Just wondering if anyone has had their tko600 upgraded to handle more power or bought an upgraded one from mmr or promotion. Mine is 2 years old so I want to get the 2-3 shift problem fixed also. I'm looking for input on either company and/or and other company that upgrades the transmissions. My old setup in my 93 lx was a 347 with a t-trim making around 600 rwhp/tq and I'm building a 331 with ported victor jr heads and a 80mm turbo so I'm hoping to make a little more power.
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