[williamoss]

Has anybody bought a 1995 MO3O limited slip differential transmission on line and what is the approximate cost of one of these.

And what would be an acceptable amount for the labor to remove the old one and install the new one?

My 1-2nd syncromesh gears are getting bad.

Just out of curiosity I called Susnset and found out that wile the price could be $7,800 they are no longer available for Porsche Direct. So any other suggestions?


William Moss
Tigard OR

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[kwikt]

I picked one up a few months ago for $2000. Installed it myself on a Saturday. Actually there is a diyer on the other forum. It is a pretty simple job.

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[flash]

ok - first off, M030 did not mean that it had limited slip - that was a separate option, that could be either with or without M030 - in 95 that would have been the torsen diff (as opposed to the earlier clutch type) - the option sticker would have indicated "220"

you can usually get them on ebay for about a grand - i know somebody here locally who has a good used one out of the trans and in a box that they would probably sell

this would have nothing to do with the synchros though, and that would require a rebuild

are you sure the synchros are going bad? - they aren't all that great brand new, and gear matching is really required for smooth shifting, even more so with a light flywheel, and even more with a heavy pressure plate (not sure what you have in there)

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[kwikt]

There is a standard 6-speed on Pelican parts classified for $1000.

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[williamoss]

[quote name='flash' date='Jul 31 2010, 11:32 AM' post='96630']
ok - first off, M030 did not mean that it had limited slip - that was a separate option, that could be either with or without M030 - in 95 that would have been the torsen diff (as opposed to the earlier clutch type) - the option sticker would have indicated "220"

you can usually get them on ebay for about a grand - i know somebody here locally who has a good used one out of the trans and in a box that they would probably sell

this would have nothing to do with the synchros though, and that would require a rebuild

are you sure the synchros are going bad? - they aren't all that great brand new, and gear matching is really required for smooth shifting, even more so with a light flywheel, and even more with a heavy pressure plate (not sure what you have in there)

Yes I know that the MO3O was a seperate item as well as the limited slip. I just put it in for a better despription. And yes my car has both. AS for the clutch mine has a normal clutch not a light weight. When I shift directly from first to 2nd the is gear grinding. The way that I avoid this is by taking it out of first, hesitating a1-2 seconds and then going to 2nd. Then it meshes smootly. Going from 2nd to first is the same. If I double cluth then I can go directly in either direction without the 1-2 second hesitation.

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[flash]

ah - cool

grinding - not cool

what you describe is not an uncommon condition in east coast cars in the winter - once it gets warmed up, it gets better though - is the problem you are experiencing both hot and cold?

have you tried a thinner or slipperier fluid?

could be the hub and not the synchro itself, as i understand those wear out, but the resultant fix is the same - rebuild

major bummer

in the event of needing a rebuild, i recommend california motorsport (though they are now in arizona) - bobby is the man when it comes to this box - he has a deal with yellow freight too - the last time i talked to him about a box, his price was $750 labor plus parts to do one - shipping extra - R&R obviously extra

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[blue968]

HI Guys,

I am experiencing a similar problem and you had suggested a try a thinner or slipperier fluid. Can you give me an example of 1 that I could try? Should I use a synthetic and what viscosity?

Thank You

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[bob blackwell]

Blue968, I have used SWEPCO 201 in my transmission for several years. There was an improvement in the shifting action when I changed from the standard gear oil. Good luck, Bob Blackwell.

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[kwikt]

I do have a 6 speed non lsd with good synchros but whiney pinion if interested.

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[blue968]

Thank You Bob, I will try it.

Thanks again

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[williamoss]

What would be the long term effects of using a thinner gear oil than the weight that was recommended? Would there be additional wear and tear? The car originally was an East coast car, now residing in Oregon on the West Coast. The shifting does get better with driving after it heats up somewhat.

William Moss
Tigard OR

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[flash]

well, you might eat things up if you go too thin and are driving hard - that thing gets pretty hot - i don't know what oil is in there, but something really slippery like swepco or something might help

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[jfrahm]

I thought for grinding (worn synchros) you want a non slippery fluid so the synchros drag and match the gear speeds. Redline NS and the like. These oils lack the friction modifiers that are generally needed for an LSD however (not a problem if you lack the LSD.) If the synchros spin too easily they cannot force the RPM match of the gears and so you get bump and grind going into gears if you do not rev match. When worn out they simply need to be replaced but less slip/more drag will crutch them a while.

-Joel.

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[flash]

well............

i'm only guessing that the synchro isn't spinning fast enough, as it matches better when he pauses between shifts

the problem is the cold condition - if it gets better when warm, then a thicker or more tractive fluid would only exacerbate that - if the problem was consistent regardless of temp, then i would tend to agree

easy enough to try both though and see what works best - first thing is to figure out what is in there now

but again, it may be the hub and not the synchro

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[jfrahm]

In the case of simple poor cold shifting I would not suggest going to a thinner than OEM fluid but rather a fresh fill of a quality synthetic. And an NS fluid IMO would be appropriate if there is no LSD fitted. Perhaps a thinner fluid would be appropriate for a significantly colder climate but modern synthetic gear oils will flow well far colder than equivalent dino juice.

-Joel.

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[flash]

agreed, assuming the oil in there is either wrong or old - the first thing i would do is call pete to see what if anything was done there, since that's where the car came from

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[williamoss]

Thanks for all the suggestions. Picked up the car today and the shifting feels smoother with the Swepco in it.

William Moss
Tigard OR

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