[Shotimes] LSD Conversion KIT for the SHO? Any comments?

[Mike Kopstain]

> Has anyone heard of similar failures with other FWD cars
> like the GP or Neon or the Nissan FWD cars without posi?

Don,

GTP's like to do the same thing, typically not until you're pushing 350+
ft/lbs of torque though, and even at that, it typically happens when you are
drag racing, due to the car having 80% of it's torque at 1000rpm. :-)  The
nice thing however is that the differential usually only grenades itself and
just scars the inside of the house and it is replaceable in about 1.5 hours.
The real problem is the input shafts, don't get me started on the input
shafts. :-)

I've seen you comment a couple times on the differential in the ATX's.  The
ATX differentials seem a lot stronger (That's about all the ATX has up on
the MTX) and I've never heard of a pin failure in an ATX, not to say there
hasn't been one.  The only failures I've seen are the carrier bearings.
They seem to be dead in my 95' right now.  Do you document these cases?  I'd
be curious to see how many ATX differentials are spilling their guts.

Neno... You are a very articulate, inteligent person for your age... I never
would have thought that after that post once upon a time. :-)

~ Mike

Midwest SHO - For Everything SHO
www.midwestsho.com
Sales@Midwestsho.com

Advance Motorsports - For everything else
www.advancemotor.com
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----- Original Message -----
From: "Donald Mallinson" <dmall@mwonline.net>
To: <shotimes@autox.team.net>
Sent: Sunday, February 08, 2004 12:07 PM
Subject: Re: [Shotimes] LSD Conversion KIT for the SHO? Any comments?


> Neno,
>
> Good to hear from you again!
>
> One of the first things we learned about the diff failures
> from the reports I got through this list and through the
> club/conventions is that abuse and burnouts are not always
> the cause of failure.  We have had several diff failures on
> cars that the owner, since new, claims has never spun a tire
> (hard to believe, but I knew some of these people, and they
> drove enthusiastically, but did baby their cars a lot and
> didn't race).  These cars got perfect maintenance and still
> the diff took out the transmission.
>
> Certainly burnouts, slippage in snow/ice, hard racing all
> takes its toll, and there have been notable failures on
> these cars too.  There appears to be no real pattern for
> this type of failure, and it happens to both MTX and ATX SHOs.
>
> Has anyone heard of similar failures with other FWD cars
> like the GP or Neon or the Nissan FWD cars without posi?
>
> I still feel that if you are going to race a lot, a Quaife
> is good insurance, along with feeling great on the track.
> (again, not so much for drag racing as for road racing and
> autocross, my own car didn't seem to get any faster at the
> drags after installation of the quaife.  There is only so
> much traction available for FWD cars, and an open diff can
> quite often apply power to both tires if you have good start
> line manners).
>
> The manufacturer of the diffs had no clue (maybe they were
> just denying something they might not want to be responsible
> for?).  The pins seem to shear, and my best guess is that
> the spider gears tend to gall on the shaft and shear off the
> pin.  Others have said they think the pins work their way
> out.  Same result either way.
>
> One possible cure is to replace the soft steel roll pin with
> a bolt that is threaded on and loctited.  This is a rather
> expensive proposition requiring a good machine shop.  and
> you still have an open differential.  For my money, the
> Quaife is still nice insurance.
>
> Don Mallinson
>
>
>
> Neno Albert wrote:
> > It comes down to a coin toss, Erik.. I beat the living bejesus out of my
'91 AND my '89.. Both
> > have/had solid diffs. My '91 was the first car i've ever owned to
myself... Rod bearing took it's
> > life. Ran organic it's entire life, which just so happens to be the cure
to the common bearing
> > failure to many. That SHO had 136K on the odo... First 60k done and the
second done roughly 900mi
> > before it's death. My '89? Neither blew up, yet... However i've manage
to mangle the clutch with
> > the SHO shop 3.2L. My buddy has a '91+ that has gone through 3
completely rebuilt trannies... All
> > diff failures!!! He doesn't beat his car as bad as I did my '91 and is a
fairly good MTX driver.
> > Odd? VERY VERY much so!!! Even the smokey burnouts won't kill the trans.
The only difference
> > between my driving style and my buddies is that I always compensate for
the one wheel with the
> > load by breaking to the side that doesn't have the load on it and
learning to control the
> > "inbetween" of the power through the feel of the wheel... The bad
bearing? I heard it knock at
> > roughly 2:30PM and she was dead by 3:30~ if not 4 at the latest on the
same day.. yes, less then 2
> > hours.. yes, the worst feeling in the whole wide world!!!
> >
> > Neno
> >
> > --- Erik <masho95@charter.net> wrote:
> >
> >>It all depends on how you drive your SHO.  One that sees burnouts every
day
> >>multiple times a day is more likely to see a differential pin failure
than
> >>rod bearing failure. Just because of the multiple forces of torque on
the
> >>pins daily.  Just my $.02
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