Identifying front axle
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Junior User
Joined: Jan 2001
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From: Puyallup, WA USA
Identifying front axle
I have a 1975 Ford F100 4x4 with the following front axle code: 4 09 D4TA-ZA 603472-5. I do not know how to read them. I have broken gears in the pumpkin and need to look for a replacement. Any help greatly appreciated. Thanks
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Junior User
Joined: Jan 2001
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From: Puyallup, WA USA
I appreciate the reply. Which numbers tells you it is a Dana 44? According to my vin# I have 4.11 in the rear end. The vin # is F11YRX41717. I always thought that the rear end and front end would be the same??? Thanks
Cargo Master
Joined: Jan 2004
Posts: 2,512
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From: Cook Forest and Irwin PA
Originally posted by manlikesford
I appreciate the reply. Which numbers tells you it is a Dana 44? According to my vin# I have 4.11 in the rear end. The vin # is F11YRX41717. I always thought that the rear end and front end would be the same??? Thanks
I appreciate the reply. Which numbers tells you it is a Dana 44? According to my vin# I have 4.11 in the rear end. The vin # is F11YRX41717. I always thought that the rear end and front end would be the same??? Thanks
Id beleive 409...that was a popular axle ratio in old jeep pickups of the same era (71-76) using 360 amc motors and they used 44's front and rear.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
The first three digits are the axle ratio. You definately have a 4.09 axle. It doesn't have to match the rear exactly. I believe it has to be within 1%. Also, manufacturers had gear ratios that they liked to use. Dana made a 4.09, and Ford (well, sterling) makes 4.11 axles.
D4 means it's a 1974 part. It has nothing to do with what kind of axle it is. You are correct that it's a Dana 44, though, because that's what went under the front of an F100 in 1975.
D4 means it's a 1974 part. It has nothing to do with what kind of axle it is. You are correct that it's a Dana 44, though, because that's what went under the front of an F100 in 1975.
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Junior User
Joined: Jan 2001
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From: Puyallup, WA USA
I appreciate all the information. My next question is it more cost effective to replace the whole front end or replace the pinion and gear? I took my cover off and the pinion gear teeth are gone. Explains why it would not go into 4 wheel drive. I have done engine rebuilds before but nothing dealing with differentials. Thanks
Cargo Master
Joined: Jan 2004
Posts: 2,512
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From: Cook Forest and Irwin PA
Originally posted by manlikesford
I appreciate all the information. My next question is it more cost effective to replace the whole front end or replace the pinion and gear? I took my cover off and the pinion gear teeth are gone. Explains why it would not go into 4 wheel drive. I have done engine rebuilds before but nothing dealing with differentials. Thanks
I appreciate all the information. My next question is it more cost effective to replace the whole front end or replace the pinion and gear? I took my cover off and the pinion gear teeth are gone. Explains why it would not go into 4 wheel drive. I have done engine rebuilds before but nothing dealing with differentials. Thanks
the difference between ford and dana axles mean that the gear ratios are close - but close enuf. 4x4s always wind up on dry pavement, even if the gears were exact, first time you turned the front wheel it would wind up because of the different track radius'.
my f150 has a 3.55 rear and a 3.54 front - the larger (numerically) the axles are, the less sensitive the difference is (difference expressed as a percentage of total ratio.
as for fixing it, if you can find a boneyard unit in the correct ratio, you might get a deal ($200-250 is what I usually pay) compared to a whole new gearset ($250ish range) plus a lot of setup labor (shim kits too)
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Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
The other option is to have a shop rebuild your axle for you. It will probably cost twice what a boneyard axle would cost (figure on $500 or so) but you know you're getting a fresh axle that will not give you any problems and doesn't have any wear. Unless you know what signs of wear to look for when axle shopping, this might be the way to go.
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