r33 new clutch and gearbox figment problem

[Vasilli123]

After a lot of headache asking for help, I have a r33 rb25det motor ( block number confirms) I got a rebuilt gearbox with changeover. Old gearbox had noisey bearings and crunchy 3/4 shifts, with a brief visual they looked the same. I upgraded from a exceedy sport tuff h/d clutch also has fitted a exceedy lightend flywheel to a NPC 300rwkw capable clutch for future mods, after fitting the new gearbox after elongating some bellhousing Bolts, slightly off compare to old mostly the bottom ones going through the backing plate.... there was excessive clearance between the clutch thrust bearing and touching the pressure plate.

 clutch slave cylinder push rod wouldn’t fit, after using NPC guidance there was 24mm clearance between, which they’ve never heard of, after fitting a longer thrust retainer to remove the clearance down to 6mm the clutch wouldn’t fully disengage, in gear foot on clutch turning the tailshaft clutch could be heard dragging and had abit of resistence to turn, whilst driving it was crunchy

 there was 10mm height difference  on pressure plate clutch fingers when bolted to flywheel between clutches

after drivability problems I decided to play around with spacing the clutch fork pivot and decreasing clearance down to 4mm but the NPC clutch still was dragging, so I decided to fit the old exceedy clutch that was working (now has been sitting for awhile) I fitted all the original parts from the old gearbox thrust retainer, removed clutch pivot ball spacing, now this clutch wouldn’t disengage at all, so I’m at a loss help....

summary 

rebuilt gearbox with new oem front plate where thrust retainer slides on

new clutch slave cylinder, bolt pattern one on top one on bottom

NPC 300rwkw clutch 

exceedy lightend flywheel 2mm difference overall height difference to factory flywheel 

apparent auto to manual converted 

new clutch pedal box 

everthing bolts up the same except for lower bellhousing bolts and starter motor needed to be elongated 

 

[Vasilli123]

Also the gearbox came with a clutch fork pivot already fitted, what’s the correct way to measure it, nismo has 54mm heavy duty ones to fit r33, would you measure from top to bottom or from the base that’s touched the gearbox to the top of the pivot ball 

[wildeagle44]

Was your flywheel new? Or if used have you had it surfaced?