Re-gearing help - 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 11-05-2010, 07:52 PM
Emergency Services
 

Join Date: Mar 2009
Location: Katy, Texas
Posts: 1,593
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Re-gearing help

Not sure if this is the right sub-forum.

My truck is currently running the stock 3.73's (pretty sure) but i want to re-gear before the summer. I want gears that are ideal for 40" tires because that's my ultimate goal with the truck. What would be the optimum ratio?

Thanks
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-06-2010, 06:43 PM
Banned

 

Join Date: Aug 2010
Location: reppin da 615
Posts: 1,919
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
here is a good formula (40/31) X 3.73 = 4.81 so a 4.88 or a 4.56 would be your best bet
Reply With Quote Quick reply to this message
  #3  
Old 11-06-2010, 06:59 PM
Powerstroke.org Sponsor

 

Join Date: Oct 2006
Location: Ventura County, CA
Posts: 20,356
Thanks: 23
Thanked 24 Times in 15 Posts
Feedback Score: 2 reviews
Send a message via AIM to Raul@Stealth Automotive
i had 4.30 with 40" tires and wished i had gone 4.56....
Reply With Quote Quick reply to this message
  #4  
Old 11-07-2010, 10:07 AM
Emergency Services
 

Join Date: Mar 2009
Location: Katy, Texas
Posts: 1,593
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
So 4.56 or 4.88's? They seem pretty similar in ratio, so should I just go for the 4.88's to be safe?

Is this a DIY job at home or would it be safer to have a professional do it?

Where do i buy new gears at?
Reply With Quote Quick reply to this message
  #5  
Old 11-07-2010, 10:25 AM
Compression Ignition Addict
 

Join Date: Mar 2008
Location: Santa Rosa, CA
Posts: 1,348
Thanks: 0
Thanked 4 Times in 4 Posts
Feedback Score: 0 reviews
Quote:
Originally Posted by Shooter04 View Post
So 4.56 or 4.88's? They seem pretty similar in ratio, so should I just go for the 4.88's to be safe?

Is this a DIY job at home or would it be safer to have a professional do it?

Where do i buy new gears at?

I would go 4.88's definitely!
If you have never set up gears then you better have a shop do it! To set them up correctly requires some special tools to get the tolerances just right so they will last.
Reply With Quote Quick reply to this message
  #6  
Old 11-07-2010, 10:30 AM
Powerstroke.org Sponsor

 

Join Date: Oct 2006
Location: Ventura County, CA
Posts: 20,356
Thanks: 23
Thanked 24 Times in 15 Posts
Feedback Score: 2 reviews
Send a message via AIM to Raul@Stealth Automotive
i would go with 4.56... and def not a DIY thing... let the prof do it.. i can get you the gears and install kits but an install shop is going to charge you at least 250.00 per axle to change the out....
Reply With Quote Quick reply to this message
  #7  
Old 11-07-2010, 10:50 AM
Powerstroke.org Rookie
 

Join Date: May 2010
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I had the same question. I have 37's and the stock 3.73's. I used a ratio calculator and found that 4.30's would bring me back to about the same ratio as the 33's with 3.73. Is there a brand you should look for?
Reply With Quote Quick reply to this message
  #8  
Old 11-07-2010, 10:58 AM
Emergency Services
 

Join Date: Mar 2009
Location: Katy, Texas
Posts: 1,593
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Quote:
Originally Posted by GregsSD View Post
I would go 4.88's definitely!
If you have never set up gears then you better have a shop do it! To set them up correctly requires some special tools to get the tolerances just right so they will last.
Why 4.88's over 4.56's?

Quote:
Originally Posted by Raul@Stealth Automotive View Post
i would go with 4.56... and def not a DIY thing... let the prof do it.. i can get you the gears and install kits but an install shop is going to charge you at least 250.00 per axle to change the out....
And why do you say 4.56's over 4.88's?

Yes i may take you up on the ordering from you. I can't seem to find them online. How much do you sell them for? And i have Innovative diesel here in Houston that i already talked to about doing it and they can.
Reply With Quote Quick reply to this message
  #9  
Old 11-07-2010, 11:05 AM
Powerstroke.org Sponsor

 

Join Date: Oct 2006
Location: Ventura County, CA
Posts: 20,356
Thanks: 23
Thanked 24 Times in 15 Posts
Feedback Score: 2 reviews
Send a message via AIM to Raul@Stealth Automotive
well i ran 40's on 4.30 and wished they were a tad bit lower... and i have been in trucks with the same size tires and 4.56 and they are just too low... you want something that will still let you be around 2krpm at 70mph.. the 4.56 will be to low for that... if you did those it would be great for stop and go but at highway speeds your going to be at around 2200 at 70mph

-Raul
Reply With Quote Quick reply to this message
  #10  
Old 11-07-2010, 11:07 AM
Compression Ignition Addict
 

Join Date: Oct 2010
Location: Los Gatos, CA
Posts: 418
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
i agree. i did the calculations for my 37's and it came out to be 4.45. so should i go with 4.30's or 4.56's
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:
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 12:38 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