[Shotimes] MTX shifting difficulty hypothesis

[Donald Mallinson]

Justin,

I have one other theory:

When Mike Courtney put in my Quaife, he noticed that my 89's 
tranny had been opened before (wrong color sealant he said) 
and that some shims on the main and secondary shafts were 
missing (also the magnet was gone).  He replaced the shims 
and magnet.

In driving home I noticed that getting into any gear from a 
stop was near impossible, and shifting was hard on the move.

After a couple weeks of this, it didn't get better, I made 
another trip to MN where Mike, to his credit did the right 
thing, took it apart again and took out the shims that were 
making the shafts so tight that they would not move the 
fraction of an inch necessary for the gears to mesh at rest.

As always, my 89 is odd (won't take a chip, Hypertech or 
LPM), funny trans etc.  But I still love it!  ;)

Don Mallinson

Justin Schick wrote:
> I've been through enough clutches (and now a tranny) to start catching
> on to a trend I wanted to share. Most recently, I've posted about notchy
> shifting and hard 1st gear engagement with a new OEM clutch in front of
> my fresh MTX with quaife. Around the time I posted this, there was also
> a thread about a guy inching forward in first with the clutch depressed
> and revving the engine up. Soon afterward I noticed my car do the same
> type of thing, only in reverse at idle.
> 
> My thought was the internals inside the transmission were not spinning
> down in idle, or being spun by too-close tolerances around the fat new
> friction disc. I had previously checked for cable slop but installed
> slotted a washer to shim the cable on the transmission end, thinking the
> adjuster mechanism may need help. No luck. I ordered the delrin ball &
> socket upgrade from SHONut (which showed up today) and some Redline MTL
> (used Mobil 1 ATF during the install) from Summit (showed up last week).
> I changed the fluid yesterday, which helped the slight notchiness
> between gears while moving, but not 1st gear engagement at a stop. I
> developed a workaround for that last week. Assuming the internals
> weren't spinning down in neutral, I decided to spin the engine up before
> trying 1st. After teaching myself this new driving style, viola it
> plunks right in every time. I don't know why it didn't strike me before,
> but it's just like rev matching for a downshift. Kinda.
> 
> Anyway, I'm wondering if anyone with a new clutch and shifting problems
> could corroborate my results. I'm also wondering what the thickness of
> aftermarket friction discs is compared to OEM, and if the problem is
> truly a too-thick disc or something else (flywheel thickness, PP
> geometry, transmission alignment?). What do you think?
> 
> Justin 
> '92 SHO in KC MO, 190k and counting
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