My 11’ Auto had an open RC33 from the factory; later added a Quaife...better traction.
Cruise would max out at 90/3000rpm’s.
I later swapped pumpkin with a 13’ Nismo, that had the 3.69 gears & it was a direct swap~ as my stub shafts were threaded & so were the 13’ model.
Speedometer was dead on still; as speed reads off the output stub shafts toner ring sensors...Cruise control would work normal; until the tachometer would get near 3k & speed wouldn’t be near 90...then it would go off & cruise light would flash.
After cycling ignition/ everything was normal again.
Just be prepared to recycle ignition if you blast it down the road....even if you don’t have cruise set/ somehow it will recognize a speed vs rpm fault.
Never checked into weather or not a tuner could reprogram ecu for this
