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  #1  
Old 07-19-2009, 02:05 PM
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I need schooled on differentials

Iím trying to do a crash course in rear differentials. My ring gear apparently hasnít been brushing and flossing and has lost a few teeth now I need to quickly learn all there is to know about rear-ends and differential mods.

The tag on mine says S-406 B 3.73 10.5 8B24
What do these numbers mean? I understand the 3.73 and the 10.5 but got no idea about the rest.
What modifications or upgrades are recommended with price being very important?
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Old 07-19-2009, 03:25 PM
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Quote:
Originally Posted by alabamafrog View Post

The tag on mine says S-406 B 3.73 10.5 8B24
What do these numbers mean? I understand the 3.73 and the 10.5 but got no idea about the rest.
S-406B... Is for, Ford F250SD, F350SD Pickup ‘99

Little searchin on google.com


http://www.fordification.com/rearends-ford13.htm

Randy's Ring & Pinion. FAQ.
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Old 07-20-2009, 06:45 PM
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pinion depth setting tools come with ring and pinion info, very helpful. i paid 125.$ for mine , well worth it even if u use it once. can't remember the brand now but if your interested i'll go to the tool box and look. i've set a few diff's up before be glad to help if u need.
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Old 07-20-2009, 07:21 PM
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I chickened out and took the cheap way out and bought a junkyard rear-end today. $500 for the complete unit and its limited slip so no more one-legger.
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Old 07-20-2009, 07:35 PM
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Send a message via Yahoo to bigcountrysg
I would have gone with new 3.73 gear and detroit tru trac.
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Old 07-21-2009, 09:03 AM
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Interesting, I lost a piece of one of the ring gear teeth last month. 3.73's as well. Looked like it was a bad lump of steel to start with. Center of the tooth was black like slag. Decay
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Old 07-21-2009, 09:23 AM
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Quit running so much sugar in your tank and that will cut down on the tooth decay.
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Old 07-21-2009, 02:14 PM
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Quote:
Originally Posted by bigcountrysg View Post
I would have gone with new 3.73 gear and detroit tru trac.
Yea, new gears were $255, install kit was $290, trutrac was $600ish so total cost just for parts would have been around $1,200 and thatís if nothing went wrong and I got it all together right the first time. I agree I would have liked to do that but I donít have the funds or the time right now.
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