I have a 93 5-speed Hardtop, instead of going through the whole 6-speed swap again, very expensive I might add, I was thinking of a R154 and beefing it up. Well, I started thinking why dont I use my existing tranny (W58) and beef it up. Is there a big diffence between the two? Can you even beef up the W58 tranny? Do I need to do any modification to the driveshaft? I know with the R154 you need a front shaft from the MKIII and have the back custom made. How much could the W58 take? Boost Logic will rebuild the R154 and say to be able to handle up to 700 plus rwhp, I wonder if the W58 can do the same. Has anyone gone through the same thing? Please advise.