3S-GE JDM Non-Turbo Engine S54 Transmission: no.2 Lockball [Archive] - Toyota MR2 Message Board

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I have a S54 from a ST202 JDM Celica, and a S54 from a SW21 USDM MR2. I noticed that, besides the obvious difference of the selector shaft coming out the other side on the SW21 S54, there is also this no.2 Lockball which is not present on the ST202 S54. So the ST202 S54 has just one lockball in the casing, but the SW21 S54 has two lockballs in its housing. Any idea why this is so? I can see that the no.1 lockball exists so that when the gear selector shaft rotates the movement is made