4.30 Rear Axle - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 47 (permalink) Old 06-17-2010, 07:14 AM
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4.3 sets are hard to find.

Alfaholics has some newly made for the 1600 diff.

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Avatar is the 68 Super, bought new.
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post #32 of 47 (permalink) Old 06-27-2010, 10:55 AM
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My nephew parted a couple of rusty 80's era spiders last summer. I bought one of the diffs from him. Mostly, I bought it for extra LSD discs. Upon taking it apart this morning, I was very surprised to find 10 teeth on the pinion and 43 on the ring gear! Everything else about the diff is normal. From reading this thread, I can only assume the car was special ordered with the 4.30? Or perhaps a previous owner found a Euro Berlina diff to put in it.

I put a 4.10 in my street GTV (currently in pieces), but I like the idea of the 4.30 even beter!

Erik
'66 GTV racecar, '71 Spider racecar, '74 GTV street car, '71 GTV project
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post #33 of 47 (permalink) Old 07-19-2010, 03:45 PM
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Side tracking a little, after reading all the above am I correct in assuming that all 105 2ltr GTV's rolled off the production line with LSD's?... Someone mentioned above that they are heavy?... Is this as in normal 'heavier' being that it is an LSD or rediculously heavy?... Next question; is the O.e. LSD a good piece of equipment and is it viably servicable today considering that aftermarket LSD's are available. Does someone know when did the spiders started getting LSD's as standard fitment? Finally is there any way of telling the diff ratio and type (i.e. LSD or std) by and external inspection?.. I can get hold of a 2ltr GTV diff but I've been wanting to get answers to these questions before buying. Thanks.

Last edited by patanga; 07-19-2010 at 03:49 PM.
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post #34 of 47 (permalink) Old 07-19-2010, 04:48 PM
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I'm not sure about the rest of the world, but in the U.S., all of the 2L cars came with LSD's. I have always raced with the factory unit (with 2 friction discs added) and had good luck. I'm sure the aftermarket LSD's are better, but they are a lot more money too!

You can tell the LSD equipped diffs by a triangular-shape in the stiffening web on the bottom. There are pictures somewhere on the BB. The ratio can only be determined by turning the input and counting wheel revolutions.

Erik
'66 GTV racecar, '71 Spider racecar, '74 GTV street car, '71 GTV project
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post #35 of 47 (permalink) Old 09-04-2010, 12:01 AM
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Originally Posted by patanga View Post
Side tracking a little, after reading all the above am I correct in assuming that all 105 2ltr GTV's rolled off the production line with LSD's?... Someone mentioned above that they are heavy?... Is this as in normal 'heavier' being that it is an LSD or rediculously heavy?... Next question; is the O.e. LSD a good piece of equipment and is it viably servicable today considering that aftermarket LSD's are available. Does someone know when did the spiders started getting LSD's as standard fitment? Finally is there any way of telling the diff ratio and type (i.e. LSD or std) by and external inspection?.. I can get hold of a 2ltr GTV diff but I've been wanting to get answers to these questions before buying. Thanks.
Hi Patanga.

I don't think all 2.0's came with LSD just the berlina,I could be wrong.

If you can lift the back wheels and turn one rear wheel the other wheel should turn in the same direction. If it turns the opposing way it means you have a non LSD.

I'll be getting the alfaholics LSD unit. One of the garages here has fitted them and said they are great, lighter as well. Any of the weight you can take out of that rear axle assembly will help things from what I've heard.

Cheers
Andy

Cheers

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post #36 of 47 (permalink) Old 09-04-2010, 12:14 AM
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...turn one rear wheel the other wheel should turn in the same direction.
While true for virtually every other vehicle on the planet, the Alfa LSD does not do this; turning one wheel in one direction will have the other wheel turning in the opposite direction, just like a non-LSD (open) rear.

To determine if it's an LSD, look for the 'V' in the casting and 3 extended cooling fins on the sump.
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post #37 of 47 (permalink) Old 09-04-2010, 07:59 AM
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While true for virtually every other vehicle on the planet, the Alfa LSD does not do this; turning one wheel in one direction will have the other wheel turning in the opposite direction, just like a non-LSD (open) rear.
Just to add a little more to papajam's comment, if the other wheel does not turn the opposite direction, the LSD has been set up incorrectly. The stock LSD is designed to only lock up when torque is applied. The torque causes the spider gears to "spread", loading the clutch stack.

Erik
'66 GTV racecar, '71 Spider racecar, '74 GTV street car, '71 GTV project
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post #38 of 47 (permalink) Old 09-04-2010, 10:04 AM
The other part of his question was if you can tell externally what ratio is inside and I believe the answer is no, there are no external markings to tell what gear ratio a box is. I suppose the only way to do that would be to spin the pinion and count the rotation of the axle.

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post #39 of 47 (permalink) Old 09-04-2010, 12:40 PM
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Incorrect. A 4.3 differential should have a red splash of paint on the input coupling. Richard Banks at Alfaholics told me that a few years ago. Therefore it may stand to reason that there were other colour 'codes' for rapid identification at the factory, but that would just be conjecture on my part. Perhaps others know more?

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to all parts I have advertised on the BB so far. Plenty more! Just ask.
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post #40 of 47 (permalink) Old 09-04-2010, 06:14 PM
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Incorrect. A 4.3 differential should have a red splash of paint on the input coupling. Richard Banks at Alfaholics told me that a few years ago. Therefore it may stand to reason that there were other colour 'codes' for rapid identification at the factory, but that would just be conjecture on my part. Perhaps others know more?
For what it's worth, none of my diffs (4.10/4.30/4.55/4.78/5.12) has any color markings. But it isn't that hard to count rotations.

Erik
'66 GTV racecar, '71 Spider racecar, '74 GTV street car, '71 GTV project
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post #41 of 47 (permalink) Old 09-06-2010, 07:57 AM
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Alex is right. I guess Richard told about the color marks not on the dif case but in the pinion's end the one to propeller shaft. All Nos Crown&pinions I've seen or have, had this color marks. Mostly are green, I can recall 1-2 red and I guess also saw one yellow?
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post #42 of 47 (permalink) Old 09-06-2010, 02:38 PM
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For what it's worth most 2000 series 105's were specified standard with LSD's down in this part of the world. GTV's and Spiders had 4.1 and Berlina's had 4.3 ratios respectively.

Of course that doesnt mean all the cars actually had them fitted but it does mean most of the 4.3's were picked up years ago and many of the LSD units ended up in 116 series GTV's and GTV6's.

Last edited by Aggie57; 09-06-2010 at 02:40 PM.
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post #43 of 47 (permalink) Old 09-06-2010, 03:02 PM
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In Europe all 2000 cars had LSD units, too. However, I'm not sure if the picked units gone finally to 116 cars, I guess they've been different.I have the feeling that the pinion gear was longer.
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post #44 of 47 (permalink) Old 09-07-2010, 06:53 AM
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Incorrect. A 4.3 differential should have a red splash of paint on the input coupling. Richard Banks at Alfaholics told me that a few years ago. Therefore it may stand to reason that there were other colour 'codes' for rapid identification at the factory, but that would just be conjecture on my part. Perhaps others know more?

Argh! that would have been handy to know before I sanblasted the diff...

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post #45 of 47 (permalink) Old 09-07-2010, 09:29 AM
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as for these marks, I assume also the inside pinion (as previously mentioned) must have the same mark like the mark on the flange. Or, finally we speak for exactly the same since the pinion's end mark could be seen from the flange...
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