alright, sounds to me like I should start with a tranny upgrade first then so I dont trash my original one. A 4t60 would come out of what models, and is that the best one you would consider using, or is that just what was available to you?
I have an '03 GL, so if you could, let me know what modifications will have to be made for the tranny in question...(ie: custom mounts, cabling, wiring, etc.)
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