TA sells a 2 piece neoprene or viton rear main seal for the 300, it requires the seal journal to be cut down to seal properly. Nominal OEM dimension is a bit over 2.650", (the diameter required for the TA seal is 2.570-2.600". I just turned a blank in the lathe to fit the seal and that is what I get, the 2.600" dimension is a bit on the tight side shown below. The 2.570" dimension will have less drag and probably seal better.) Incorrect! See post below. YMMV, do your own testing. I'll not be held responsible for leaky seals. Jim
Put it in the groove in the rear bearing cap and see if 2.570 still looks better, it all depends on how much the groove changes it. If the ends of the seal are at or above the face of the bearing cap the ends will be together no matter which diameter you choose. Which ever one you end up choosing, polish it like chrome.
Fortunately I made a mistake here. The TA seal does fit correctly, my measurements were off. Hey, it happens. I'm just glad I caught it before turning down the crank seal journals too far. Unfortunately, I now feel a need to apologize to TA Performance for this miscue. The range appears to be approximately 2.650-2.670" so their instructions to grind just far enough to remove the hash marks would be correct. Jim
