 7.3l srw with 3.73 gears. I wanna do a 6" lift with 37's. I understand that if I keep the 3.73's with the 37's the truck would be sluggish,my mileage would suck, and my rpm's would be through the roof. I get very good mileage now, and I wanna keep it like that. I also would like to keep my rpm's as low as possible. So, which gears would give me the best results (mileage, rpm's, power etc.) 4.10's or 4.30's???? Thanks for any help or suggestion y'all have.

I believe 4.30s with 37s will be close to the same RPM as 3.73s with stock size tires. IMO, 4.10s aren't a big enough difference from the 3.73s to be worth the cost.

Personally, I would try it with 3.73s and 37s and see how you like it. If you tow a lot or heavy, I'd go with 4.30s. Maybe even 4.56s if you tow all the time or really heavy.

3.73s with 37s at 70 would be just under 1700 RPM.
4.10s with 37s at 70 would be 1850 RPM
4.30s with 37s at 70 would be just over 1900 RPM
4.56s with 37s at 70 would be 2050 RPM

Alan
2000 F-350 CC LB DRW 4x4 XLT Auto

- Intake
- Exhust
- ScanGauge
Tj Krawler is offline  
post #5 of 10 Old 03-07-2013, 05:03 PM Thread Starter
Compression Ignition Addict
 
Ford Cowboy's Avatar
 
Join Date: Sep 2010
Location: Texas
Posts: 427
Thanks: 5
Thanked 11 Times in 11 Posts
Mentioned: 1 Post(s)
Quoted: 4 Post(s)
Feedback Score: 0 reviews
I was kinda leanin towards the 4.10's. Once in a blue moon do I tow with this truck. I mainly run on the highway and want the best mileage I can get with a 37" tire. If theres anybody out there runnin 37's with 4.10's or 4.30's I'd love to know ur mileage and rpms at highway speeds (65-70). Thanks. I currently run like a hair over 2000 rpm at 70 mph with stock 265/75r16's.
Ford Cowboy is offline  
post #6 of 10 Old 03-07-2013, 06:16 PM
Compression Ignition Addict
 
Joel's Avatar
 
Join Date: Oct 2008
Location: Abbotsford
Posts: 2,725
Thanks: 29
Thanked 125 Times in 113 Posts
Mentioned: 1 Post(s)
Quoted: 10 Post(s)
Feedback Score: 0 reviews
Go ahead with the lift and tires. Many people have run 37's with stock gearing. Try it for a bit and if you hate it you can always change after.
No sence spending more money than you have to.

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
Quote:
Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
Joel is offline  
post #7 of 10 Old 03-07-2013, 06:23 PM
Compression Ignition Addict
 
Jerrybizzle's Avatar
 
Join Date: Feb 2013
Location: Meridian, Idaho
Posts: 364
Thanks: 18
Thanked 8 Times in 8 Posts
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
Feedback Score: 0 reviews
Your best highway mileage with 37s will be the 3.73. The place mileage would suffer with 3.73s is city driving due to more mass to get started. On the highway your rpms will be lower with 3.73 resulting in best mileage

2012 f250CCLB, 285/70/17 on vtec wheels
Mini maxx, weight reduction pipe, egr block plates (to be installed)
Jerrybizzle is offline  
post #8 of 10 Old 03-07-2013, 06:24 PM
Compression Ignition Addict
 
Wyofordpower's Avatar
 
Join Date: Jun 2012
Posts: 161
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 0 reviews
Quote:
Originally Posted by Joel View Post
Go ahead with the lift and tires. Many people have run 37's with stock gearing. Try it for a bit and if you hate it you can always change after.
No sence spending more money than you have to.
I totally agree, but you are going to want the new gears after you lift it, unless its just a show truck.
Wyofordpower is offline  
post #9 of 10 Old 03-07-2013, 06:29 PM
Compression Ignition Addict
 
timmyboy76's Avatar
 
Join Date: Aug 2010
Posts: 1,891
Thanks: 0
Thanked 20 Times in 20 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
i'm with Joel and JerryBizzle, on this one...

99.5 x-cab 7.3l, 6spd, 161k miles.....
timmyboy76 is offline  
post #10 of 10 Old 03-07-2013, 06:29 PM
Compression Ignition Addict

 
gabegoforth's Avatar
 
Join Date: Feb 2013
Location: Valley, WA
Posts: 978
Thanks: 1
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Ive got 4.10s with 38s. Ive towed 22k a couple of times and 20k more. I just stay out of overdrive on the hills.

1996 F-350 Crew Cab 4x4, Auto, Toyo MT 315/65/16r, full force 160/30% injectors, Super Duty electric fuel system, RiffRaff regulated return, Driven diesel electric fuel pump controller, SWAMPS HVHF IDM, custom tuned TS chip, 1.0 Turbo, CX Intercooler, 4" Exhaust, 6637 Intake, 4.10 Gears, 225k+ miles.
gabegoforth 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