2barrel or 4barrel?
Elder User
Joined: Oct 2008
Posts: 708
Likes: 1
It's the axle code in the door jam. Usually a single letter, sometimes two. For example: Axle code M could be a ford 8.8 with 3.55. Axle code NB could be a ford 10.25 with 4.10 and a posi.
I'm pulling those letters and numbers out of the air, but that's the general idea. You need a factory service manual to look the codes up. I have the 1984 and 1991 factory service manuals. They are good for a few surrounding years. If your truck is around those years I'll try looking them up for you.
I'm pulling those letters and numbers out of the air, but that's the general idea. You need a factory service manual to look the codes up. I have the 1984 and 1991 factory service manuals. They are good for a few surrounding years. If your truck is around those years I'll try looking them up for you.
Posting Guru
Joined: Sep 2004
Posts: 1,915
Likes: 1
From: Yokosuka, Honshu, Japan
Unless the axle has been worked on and the person didn't lose the tag, there should be a tag held by one of the differential cover bolts. It will have the gear ratio on it:
3 73 - 3.73 gears
3L73 - same, with a limited slip carrier
Or something similar to that.
3 73 - 3.73 gears
3L73 - same, with a limited slip carrier
Or something similar to that.
Posting Guru
Joined: Sep 2004
Posts: 1,915
Likes: 1
From: Yokosuka, Honshu, Japan
Your truck is a pre-1975? Can't remember if it was '75 or when they first started installing cats at the factory. If cats were part of the original equipment, then it's NOT exempt according to Federal emissions law, period.
Posting Guru
Joined: Sep 2004
Posts: 1,915
Likes: 1
From: Yokosuka, Honshu, Japan
I beg to differ. Texas follows Federal standards for their inspections. Some stations 'look the other way', but the way their inspection guidelines read, if it came from the factory with it for emissions control, it must be in place and working. Do you need the references? 
Moderator
Joined: Dec 2007
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From: Boise, Idaho
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
I checked out your gallery. That's one mean looking '77 dully. How does that 300 handle in such a large rig? What are you geared?
Thread Starter
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Senior User
Joined: Nov 2007
Posts: 215
Likes: 0
OK, I got my tag off of my rear axle, after wire brushing off some of the rust, hahaha . I have a number.. it's " 2 72 D7 A AF
603869 7 "
Does this make any sence to you guys? I have a 77 f150 custom 2wd with a 300inline,c4 AT. Would that tell me if I have a dana 60? what gears Im running? I have nooooo clue
603869 7 "
Does this make any sence to you guys? I have a 77 f150 custom 2wd with a 300inline,c4 AT. Would that tell me if I have a dana 60? what gears Im running? I have nooooo clue
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
From the axle tag you gave us it looks like you have a 2.72 gear ratio. These gears are designed for highway mileage and pair up best with tranny's with no over drive.
You can go over 100 MPH with that high of a gear ratio!
You can go over 100 MPH with that high of a gear ratio!
Senior User
Joined: Mar 2009
Posts: 370
Likes: 0
From: Diboll, Tx.
I beg to differ. Texas follows Federal standards for their inspections. Some stations 'look the other way', but the way their inspection guidelines read, if it came from the factory with it for emissions control, it must be in place and working. Do you need the references?
Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
Sure I live in ND. The emissions laws consist of "You need to install an exhaust I cant see through", "Glass packs arent street legal on a fuel injected vehicle; youve one week", and "Dont rev it up in town".
It may be siberia, but its got its pros. Cheep gas, no emissions laws, and miles and miles of empty two lane blacktop.
It may be siberia, but its got its pros. Cheep gas, no emissions laws, and miles and miles of empty two lane blacktop.
