Gear ratio's??
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Fleet Mechanic
Joined: Oct 2003
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From: CentralEastern Utah
Gear ratio's??
I got a couple questions. Where on your truck do you look to find you front and rear axle ratio's? My truck will do about 70 mph at around 2400 rpms. Second, which is easiest when want ing to change ratio's? Whole front and back axle swap or a gear change. Also Is their any diiference between the axles on my 94 psd and say a mid to late 80's truck. (possible donor)????? Thanks for the info!
Logistics Pro
Joined: Jul 2001
Posts: 4,137
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From: Marble Falls, Texas
Far easier to do the gear change. I say that because your front axle should be a Dana 50 TTB. I have never really messed with setting one of those up. As far as the late 80's truck having the same equipment. I think your 94 has the speed sensor on the rear axle, the late 80's one won't. But yeah they are probably the same axles, just without the bells and whistles. I have a 96 F350 dually psd. I am taching about the same at 70 and I have 4:10 gears. Hope that helps.
RubberDuck
RubberDuck
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Joined: Feb 2002
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From: Bonney Lake, WA
From your rpm at 70mph, I'm pretty sure you've got a 4.10:1 ratio. There's an axle code on the sticker on the driver's door jamb. It will either be two numbers, for example 39, or one letter and one number, for example C5. Post that information, and we'll be able to tell you exactly what you've got, from a table that's in the owner's manual.
Incidentally, two numbers indicates an open rear end, a letter and a number indicates limited-slip.
If, for some reason, the sticker on your door jamb is missing, there's also a tag on the housing cover of the rear end. It will have some cryptic numbers/letters on it. If you post those, we'll also be able to decipher it for you.
Incidentally, two numbers indicates an open rear end, a letter and a number indicates limited-slip.
If, for some reason, the sticker on your door jamb is missing, there's also a tag on the housing cover of the rear end. It will have some cryptic numbers/letters on it. If you post those, we'll also be able to decipher it for you.
Senior User
Joined: Jan 2002
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From: waterford nj
You don't have to any deciphering at all if you just crawl under the truck, front or back and read the axle tag.
The metal tag is bolted to the differential cover and the first three numbers are the ratio.
There is typically a space between the first digit and the next two digits.
It will look like this:3 73 or 4 10.
The metal tag is bolted to the differential cover and the first three numbers are the ratio.
There is typically a space between the first digit and the next two digits.
It will look like this:3 73 or 4 10.
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