From: Shad Hall [Shad@maine.rr.com]
Sent: Tuesday, October 30, 2001 10:18 PM
To: 928
Subject: [928] I have created a monster

Hello all,  I had lost 3rd gear in my 83 and was looking for a newer
tranny with limited slip and a better ratio than the current 2.20's with
open differential in the back of my shark.  And of course I found nothing
affordable. But I want to go faster and I want Posi.  Well I tear down the
tranny and I had worn the dog teeth down on third gear. Ouch. I have a 78
tranny all in pieces, no reverse but with limited slip.  In looking for
tranny parts I had called 928 east and he said  don't put the 78 tranny
together your car will be slower.  I said how? it has 2.75's instead of
2.20's,it's got to be quicker. He then told me that the 78 had taller
gears in the tranny, and that really wiped out any advantage of the 2.75's
because the final drive ended up being worse than the 2.20's.Little did I
know that that would have been the key to this madness. So I call Jim
Baily to talk about options and what he had experimented with in the past,
liking messing with ratio's and such. First I can't buy just the dog teeth
I have to by the whole third gear.  Over 700 bucks Ouch. So we start
talking about options and we come up with "I've never heard about it being
done but it should work in theory."  2nd 3rd and 4th gears in the 78 have
more teeth than in my 83. That is why even though the 78 has 2.75's in the
back it is slower than my 2.20's. because every tranny gear in the 83 has
less teeth thus faster acceleration.But then Porsche puts 2.20's in the
back to slow it down.(WHY) So I somehow get the dogteeth off the 78's
third gear and it fits on mine. Yeah.  Put all my tranny gears on the 78
pinion gear and they fit, even though the manual and all part numbers say
they wont.(remember the cup is half full not half empty) and use the 78
ring gear and limited slip everything lines up except the last part. (of
course) the tail shaft, well a little modifying with the dremel on some
shims and it is back together. Pull out the manuals to adjust the backlash
and it is done.  Put it in the car and take it out. Now this is a stock 83
4.7    i take it out easy breaking things in and I find myself in fourth
when I usually am in third.  And things just feel wierd. So time to get on
it. Holy crap.  Ist gear dump the clutch and go. and go and go posi rubber
all the way to redline shift rubber to almost 5,000 rpm's in second ,
hooks up, shift to third tires break free again.  wow. doing like 15-20 in
first, floor it tires break free and car will go side ways. Driving in
second you step on it you get rubber. I'm sure I lost some top speed but I
shouldn't be going over 120 anyway. :-) This car is like a knew machine it
is so fun from stoplite to stoplite. Yes I am so excited I can barely
type.  So Jim Baily- in theory and in real life it worked.  And also no
howling from the ring gear and shifts great even with a pryed off dog
tooth gear and dremmeled shims. It is awesome, if only I could of got borg
warner sychros to work somehow it would be perfect. Now I may need a euro
intake and throttle body  ANYBODY?  Let the madness begin

Shad
83s black/black LSD, I wonder if I could add 6th gear?