Do I have 3.73 or a 4.10 rear end? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 05-31-2010, 12:36 AM Thread Starter
PSN Local
 
Join Date: Dec 2007
Posts: 100
Do I have 3.73 or a 4.10 rear end?

Just bought a 2000 Dually with 215/85/16 tires and at 70 mph it turns around 2100 RPM. The guy I bought it from says it is a 3.73 rear, does this sound right?
jsmith is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 05-31-2010, 12:44 AM
id: 5520
Guest
 
Posts: n/a
Re: Do I have 3.73 or a 4.10 rear end?

Quote:
Originally Posted by jsmith View Post
Just bought a 2000 Dually with 215/85/16 tires and at 70 mph it turns around 2100 RPM. The guy I bought it from says it is a 3.73 rear, does this sound right?
Yup that sounds about right..
post #3 of 4 (permalink) Old 05-31-2010, 12:53 AM Thread Starter
PSN Local
 
Join Date: Dec 2007
Posts: 100
Re: Do I have 3.73 or a 4.10 rear end?

Thanks for the confirmation.

Old Truck - 2002 F-250, 7.3 L, CC, 4x4, Regulated Return, Dual HPOPS, Garrett BB turbo, Fass 150, DP tuner 6 position chip and lots of other small mods.

New Truck - 2000 F-350 (290K), 7.3 L, Ext. Cab Dually - Stage I's, Garrett 38R, Adrenaline, ITP tank Mods and the rest of the basic stuff.
jsmith is offline  
 
post #4 of 4 (permalink) Old 05-31-2010, 02:05 AM
Yeah, it's like that
 
ducatirider944's Avatar
 
Join Date: Jul 2009
Location: Right Wing, Midwest
Posts: 2,419
Re: Do I have 3.73 or a 4.10 rear end?

You would have a 4R100 tranny with a final drive ratio of .71:1. 215/85/16 have a Dia. of 30.39" with a circumference of 95.425" which tells you that your tire has to rotate 663.98 times so at 60 MPH your engine rpm would be 1758 with 3.73 (663.98 x 3.73 x .71) or 1932 with 4.10 (663.98 x 4.10 x .71) Now we need to figure at 70. We have a known at 60 which is 85.7% of 70. So with 3.73 you would be at 2051 (1758/.857) or 4.10 would be 2254 (1932/.857)

You have 3.73 gears which is kinda odd for a dually at least every one that I have owned.

Entrepreneurs and their small enterprises are responsible for almost all the economic growth in the United States.
Ronald Reagan
ducatirider944 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the PowerStrokeNation : 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










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