Throw Out Bearing
Next up is removing the throw-out bearing and replacing it with a new unit, if for some reason you’re reusing a used clutch then make sure to buy a new one of these. They are relatively inexpensive and will save you the hassle of having to drop the transmission if they fail. To remove it, pull on the assembly and the rear clip will pop off the arm and the bearing will slide off.
The bearing is press fit onto the housing so find a proper sized diameter socket and hammer it off. Use a similar method but with a larger socket and LIGHTLY tap it back on to reinstall it. You don’t want to force it and break it.
Slide and wiggle the transmission into place, it may take a couple tries to get the splines to line up with the clutch and if you need rotate the input shaft a bit if its not sliding in. Tighten the transmission bolts up to 22-29ft-lbs.
Nismo Engine and Trans Mounts
Although this upgrade isn’t necessary I highly recommend it. The old SR motor mounts are likely to have a lot of play in them. If you are building a car for any type of performance then stiffer motor mounts will benefit you. Less engine movement means more of the available power is going to be delivered to the rear tires instead of being wasted by excessive engine and drivetrain motion.