Identifying axles and gear ratios on a 1974 f250!! - Ford Truck Enthusiasts Forums



1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

Identifying axles and gear ratios on a 1974 f250!!

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 02-27-2002, 10:20 PM
my74f250 my74f250 is offline
New User
Thread Starter
 
Join Date: Feb 2002
Posts: 2
my74f250 is starting off with a positive reputation.
Identifying axles and gear ratios on a 1974 f250!!

How do I go about identifying what I have!! I would also like to know how to identify the trans and the transfer case! I think I have a pretty good Idea of what I have but would like to make sure!! Thanks
Reply With Quote
  #2  
Old 02-27-2002, 11:17 PM
bigbrownie bigbrownie is offline
Freshman User
 
Join Date: Feb 2002
Location: Sullivan
Posts: 25
bigbrownie is starting off with a positive reputation.
Identifying axles and gear ratios on a 1974 f250!!


The rear and front end are probably danas, and they sould have tags on the side of the pumpkin cover,it will say D4.11 or something like that. Thats your ratio and if Im not mistaken it also says D4.1160 which would be 4.11 ratio dana 60's. As far as transfer case and Transmission I dont know too much about. I know theres a different shape to the pan on the c-6. Maybe someone else can help you with that. Sorry I couldnt.
Reply With Quote
  #3  
Old 03-02-2002, 01:34 AM
jsworkman jsworkman is offline
Senior User
 
Join Date: Mar 2002
Location: Sandy USA
Posts: 144
jsworkman is starting off with a positive reputation.
Identifying axles and gear ratios on a 1974 f250!!

On the right side axle tube there should be a number stamped in the tube this is the bill of materials number a ford dealer should be able to tell you how your axles came loaded from the factory or post them here and I can check them in my Dana Spicer axle book.

P.S. check both tubes

Reply With Quote
  #4  
Old 03-02-2002, 09:11 AM
Art Art is offline
Senior User
 
Join Date: Jul 1999
Location: USA
Posts: 472
Art is starting off with a positive reputation.
Identifying axles and gear ratios on a 1974 f250!!

If the axles weren't changed, you can use the axle code on the door tag to identify the axle ratio and a whole lot more. If no tag, rotate both tires one revolution (same direction) and count the number of driveshaft revolutions. If you can turn only one tire, rotate it two revolutions while counting driveshaft revolutions.

From what I've seen, the front axle is most likely a 4.09Dana44 and the rear axle a 4.10Dana60. Axle code for 4.09/4.10 is A4 ("locking" rear diff) or 24 (open diff). I think that was the standard ratio from about 67~77, with steeper gears (such as 4.56) being optional.

The transfer case is a NP205 if the truck originally had lockouts on the front axle. The transfer case shifter **** reads 4L N 2H 4H with a NP205. If the truck did not have lockouts originally, it has the NP203 transfer case.

The transmission is most likely a NP435 if the truck has a 4speed, or a C-6 if the truck has an auto trans.

I'll bet you the engine is/was a 360 ("Y" letter for 4th character on VIN).

Art
Reply With Quote
  #5  
Old 03-03-2002, 07:23 PM
Mil1ion Mil1ion is offline
New User
 
Join Date: Jan 2008
Posts: 0
Mil1ion is starting off with a positive reputation.
Identifying axles and gear ratios on a 1974 f250!!

I'm perplexed, Why would you have to turn the wheels two turns if it isn't a limited slip diff ?

ONE revolution should give the ratio regardless of it being Locking or non-locking.

Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg



Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's"


78 F-150 429CJ,Silver, Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon
Reply With Quote
  #6  
Old 03-06-2002, 07:55 PM
Art Art is offline
Senior User
 
Join Date: Jul 1999
Location: USA
Posts: 472
Art is starting off with a positive reputation.
Identifying axles and gear ratios on a 1974 f250!!

>If no tag, rotate both tires one revolution (same
>direction) and count the number of driveshaft revolutions.



>If you can turn only one tire, rotate it two revolutions
>while counting driveshaft revolutions.



Art
Reply With Quote
  #7  
Old 03-06-2002, 08:33 PM
gr8199 gr8199 is offline
Junior User
 
Join Date: Nov 2001
Location: Simi Valley USA
Posts: 93
gr8199 is starting off with a positive reputation.
Identifying axles and gear ratios on a 1974 f250!!

Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Identifying carburetor '73 f250 w/ 460 73richards250 1973 - 1979 F-100 & Larger F-Series Trucks 16 10-13-2016 01:28 PM
How to identify engine Try this Ford New Member Introductions 1 02-12-2016 04:16 PM
Identify Transmission walksLikeBear Ranger & B-Series 3 08-17-2015 01:31 PM
how to identify posi rear end? 68fordf100v8 1987 - 1996 F150 & Larger F-Series Trucks 9 08-14-2012 10:51 AM
exhaust manifold replacement 69f250mg 1967 - 1972 F-100 & Larger F-Series Trucks 18 03-02-2001 08:46 PM


Go Back   Ford Truck Enthusiasts Forums >

Tags
1974, axle, axles, f250, ford, gear, ratio, rears

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 01:34 PM.