Go Back   F150online Forums > Powertrain & Mechanical > Transmissions
Sign in using an external account
Register Forgot Password?

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 12-23-2005, 09:38 PM
Member
 
Join Date: Nov 2005
Vehicle: 2004 F150
Posts: 75
Gear ratios...?

What are the actual ratios for each of the 6 gears on a '04 5.4L 3:55 r/e?
Reply With Quote
  #2  
Old 12-24-2005, 09:13 AM
Senior Member
 
Join Date: Apr 2002
Location: Mississippi
Vehicle: 2000 Ford F-150
Posts: 167
You only have 4 gears.

1st. 2.84
2nd I don't remember
3rd 1
4th .7
Reply With Quote
  #3  
Old 12-24-2005, 01:21 PM
Senior Member
 
Join Date: Dec 2004
Location: Dover AFB DE / Harrisburg PA
Vehicle: 11 FULLsize ole' Ford rigs
Posts: 4,931
Send a message via AIM to adrianspeeder Send a message via MSN to adrianspeeder Send a message via Yahoo to adrianspeeder
You have four forwards and a reverse so thats five gears. Haven't been following the new trucks too close to see what comes with what, but either tranny have the same ratios. Info from this post...

http://www.f150online.com/forums/sho...60#post1832360

Model: 4R70w
Type: Four speed + reverse and 70(x10)lbs of torque
Years: 94-96 Bronco, F150
..........97-02 Expedition, F150
..........04-06 F150
Engines: 300, 302, 4.2L, 4.6L, 5.4L
Display: PRN(D)21 w/ overdrive lockout switch
Fluid: Mercon V
Ratios:
1st 2.84:1
2nd 1.55:1
3rd 1.00:1
4th 0.70:1
Reverse 2.32:1
Trans code: U ('94-'03), A ('04-'06)

Model: 4R75E
Type: Four speed + reverse and 75(x10)lbs of torque
Years: 04-06 F150/ Mark LT
Engines: 5.4L
Display: PRN(D)21 w/ overdrive lockout switch
Fluid: ?
Ratios:
1st 2.84:1
2nd 1.55:1
3rd 1.00:1
4th 0.70:1
Reverse 2.32:1
Trans code: B ('04-'05), Q ('06), F ('06 Mark LT)

Adrianspeeder
__________________
Reply With Quote
  #4  
Old 12-25-2005, 09:09 AM
Member
 
Join Date: Nov 2005
Vehicle: 2004 F150
Posts: 75
Thanks for the transmision info. Now, I have a novice question about rear-axle gear ratios. I understand that the trans gear ratio is the ratio of engine RPM to drive shaft rpm. In a rear axle, what is the meaning of 3:55 (my FX)? I noticed there are many axle options, 3:75, 4:10, etc. :santa:
Reply With Quote
  #5  
Old 12-25-2005, 09:20 AM
Senior Member
 
Join Date: Oct 2003
Location: Arizona
Vehicle: 2002 Ford F150
Posts: 549
It's the ratio of the driveshaft RPM to the axle RPM. 3.55:1 means the driveshaft will rotate 3.55 times for every rotation of the axle.
Reply With Quote
  #6  
Old 12-25-2005, 10:27 AM
Senior Member
 
Join Date: Dec 2004
Location: Dover AFB DE / Harrisburg PA
Vehicle: 11 FULLsize ole' Ford rigs
Posts: 4,931
Send a message via AIM to adrianspeeder Send a message via MSN to adrianspeeder Send a message via Yahoo to adrianspeeder
Yup what he said.

A lower number is a "taller" gear giving better highway milage, and a higher number is a "deeper" gear giving more off the line grunt.

Adrianspeeder
Reply With Quote
Old 12-25-2005, 10:27 AM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are On
Refbacks are Off


All times are GMT -4. The time now is 07:49 PM.





This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
 
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details