Not Ranked
I have a side oiler too (640/589 before I changed the cam, now I'm guessing 610/610 with the new cam). 4 speed looks more correct. 5 speed probably a better trans and driving experience. My TKO600 is 0.83 OD and my rear is 3.54 but I don't drag it. 5 speed is good but I almost wish I had a 6. 4 isn't enough IMO.
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