Swap 4.10 for 3.73 gears? - Ford Powerstroke Diesel Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 15 Old 06-11-2013, 12:03 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Apr 2013
Location: Near Louisville KY
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Swap 4.10 for 3.73 gears?

I have a 99 model 4x4 dually with 4.10 gears used to tow our travel trailer. Wife wants to take the truck on a 4000 mile trip this summer. Local guy has a set of front and rear low mileage 3.73 gears for sale.

Would it be worth the time and money to swap the gears for better MPG and lower RPM on highway? Do the 3.73 swap out easy into 4.10 housing?
JB4XX is offline  
post #2 of 15 Old 06-11-2013, 03:15 PM
Compression Ignition Addict
 
Joel's Avatar
 
Join Date: Oct 2008
Location: Abbotsford
Posts: 2,709
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Thanks: 29
Thanked 125 Times in 113 Posts
Feedback Score: 0 reviews
The front is a direct swap.
I don't think the rears will though as the local guys gears are probably from a SRW truck and the dually uses a different rear end.

Buy bigger tires

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 #3 of 15 Old 06-11-2013, 03:32 PM
the baconator

 
terryknight's Avatar
 
Join Date: May 2009
Location: Easton MD 21601
Posts: 12,553
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 81 Post(s)
Thanks: 8
Thanked 118 Times in 113 Posts
Feedback Score: 2 reviews
your rear end is a Dana 80 the SRW trucks use a sterling 10.5 so the rear gears as stated above are not interchangeable

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



Quote:
Originally Posted by alberta 7.3 View Post
YouTube: Providing idiots everywhere a podium to share their stupidity
terryknight is offline  
post #4 of 15 Old 06-16-2013, 03:37 PM
Member
 
Join Date: Jan 2010
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 1 reviews
Unless you're doing this yourself, most of the cost is in labor. Don't cheap out with used gears. Also, if you're doing it for the fuel cost, youre going to have to drive a lot more than 4k miles to make up for the swap costs.

That being said, I'm swapping my 4.10's to 3.73's next time I have the rear apart. I just want the lower cruising rpm's mostly.

'03 7.3 Lariat. 320k and counting

8secondride is offline  
post #5 of 15 Old 06-16-2013, 05:59 PM
Compression Ignition Addict
 
Join Date: Jul 2011
Location: Middle TN
Posts: 1,014
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Thanks: 5
Thanked 13 Times in 12 Posts
Feedback Score: 3 reviews
If all you use it for is towing, then don't swap. Maybe a taller tire.

2000 F250 XcabSB, 4x4, 4" strait pipe, DIY intake, FRx, BDP tunes, WW2, 6.0 cooler, BTS VB, gauges, 55w digital projector HIDs
gomer pyle is offline  
post #6 of 15 Old 06-16-2013, 06:15 PM
Powerstroke.org Rookie
 
Join Date: Apr 2013
Location: The mitten
Posts: 19
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 1
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
If your pulling near maximum weight I would stick with the 4:10's sure its a ***** on the freeway but if you drive 60-65 it isnt bad. If your at max weight and going up any type of decent grade you will be thankful for any shorter gear you can get.

99.5 F350 DRW CC 4x2 53k on the clock 7.3 6637 intake mod. Hand made 4" exhaust. 4.10 gear.

92 Mustang lx 362ci N/A 830hp. Ultra street & X275 car
calypso50kid is offline  
post #7 of 15 Old 06-16-2013, 07:06 PM
Premium Member
 
Macon's Avatar
 
Join Date: Jun 2012
Posts: 3,804
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 3
Thanked 22 Times in 22 Posts
Feedback Score: 0 reviews
I wouldn't change them. Unless you're keeping stock tire size, 4.10 is what everyone else wants. 35's will drop RPM's, bringing it to ~stock engine speeds. Since it's a dually, narrow tires are required, so you mileage shouldn't be affect much by the height change. I would love to say it's better, but a stuck hub fudged my numbers.

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
Macon is offline  
post #8 of 15 Old 06-16-2013, 08:59 PM
Compression Ignition Addict
 
Joel's Avatar
 
Join Date: Oct 2008
Location: Abbotsford
Posts: 2,709
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Thanks: 29
Thanked 125 Times in 113 Posts
Feedback Score: 0 reviews
255/85-16 is a tire match made in heaven for a dually if you're still running stock rims

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 #9 of 15 Old 06-17-2013, 04:05 PM
Compression Ignition Addict
 
Join Date: Mar 2011
Posts: 983
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Thanks: 0
Thanked 7 Times in 6 Posts
Feedback Score: 0 reviews
....'cept 255's only seem to be available on a mud/offroad tread. Mine has 255's and I was going to stick with them but no one seems to have that size on a street/mild offroad tread anymore. Evidently they have been discontinued.
ttyR2 is offline  
post #10 of 15 Old 06-18-2013, 09:30 PM
Compression Ignition Addict
 
Joel's Avatar
 
Join Date: Oct 2008
Location: Abbotsford
Posts: 2,709
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Thanks: 29
Thanked 125 Times in 113 Posts
Feedback Score: 0 reviews
I know what you mean.
The only tire I know of that I would consider is the Toyo M55
I like that tire

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  
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