I need schooled on differentials

[alabamafrog]

I’m trying to do a crash course in rear differentials. My ring gear apparently hasn’t 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?

[HOUTX01X]

Originally Posted by alabamafrog

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.

[panheadjay]

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.

[alabamafrog]

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.

[bigcountrysg]

I would have gone with new 3.73 gear and detroit tru trac.

[alberta 7.3]

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

[dbkerley]

Quit running so much sugar in your tank and that will cut down on the tooth decay.

[alabamafrog]

Originally Posted by bigcountrysg

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 that’s 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 don’t have the funds or the time right now.