For Sale LSD differential and non-LSD differential - Alfa Romeo Bulletin Board & Forums
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post #1 of 33 (permalink) Old 11-06-2016, 06:13 PM Thread Starter
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LSD differential and non-LSD differential

Two for sale.
Both have a 41 tooth ring gear, I don't know the teeth on the pinion gear.
LSD $200
non-LSD $50

Would rather not ship. Located in SE NH. I work in northern MA (near Glynn), and can bring them there.


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post #2 of 33 (permalink) Old 11-07-2016, 11:21 AM
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Originally Posted by UngaWunga View Post
Two for sale.
Both have a 41 tooth ring gear, I don't know the teeth on the pinion gear.
LSD $200
non-LSD $50

Would rather not ship. Located in SE NH. I work in northern MA (near Glynn), and can bring them there.


Do you know from which year the LSD diff comes from, and approximate mileage on it?

How do you know that it has 41 tooth ring gear, but you aren't sure of the number of teeth on the pinion gear? Have you opened the diff sump, if so, any signs of "corrosion"?

I'm interested.....

I'm in the Lake George, NY area.
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post #3 of 33 (permalink) Old 11-07-2016, 03:42 PM Thread Starter
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They both came from GTVs, both 2L cars, I believe. I haven't removed the sump plate, and as I said above, I don't know the number of teeth on the pinion gear. I counted the teeth through the filler hole, and it all looks good from there. No corrosion internally.
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post #4 of 33 (permalink) Old 11-07-2016, 07:54 PM
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Thanks for the reply. Would you please take a few more pics of the LSD differential, focusing on the rotor ends, both left and right sides, as well as, full-width shots, both "right-side up" and "upside-down". Also, would you please measure if the input flange bolt size is 8 or 9 mm?

Please note any casting numbers on the diff case, which may help me determine if this will fit on my '91 Spider Veloce.

While it came from a GTV, as you say, but can you tell what model year that would be?
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post #5 of 33 (permalink) Old 11-08-2016, 08:18 AM
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Ratios

Any GTV would have a 4.56 R&P ratio.

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post #6 of 33 (permalink) Old 11-09-2016, 04:03 PM Thread Starter
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Most likely, which is why I don't want to open the bottom pan if I don't need to.
Since they're from 2L engines, they're the larger bolt holes on the input flange.
I don't see any numbers in the differential castings. You'll want to clean these up and most likely replace the seals in them at least before dropping them in any car.
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post #7 of 33 (permalink) Old 11-10-2016, 07:12 AM
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Diff

You cant see any of ring rear or pinion by removing the pan.

Ring gears are marked as in bottom 2 pics. This is 10/41.
You will have to clean by spraying brake clean to remove old grease in order to see it through the filler hole.

4.56 will be marked 9/41
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Last edited by Alfar7; 11-10-2016 at 06:41 PM.
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post #8 of 33 (permalink) Old 11-10-2016, 07:55 AM
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They may have a paint mark - I think painted on the front end of the pinion or the input flange? I have one with the red mark (4.56) sitting on my garage floor but I can't quite picture where the paint mark is sitting here at work. Red for 4.56, Green for 4.10. Might have been obliterated though.....

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post #9 of 33 (permalink) Old 11-10-2016, 06:42 PM
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Marks

No paint marks from the factory

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post #10 of 33 (permalink) Old 11-12-2016, 04:41 AM Thread Starter
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And what happens when a bearing completely fails?

In one instance at least, when traveling at highway speeds one of the axles snapped, the end of which then punched through the sheet metal of the wheel arch as the axle with attached wheel left the car. What remained of the lubricant in the rear end caught fire. It was a small, contained fire that was put out by the owner's son who sprayed it with diet soda. The son told this story at a Boy Scouts meeting, I met the father then bought the GTV that had been sitting at the side of his house for the better part of a decade with the missing wheel and punctured sheet metal. It too rusty for me to justify restoring it at the time, but it did yield many usable parts.

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post #11 of 33 (permalink) Old 11-13-2016, 04:35 AM Thread Starter
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Originally Posted by Alfar7 View Post
You cant see any of ring rear or pinion by removing the pan.

Ring gears are marked as in bottom 2 pics. This is 10/41.
You will have to clean by spraying brake clean to remove old grease in order to see it through the filler hole.

4.56 will be marked 9/41

I did look through the filler hole for stamped numbers, didn't see any. Could only see over so far.
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post #12 of 33 (permalink) Old 11-13-2016, 08:56 AM
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Quote:
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when traveling at highway speeds one of the axles snapped, the end of which then punched through the sheet metal of the wheel arch as the axle with attached wheel left the car.
Holy cow! For that to happen, the brake disk and caliper need to fracture or completely deform.

Quote:
What remained of the lubricant in the rear end caught fire. It was a small, contained fire that was put out by the owner's son who sprayed it with diet soda
Thank heaven it was diet soda! Don't want our burning differentials to gain weight.

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post #13 of 33 (permalink) Old 11-15-2016, 05:48 PM
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Most likely metal fatigue arising from damage during maintenance. These failures can occur a long time after the damage.

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post #14 of 33 (permalink) Old 11-15-2016, 07:20 PM
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How hard is it to rebuild the LSD back to or close to factory specs?
I don't think I would put it in a car without a rebuild.
.

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post #15 of 33 (permalink) Old 11-16-2016, 06:32 AM
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Checking ratios

From my earlier post on a different thread

It`s simple but you can`t always see the stamping depending on size of the pinion gear and the offset of the ring gear to fit on it.

Jack the car up and remove the left rear wheel (ring gear is to the left side of the pinion)
open the fill plug.
Dry off a visable tooth and paint a white mark on it.
without moving the drive shaft or ring gear paint a reference mark on the dust shield and below it on the diff housing.
Turn the driveshaft 4 turns stopping at the white reference mark and start to look for the tooth marked in white.
If the tooth shows up after moving the shaft about 1 inch (at the shield) it`s a 4.10. at 1/2 turn more it will be a 4.56, about an inch past 5 turns it`s a 5.10 .

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RJR Racing

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4.10, 4.56, differential, lsd

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