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Old 12-05-2019, 01:03 AM   #1
adamdrives
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Default identifying early 240 axle

I've looked around but most of what I've found applies to the later axles with the 1031/1041 sticker on them. My 78 has a sticker that says its a 3.91 with part number 1216079 and fabr (fabrication?) number 110241. It doesn't act like an open diff (can't spin just one wheel while holding the other on the lift) but I'm pretty sure I did a one wheel peel the other day. Does anyone have more info on identifying these early axles? I also have an 83 240 turbo with the same type of sticker that doesn't look like the later ones. Thanks
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Old 12-05-2019, 01:28 AM   #2
2manyturbos
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If it is in Park or in gear, you are not going to be able to spin one wheel while stopping the other. What happens when you turn one side and don’t restrain the other? Does it turn the opposite direction?
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Old 12-05-2019, 09:58 AM   #3
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Pull the cover off if you want to see if it's anything but an open diff, I would bet it probably is though. The 3.91 out of the 80 GT I crushed was an earlier 1030 open diff.
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Old 12-05-2019, 03:05 PM   #4
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^^

If it has the DANA clutch type posi in it there should be a special oil requirement tag on it. Very few cars from back then have the posi in them. It was a dealer added deal.
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Old 12-05-2019, 03:14 PM   #5
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Does the early one have cooling fins on the bottom?
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Quote:
Originally Posted by hiperfauto View Post
Folks on here don't know a good deal when they see it.
how psi stock cna support?

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Old 12-05-2019, 11:49 PM   #6
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Quote:
Originally Posted by 2manyturbos View Post
^^

If it has the DANA clutch type posi in it there should be a special oil requirement tag on it. Very few cars from back then have the posi in them. It was a dealer added deal.
Would the sticker be in any particular place? Haven't had my car at the shop this week to check.
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Old 12-06-2019, 01:04 AM   #7
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It's not a sticker. It's a metal tag that's held on by one of the rear cover bolts.

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Old 01-04-2020, 02:34 AM   #8
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Okay, it's not a locker :(
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Old 01-04-2020, 04:09 AM   #9
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It's never lupus.
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Old 01-04-2020, 04:48 PM   #10
2manyturbos
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Quote:
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Okay, it's not a locker :(
They never were lockers back in those models. There is a big difference between a locker and a clutch type, pre-loaded, limited slip differential in how the operate.
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Old 01-04-2020, 05:51 PM   #11
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Quite true, just making a general statement that it is a plain Jane open diff.
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Old 01-04-2020, 06:04 PM   #12
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That’s what makes them easy to detect though. If they are the clutch type limited slip, the tires will always turn in the same direction when you rotate one, unless the clutches are shot or the differential is broken. With a locker, they behave like an open differential until they lock. They are much harder to detect without taking the cover off.
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