RB25 transmission disengaging issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

BspeedIL82 · 04-08-2010, 10:57 AM

I finally got my RB swap up and functional last friday. Took it for a legit cruise to test it out and monitor some things.

Heres the issue I'm having---1st gear falls out with acceleration. 3rd gear will only fall out after boost or acceleration with elapsed time, and 5th gear is somewhat tricky to hit at times-causing me to grind gears. 2nd, 4th and reverse are fine.

Auto to 5spd swap. Hardline to Braided line.
I have rebled my clutch.
I have a new shifter bushing on the way cuz the old one doesnt look very good.
I have a centerforce s2 clutch--roughly 7k miles. New 300zx TOB.
New TOB sleeve from nissan for the 300zx.
I have contacted the company in regards to this issue since i JUST got it running and we are in the process of trying to figure out areas to address before jumping to the bad trans conclusion. Im really hoping its a component issue and not a trans issue...
Any help would be greatly appreciated.

04-08-2010, 10:57 AM	#1
BspeedIL82 Zilvia Member Join Date: Jun 2009 Location: Bloomington, IL Age: 42 Posts: 186 Trader Rating: (4) Feedback Score: 4 reviews	RB25 transmission disengaging issue I finally got my RB swap up and functional last friday. Took it for a legit cruise to test it out and monitor some things. Heres the issue I'm having---1st gear falls out with acceleration. 3rd gear will only fall out after boost or acceleration with elapsed time, and 5th gear is somewhat tricky to hit at times-causing me to grind gears. 2nd, 4th and reverse are fine. Auto to 5spd swap. Hardline to Braided line. I have rebled my clutch. I have a new shifter bushing on the way cuz the old one doesnt look very good. I have a centerforce s2 clutch--roughly 7k miles. New 300zx TOB. New TOB sleeve from nissan for the 300zx. I have contacted the company in regards to this issue since i JUST got it running and we are in the process of trying to figure out areas to address before jumping to the bad trans conclusion. Im really hoping its a component issue and not a trans issue... Any help would be greatly appreciated.