How to tell what gears I have? - Ford Powerstroke Diesel Forum
Suspension & Steering Discuss OEM & aftermarket suspension, lifts, air ride suspension, shocks, steering components, etc.

User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 04-27-2010, 11:53 AM Thread Starter
Member
 
gonesurfing's Avatar
 
Join Date: Dec 2009
Location: surfing, spearfishing, using my powerstroke to tow boats to the river!
Posts: 52
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
How to tell what gears I have?

Hey guys, I bought my truck used and it already had a 6" lift on 37s. I'm curious what gears I have on my truck and want to know if the prior owner switched them from stock. I haven't gotten a programmer yet so my speedo hasn't been calibrated for the larger tires. When my speedo says 55mph I'm down around 1550-1600rpms. And when my speedo says 55mpg I'm actually going about 60mpg calculated by gps. Anyone have an idea of what I've got? Also, if I pull the rear cover off how do I go about calculating my gearing? Thanks!!!

'05 f350 FX4 CCLB
6" pro comp lift w/Fox shocks
37"x13.50"x20" pro comp Xterrains
4" MBRP turbo-back w/cat delete
Airaid cold air intake
Bulletproof diesel egr cooler and oil cooler
gonesurfing is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 04-27-2010, 01:37 PM
Compression Ignition Addict
 
MDarrough's Avatar
 
Join Date: Aug 2008
Location: Texas Hill Country
Posts: 833
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 5 Times in 5 Posts
Feedback Score: 0 reviews
I would wager that you have 3.73 gears, but there should be a small metal tag on the rear diff under one of the diff cover bolts.

Mark

2011 F-350 4X4 Dually Lariat pulling a 2010 Sierra 355QBQ 5er -- Pic of Both



--- Sold - '01 F350, 8" lift, 38s --- Sold - '08 F-350 Leveled on 35s
MDarrough is offline  
post #3 of 7 Old 04-27-2010, 01:40 PM Thread Starter
Member
 
gonesurfing's Avatar
 
Join Date: Dec 2009
Location: surfing, spearfishing, using my powerstroke to tow boats to the river!
Posts: 52
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I swapped my cover out and have an '08 cover now. I still had my stock 3.73 tag on there when I switched out the covers but I know thats not a sure bet they are still stock.

'05 f350 FX4 CCLB
6" pro comp lift w/Fox shocks
37"x13.50"x20" pro comp Xterrains
4" MBRP turbo-back w/cat delete
Airaid cold air intake
Bulletproof diesel egr cooler and oil cooler
gonesurfing is offline  
post #4 of 7 Old 04-27-2010, 04:55 PM
Compression Ignition Addict
 
Michael707's Avatar
 
Join Date: Jun 2007
Location: crescent city
Posts: 198
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
isnt it something like every turn of the axle how ever many turns the diff did thats the gear ratio or something? idk it was just a guess
Michael707 is offline  
post #5 of 7 Old 04-27-2010, 06:57 PM
Super Moderator


 
PGreenSVT's Avatar
 
Join Date: Mar 2008
Location: Abingdon, Md.
Posts: 11,991
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 4
Thanked 44 Times in 18 Posts
Feedback Score: 3 reviews
Yes, jack it up, put it in neutral, have someone turn a wheel 1 revolution and count the revolutions the driveshaft makes. If it goes around about 3 3/4 times they are 3.73's. If it goes around a little more than 4 times it's a 4.10, 4 1/2 times 4.56, etc.
PGreenSVT is offline  
post #6 of 7 Old 04-28-2010, 09:57 AM
Compression Ignition Addict
 
Michael707's Avatar
 
Join Date: Jun 2007
Location: crescent city
Posts: 198
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
cool man i was right for once

96 7.3 PSD
240,000 miles
diesel innovations chip
11 inch lift that eats my 38s
basically a rolling cloud
Michael707 is offline  
post #7 of 7 Old 04-28-2010, 09:59 AM Thread Starter
Member
 
gonesurfing's Avatar
 
Join Date: Dec 2009
Location: surfing, spearfishing, using my powerstroke to tow boats to the river!
Posts: 52
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
sweet! Thanks

'05 f350 FX4 CCLB
6" pro comp lift w/Fox shocks
37"x13.50"x20" pro comp Xterrains
4" MBRP turbo-back w/cat delete
Airaid cold air intake
Bulletproof diesel egr cooler and oil cooler
gonesurfing is offline  
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:
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