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The pump mod is to more quickly evacuate the fluid from the front side of the torque converter so piston apply is a little quicker (firmer). The tube that is installed uses the pump inlet to create suction, rather than just let it dump into the main trans cavity unassisted as the T/C piston moves to apply. Although I have always installed the pump kit for people with the Precision and have done it to my own car, I don't feel it's absolutely necessary. Unless, you really need that T/C clutch to apply as firm as possible to ensure it doesn't burn during some nasty, mongo, monster HP pulls. The lockup with the Precision is very quick and harsh. If you do put the pump kit in, you may wish later that you hadn't if this is mainly a street application.
I have left the fitting out of numerous cars with no ill effects. I've even removed them for some customers who asked me to. In my opinion, there is much more chance of them doing harm than good. Believe me, you won't be able to tell the difference in the harshness of the apply of the TCC.
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Donnie
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