sorry I missed your post. No modifications that don't bolt up. Billet flywheel. McLeod duel disk clutch 1000+ hp. Mcleod hydraulic T/O bearing. American Powertrain SFI bell housing, I polished it. Tremec TKO 600 with the higher first gear option (because of my torque) and the lower overdrive option. I have 128 rear end gear options with my 4:11 ring and pinion that I can change in 10 minutes. Custom shifter and about $800 worth of internal upgrades that I don't understand. I will be running a carbon fibre driveshaft for weight and mostly to take some of the shock off the rear end. The Frankland factory (thanks Fred) made me a custom quick change with a Gleason Torsen diff. I'm running leaf springs with a Bicknell adjustable torque arm with triple biscuit and panhard bar, sway bar. Sorry so long. Thank you for your time.