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I have a stealth trans that appears to be locked..it has a hole drilled through the spur gear into the back plate..is this normal and what would you gain from it?

My guess is nothing except a locked transmission.

So it must have an effect on performance?..what advantage would there be?...

I don't think it will improve performance overall. The slipper is there to make the car more manageable on the dirt when you put the power on in corners and on. It might accelerate better but I doubt it.

Anyway, those are my thoughts I'm sure most of the guys on the site are far more qualified to comment. How about a pic

if there is only a screw on one side of the slipper i could see a balancing problem that could cause connecting parts to wear out a bit faster. but then again most offroad guys are not as anal about balancing the car out as the onroad guys are. for me.. well i'm that anal

Guys have been using slipper clutch eliminators on oval cars for years; it looks like the slipper back plate with two holes for the spur gear, and is machined to remove as much weight as possible. Except for the start of the race you don't really go slow enough for the slipper to actually kick in, and it does save a lot of rotating mass.

Just locking the slipper clutch doesn't make much sense, especially if you leave the rest of the components on there, but you'll find a lot of things like that on used cars. I call it 'gomer engineering'.