depends on what you're doing, if you just open up the tranny and look, like a 3.
if you want to swap out the diff for a lsd, then probably like a 5 or 6. if you want to replace a gear or synchros maybe as high as a 7 or so.
to replace the gears or synchros you're gonna have to use a press to pull the gears off, if the GSR tranny is set up like a d16y8 tranny and all you want to do is replace 5th then you'd press of #'s 6 and 94 and press on your replacement. might as well replace the synchros and bearings if you're at that point though.
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