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Old 07-24-2012, 07:39 PM
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differential identification

Looking to identify a differential with tag number S613C and a chart that will give widths of various Ford Differentials.

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Old 07-25-2012, 05:57 AM
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How about a picture or two?
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Old 07-25-2012, 08:29 AM
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I don't have the capability to send pictures. It is an 8.8 Ford from a 1998 Explorer with tag code S613C also has 3L73 an R and a 7K15 on the tag. An other tag on the differential says 75W 140W Synthetic oil only (nothing about using additives).
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Old 07-25-2012, 08:31 AM
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I'm assuming that you already know it's a 3.73 gear with the Trac Lock differential. I don't know what the other code it. What exactly is it that you want to know about this rear end?
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Old 07-25-2012, 08:50 AM
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I was assuming that it was a 3.73 but wasn't sure that it was traction loc since the other tag didn't list limited slip additives as earlier ford tags had. Thank you for confirming.
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Old 07-25-2012, 09:52 AM
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The L between the 3 and 73 says it's a Trac Lock.
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Old 07-25-2012, 07:37 PM
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I would pull cover and ID so you know for sure. The tooth count should be marked on the edge of the ring gear. You will see the clutch's if it's a Trac/Lok.

You never know if someone has done changes to the diff over the years and you could probably use fresh oil anyway. Use some additive if it's the Trac/Lok.
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Old 07-25-2012, 07:42 PM
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Not to hijack the OP's thread.. Hey BGH.. Have you used any of the WaveTrac's yet? I've been doing quite a few and seem to be a killer piece. I wanna take one apart so I can check out the inside.. But with a Limited Lifetime Warranty I figure I better leave it alone..
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Old 07-26-2012, 06:06 AM
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I've sold a few, but I haven't had my hands on one. It's hard to sell a differential for $800+ these days.
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Old 07-26-2012, 06:10 PM
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Originally Posted by big gear head View Post
I've sold a few, but I haven't had my hands on one. It's hard to sell a differential for $800+ these days.
That's a true story.. I've been pretty Lucky and Thankful this race season and done quite a few of them.. They are one trick piece. I would love to get one apart and see whats up.
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Old 07-26-2012, 08:02 PM
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Fordification has a pretty good list of axle tag id's.

The Ranger Station has the Explorer width measurements you're looking for.

Interesting to note that they suggest welding the axle tubes to the center section.
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Old 07-26-2012, 08:46 PM
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Originally Posted by prostreet6t9 View Post
That's a true story.. I've been pretty Lucky and Thankful this race season and done quite a few of them.. They are one trick piece. I would love to get one apart and see whats up.
For what it's worth, I found this YouTube video of how they work.
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Old 07-26-2012, 11:07 PM
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Interesting to note that they suggest welding the axle tubes to the center section.
Pretty common practice in HP applications.
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Old 07-26-2012, 11:17 PM
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[QUOTE=S10 Racer;1577446]For what it's worth, I found this YouTube video of how they work.

I've seen that interesting video.. Since they have such a good warranty,I'd just like to have one apart to see the inside.
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Old 07-27-2012, 06:16 AM
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Originally Posted by 66GMC View Post
Fordification has a pretty good list of axle tag id's.

The Ranger Station has the Explorer width measurements you're looking for.

Interesting to note that they suggest welding the axle tubes to the center section.
Welding the axle tubes is a good idea as long as it is done right. The center casting is cast iron and the axle tubes are steel. The only way that I know of to weld these two materials together is with nickel. I know of many people who have used a MIG welder with steel wire to stick them together, but this will break if it is stressed. It will look fine, but the weld will break off of the cast iron when stressed. Welding cast iron is not an easy job. I've been a certified welder for over 25 years and it's not an easy job for me. How to weld axle tubes on GM 8.5" 10-bolt - NastyZ28.com
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