1994 Gear Swap?
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1994 Gear Swap?
How do you find out your gear ratio of your axles. Im looking at a lower gear ratio and was wondering how do i do it. If I was to take it to a garage how much would it cost. Im planning on getting bigger tires and i know it would need lower gears. My truck is a 1994 F150 4x4 302.
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Joined: Dec 2002
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From: USA
The gear change for my F350 4x4 was $1500 for both axles using premium quality gears (Dana Spicer and Precision). Your F150 may be a little cheaper. I had a local shop that specializes in axles and drivelines do the install. I got their number from the manufacturer of the gears I wanted to put in my truck.
You can find your current axle ratio by looking on the VIN/weight sticker on the driver's door under 'axle'. There will be a code there, either 2 digits or a letter and a number. Code 19 = 3.55 open, H9 = 3.55 limited slip. I forget what the codes are for 3.08 and 3.31 ratios. Look in the 'tech articles' section of this website (link in the upper right corner of this page), under the 'axles' or 'decoders' section and you will find a chart showing all the ratio codes.
You can find your current axle ratio by looking on the VIN/weight sticker on the driver's door under 'axle'. There will be a code there, either 2 digits or a letter and a number. Code 19 = 3.55 open, H9 = 3.55 limited slip. I forget what the codes are for 3.08 and 3.31 ratios. Look in the 'tech articles' section of this website (link in the upper right corner of this page), under the 'axles' or 'decoders' section and you will find a chart showing all the ratio codes.
Laughing Gas
Joined: Oct 2004
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From: Brandon Mb
There should be a tag on the rear diff that says what is inside. If anyone has had the rear end open though there is a good chance that it is lost, but it's worth a look. They are probly 3.55's, I think that was the most common option, not sure if 3.73's or 4.10's were options on the 1/2 tons.
The rear end is easy to change, and the front isn't as complicated as you'd think, you just need some specialty tools. Get a Chilton or Haynes manual and you should be able to do it.
If you find used parts you shouldn't need to change axles or anything like that. I think the only axle available in the back is a 31 spline, but I could be wrong. Don't know about the front.
Hope this helps,
Trevor
The rear end is easy to change, and the front isn't as complicated as you'd think, you just need some specialty tools. Get a Chilton or Haynes manual and you should be able to do it.
If you find used parts you shouldn't need to change axles or anything like that. I think the only axle available in the back is a 31 spline, but I could be wrong. Don't know about the front.
Hope this helps,
Trevor
