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If you are faced with a transmission rebuild in your 993 C2 non LSD, would you rebuild to stock? or take the opportunity to re-gear. Be interested in what you have personally experienced or have in the plans. And who would you have do the rebuild?
LSD would be first on my list. I recently installed a Guard LSD in my 964 transmission, and it makes a huge difference. Second on the list, steel synchros. Getting locked out of third gear when the car gets hot is no fun. And finally, a re-gear to close the gaps a bit. I’m in the process of doing the synchros and re-gear now on my 964. I wish I had that 6th gear for the highway!
Agree, in order of spend, LSD, steel, then re gear. I have the first the first two already and will be doing the 3rd in the near future. Having ridden in 993s with the 3rd upgrade, it does improve the drive on track and road (at the slight expense of mpg :-) ).
Hi Vancouver z,
For a street-driven car, instead of going to the expense of shortening up the gears, I would learn to value the tall 2nd and 3d gears that make for less rowing in traffic,
Also, there is a reason why the racing synchro rings are not specified for a street-driven car. Some have experienced what they perceive as balky shifting as their geometry is designed to provide very positive locking in a race application.
I also have a concern as to how the gear lubricant interacts with steel vs the yellow metal street synchro rings. Although this concern is based on just a theory I have that the gear lubricant is designed to chemically interact with the steel gears. This interaction creates a hard sacrificial coating that adds to durability but over time may influence the function of steel synchro components if it attaches to these. Street-driven cars may have their transmission serviced once or twice over 200K miles of driving, and I suspect a race car transmission with the steel rings is opened up for service much more often where the long-term influence of the gear lubricant forming the sacrificial coating is less of an issue.
Andy
im in the process of doing a re-gear on my 1995 993. im sourcing all parts now, rs mainshaft, gt gears, upgraded shift forks, etc
i don't plan to purchase the lsd as its a street car only, no DE. not sure it worths the upgrade. wouldnt mind to have more opinions about it.
As 911F1 notes above, the LSD is noticeable on the street as well (canyon roads). Experts like Steve Weiner would tell you that the LSD comes first, before any re-gear. Steve’s advice was always sage.
If you are faced with a transmission rebuild in your 993 C2 non LSD, would you rebuild to stock? or take the opportunity to re-gear. Be interested in what you have personally experienced or have in the plans. And who would you have do the rebuild?
regeat totally treansforms the cvcar but wheher it is worth it to you depends on how satisfied you are w/ what you now have
When I bought my '95 I hated the tall 6th gear, it was unusable 98% of the time
After a number ot track days i was unhappy w/ the short 1 & 2 and the tall 3, especailly on a stret car 1 & 2 can be lived w/ but the 3-8 mismatch of needs led to a replacement
Originally I was going to shorten 3-6 and reallocate drops, this is what most owners do/ It hada stock M220 GKN 25/65 lsd for which i purchased a GT 40/65 to replace it w/.
Then I go lucky and purchased a g50/30 RSR/Cup trans from a neighbor. That is the nuts for track days and great fo street use, maybe w/ a slightly taller 6
Here's a summary of a few 993 6 speeds including some modified as you are considering doing, the nicest street from Porsche was the /21, the /31 from an RS got the taller 1 & 2
07-18-2023, 02:04 PM
993 Transmission Rebuild
