BByrd,
There are several different choices for "Limited Slip/Locking" differential carriers.
Auburn
cone type clutch differential
Easily available
Best Warranty--4 years
works very well
% slip varies with temperature
Detroit Locker
original to Shelby GT350
Terrible to drive
Totally NOT recommended
not affected by temperature
Detroit True Trac
Gear type differential
Harder to get a hold of
Works well
not really affected by temperature
Quaiffe
worm gear type differential
absolutely the best to drive
almost impossible to get a hold of
extremely expensive (like $2000 for the differential alone)
minimally affected by temperature
Power Lock
Original to the AC Cobra
clutch type differential
comes in 2 versions--2 spider and 4 spider. 2 spider units are worthless
works quite well
very inconsistent to get a hold of
% slip varies with temperature
Spool
no slip action--permanently locked
very cheap
terrible to drive on the street
not affected by temperature
3:73 gears were original (actually 3:77) to 289 and 427 S/C Cobras. In our cars, small block guys who are crazy get these as the engine winds up pretty quickly.
3:54 gears are original to Cobra 427 Street Cobras and late 289 street Cobras. In our cars, they are usually used in small block cars that want to be pretty tame.
3:42 is by far the most popular gear ratio with a 5 speed and a 427 engine. About 95% of our differentials are this gear ratio.
3:31 gears are most popular for guys with top loader transmissions with wide ratio gears.
3:23 gears stink in my opinion
David
