Rearend question
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New User
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Rearend question
I'm getting a new cam and they wanted to know my axle ratio. I said I didn't know it right off hand but I could find out. So I went out and jacked up the rear, spun the tire 2 full rotations like the guy at the parts house said and came up with about 3.00. I said to myself I have never heard of a 3.00 rearend. So I called my dad and he said the same thing. So my question to you all Did the '73 F-100 have an avilable 3.00 rearend?
Postmaster
Joined: Nov 2004
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From: Nebraska
Okay one question why did they need your rear axle ratio i don't see the need it has nothing to do with the cam. The big 3 offered different axle ratio's some were standard but some you could order if you bought new.
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New User
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I don't know why they wanted rear axle ratio but I said OK. My dad boutght the truck used so he didn't know what axle ratio it had. We haven't messed with the axle ever in the 30+ years we have owned it. We might pull it all apart and do a complete overhaul on it. But it would be nice to know without tearing it apart.
Post Fiend
Joined: Mar 2005
Posts: 8,542
Likes: 5
From: Louisiana
They might of wanted to know the gear ratio, b/c if it is real low numatically, they might want to give him one with alot of power gains down low to help with acceleration.
Anyway, they had a couple different gear ratios around that area.
2.75
3.00
3.08
3.07
You can go check the bolt circle on the rear end, and if your lucky it will have a metal tag somewhere with some #s on it telling what gear ratio you have.
Or, you can check the door jab or vin #(but I don't remember which number/letter you need to look for).
Anyway, they had a couple different gear ratios around that area.
2.75
3.00
3.08
3.07
You can go check the bolt circle on the rear end, and if your lucky it will have a metal tag somewhere with some #s on it telling what gear ratio you have.
Or, you can check the door jab or vin #(but I don't remember which number/letter you need to look for).
New User
Joined: Oct 2004
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Do You know if all these gear ratios were 28 spline or 32? thanks
Originally Posted by MBBFord
They might of wanted to know the gear ratio, b/c if it is real low numatically, they might want to give him one with alot of power gains down low to help with acceleration.
Anyway, they had a couple different gear ratios around that area.
2.75
3.00
3.08
3.07
You can go check the bolt circle on the rear end, and if your lucky it will have a metal tag somewhere with some #s on it telling what gear ratio you have.
Or, you can check the door jab or vin #(but I don't remember which number/letter you need to look for).
Anyway, they had a couple different gear ratios around that area.
2.75
3.00
3.08
3.07
You can go check the bolt circle on the rear end, and if your lucky it will have a metal tag somewhere with some #s on it telling what gear ratio you have.
Or, you can check the door jab or vin #(but I don't remember which number/letter you need to look for).
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New User
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I'm not sure if it is the original axle. Why would someone want such a low ratio? I took it by the shop today and did the same thing I did. They said it was most likley a 3.00.
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Joined: Jul 2004
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Automatics had the 3.00 gears for hiway speeds and driveability. I have a AT & 3.00 gears with 31.5" tires and can cruise 76 mph @ 2500 rpm's. Not much of a towing vehicle however. I also have a '68 with NP435 4 speed and 4.10 gears. Not the most driveable on the freeway, but can tow a houses or a train, like in the old adds. It also helps having a fe 390.
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From: East Bend, Carolina, U.S
Originally Posted by Thomasm67
That's a 9 then you have to drop your ds then unbolt the bolts from the front then you can pull the 3rd member out from the front.