GV is about 3k. That's better than the $5k for the Tremec. However the GV has more modules/switches that have to be mounted and I'd prefer the stock look or have them hidden.The gear vendors is a tough unit , works very well & you can shift to od in any gear resulting in a 8 speed , this would be my first choice .
It would depend which tremec you are looking at , the Viper T56 Magnum or T 6060 are great , not a fan of the TKO so much notchy to shift at higher RPM
GV makes OD for stick toouh oh your tearing into already. I thought about this also. If I were to go with a stick shift I would use tremec T-5 hydraulic clutch. But, you will have about 6,500 when done,but it will be cool. If I were to stay auto I would use 200R4 and have Wilcap make an adapter. I wouldn't use G/V shitty final O/D gear ratio. Sorry just saw you already have a 4speed you wouldn't have to spend that much. I would stay with a stick over auto.
Yes I know But the final gear reduction I believe is .74 Yes they are built great, But if you want O/D go with something that is going to give you a Lower gear ratio in your final gear. My .02GV makes OD for stick too