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Originally Posted by cody
MY05+ have the 2.5L and I believe that's when they went to a taller final drive gear or something along those lines. It put more stress on the gears. Again, more info on that is available on the Unabomber's Tranny FAQ.
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I have also done a ton of reading on the subject and it makes total sense that its the shock load that eats gears
not how much power your car has. My car had almost 60k on it before I bought it so I really can't say how it was driven. Since I have an 04 it says my car came with the thicker RA width gear set so it should be stronger than the 02-03 trans. If I had to do it all over again I would have waited longer and saved more money to get a low mileage sti or a new wrx. I think its MY06+wrx not the 05 that got the 2.5l and the 6% load increase because of the new 3.70 final drive.
Quote:
Originally Posted by sperry
The WRX tranny isn't all that much stronger than the L tranny IMO. It's not 'till you get into the 6MT that you've got a gearbox with the primary issue fixed that's wrong with the other boxes: the case design. The 6MT uses a cylindrically split case, while the WRX/L uses a longitudinally split case which is significantly less stiff, allowing flex of the gear shafts. The only way to make a 5MT strong is to use retard strength gears that can resist the misalignment they get when the case flexes.
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I read this about case flex:
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The front transmission section houses the gears and is opened by removing the left and right half shells to expose the gears. These shells are bolted to each other as well as held in place by being bolted to the engine block and the rear transmission section which is another solid piece. Looking at the construction, it is impossible for the housing to flex.
Even if flex occurred, the gears sit on top of each other, so if flexing to any degree occurred, the gears would actually come together firmer due to gravity than apart as some contend. The premise of case flex when looked at from a construction aspect is a moot point and aside from the evidence listed here, there are any number of other reasons in the internal construction that any transmission professional can go over in further detail.
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