Anyone know?
Thread Starter
|
New User
Joined: Apr 2006
Posts: 8
Likes: 0
Anyone know?
Hi!.. Ok so I broke the rear end in my 70 1/2 ton pick up and have one from a 69 ford 1/2 ton im swapping it with. I pulled the tags off of them and this is what they read
The 69 WDM-W 9LA
3.50 9 301A
The 70 WDM-U OEA
3.70 8.7 302A
Can somone give me a detailed explanation of what every one of those letters and numbers stand for?. thanks a lot for reading..
The 69 WDM-W 9LA
3.50 9 301A
The 70 WDM-U OEA
3.70 8.7 302A
Can somone give me a detailed explanation of what every one of those letters and numbers stand for?. thanks a lot for reading..
Posting Guru
Joined: Sep 2007
Posts: 1,433
Likes: 7
From: Los Banos, California
tag ID
Howdy, on your 2 tags, the 69 first- top row WDM-W = a 9" differental, the 9LA is the date code 9 = year (1969) L = month, A = week, bottom row, 3.50 = 3.50.1 gear ratio, 9 = 9" ring gear diameter, 301A = plant code. this is a 4 pinion differental, (C4)
the 1970 tag, WDM-U = 8 3/4 differental, 0EA = date code 0(1970) E= month A = week, 3.70 = 3.70.1 gear ratio, 8.7 = ring gear diameter (8.3/4), 302 A = plant code. this is a 2 pinion differental (C2)
My opinion is that you will be better off with that 1969 9" 3.50-1 in your truck, its a good all around gear ratio. for auto or 4 sp trucks......
I hope this all helps. Jess
the 1970 tag, WDM-U = 8 3/4 differental, 0EA = date code 0(1970) E= month A = week, 3.70 = 3.70.1 gear ratio, 8.7 = ring gear diameter (8.3/4), 302 A = plant code. this is a 2 pinion differental (C2)
My opinion is that you will be better off with that 1969 9" 3.50-1 in your truck, its a good all around gear ratio. for auto or 4 sp trucks......
I hope this all helps. Jess
Thread Starter
|
New User
Joined: Apr 2006
Posts: 8
Likes: 0
Hey
Thanks a lot guys .. thats exactly what i wanted to know.. yeah it has a 4 spd..with a 390. it was a orig. a 300 with a 3 spd.. kinda sucks because it already screams on the freeway..but i dont go too far too often so.. this should be fine.. thanks again!
-josh
-josh
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Welcome to FTE
While the ring and pinions on some 9" rear ends measure 8 3/4", it's still considered a 9 inch rear axle.
Do not confuse this 8 3/4" rear axle with the 8.7 passenger car axle introduced in 1967. Two completely different rear ends. The WER 8.7 car axle is an integral setup, never used in F Series trucks, Econolines or Bronco's.
While the ring and pinions on some 9" rear ends measure 8 3/4", it's still considered a 9 inch rear axle.
Do not confuse this 8 3/4" rear axle with the 8.7 passenger car axle introduced in 1967. Two completely different rear ends. The WER 8.7 car axle is an integral setup, never used in F Series trucks, Econolines or Bronco's.
Last edited by NumberDummy; Oct 15, 2007 at 12:10 AM.
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
Originally Posted by EdelBrockin_7
...kinda sucks because it already screams on the freeway..but i dont go too far too often so.. this should be fine.. thanks again!
-josh
-josh
Thread
Thread Starter
Forum
Replies
Last Post
clydes 74 ford
1973 - 1979 F-100 & Larger F-Series Trucks
15
Nov 6, 2017 11:40 PM
Rocking M
Clutch, Transmission, Differential, Axle & Transfer Case
7
Jan 6, 2004 07:58 AM
