name that axel
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Junior User
Joined: Jul 2003
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name that axel
On my newly acquired '99 F250 SD 4x4 the data sticker code for AXEL is C2.
The tag on the rear axel reads: S 157 C
4L10 10 5 8M03
The tag on the front axel reads: 4 10 VF81A DJ
810659 2
I'm not the expert obviously, but it looks like a 4.10 gear axel. Given that the truck has a 5.4L motor what would be the impact of changing to a 3.73 gear? I'm getting about 15 mpg on the hwy. now. Would it drastically change the towing? Thanks, and God Bless, huckster
The tag on the rear axel reads: S 157 C
4L10 10 5 8M03
The tag on the front axel reads: 4 10 VF81A DJ
810659 2
I'm not the expert obviously, but it looks like a 4.10 gear axel. Given that the truck has a 5.4L motor what would be the impact of changing to a 3.73 gear? I'm getting about 15 mpg on the hwy. now. Would it drastically change the towing? Thanks, and God Bless, huckster
Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
name that axel
Sterling 10.5" rear 4.10 ratio Limited Slip
Dana 50 Front 4.10 ratio
My opinion - Go to larger diameter tires if you could. The ratio difference of a 4.10 and 3.73 is not that much. For example, at 60 mph in OD with 3.73 is about 1690 RPM's vs 1857 RPM's with the 4.10 using 31 1/2"<> diameter tires.
Dana 50 Front 4.10 ratio
My opinion - Go to larger diameter tires if you could. The ratio difference of a 4.10 and 3.73 is not that much. For example, at 60 mph in OD with 3.73 is about 1690 RPM's vs 1857 RPM's with the 4.10 using 31 1/2"<> diameter tires.
Junior User
Joined: Sep 2002
Posts: 97
Likes: 1
From: Ruston, LA
name that axel
4L10 10 5 8M03
You are right about the 4.10 ratio. Also, the L means you have the limited slip in the rear axle. The 10 5 stands for the Sterling 10.5", which surprises me because I thought the 3/4 tons with the gas pusher would come with the Sterling 10.25".
You likely have a Dana 50 front axle with an open diff, but I'll let someone else verify that.
As for changing gears to 3.73 s, that will not be cheap as you must change both front and rear (gears & install kits alone cost about $6-700 plus installation). You may gain about 3 mpg, but the truck will search for the right gear more often and may not like hills as much under load. If you had the diesel, it wouldn't be as big a deal power wise.
You are right about the 4.10 ratio. Also, the L means you have the limited slip in the rear axle. The 10 5 stands for the Sterling 10.5", which surprises me because I thought the 3/4 tons with the gas pusher would come with the Sterling 10.25".
You likely have a Dana 50 front axle with an open diff, but I'll let someone else verify that.
As for changing gears to 3.73 s, that will not be cheap as you must change both front and rear (gears & install kits alone cost about $6-700 plus installation). You may gain about 3 mpg, but the truck will search for the right gear more often and may not like hills as much under load. If you had the diesel, it wouldn't be as big a deal power wise.
Posting Guru
Joined: Feb 2003
Posts: 2,153
Likes: 1
From: Roseburg OR.
name that axel
You are right about the 4.10 ratio. Also, the L means you have the limited slip in the rear axle. The 10 5 stands for the Sterling 10.5", which surprises me because I thought the 3/4 tons with the gas pusher would come with the Sterling 10.25".
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