25 Box Crunches 5th

[AE86 Spoontah]

Hey guys, I'm new to the Nissan scene as you could tell by my user name, and i need some help.

Have a 25 box in my 32 GTST and it crunches 5th gear a bit. I've noticed it usually only happens once the oil is up to operating temp or i change from 4th to 5th above 3000rpm. If i double clutch into 5th it never crunches. Could my syncro be worn out or is the oil due for a change.

Any advice appreciated, Brendon

[lachlanw]

check the oil level is a good start.

[Moodles2]

Change the gearbox fluid, might be as simple as that.

[Birds]

As above but most likely a worn synchro. It happens.

[RRR31]

You could do the cheaper option first and change the oil to redline gear oil i used the red heavy duty one in my old r31 turbo aus compliance it had a crunchy second after driving around slowly and sympatheticly for a while it seemed to feel smoother each day of driving. Then it stopped crunching even on a 6000rpm fast shift but it was always on my mind it was only ever going to buy some time.

A rebuild is the only way to realy fix worn parts or try the cheaper option tube of nulon first.

[s13_Skyline_inside]

there is a nulon gearbox aditive thats quite good. that'd be the cheaper option, my gtt gearbox was a bit notchy into 1st and 2nd when cold but that stuff fixed it right up, now it is very smooth

Edited December 15, 2009 by s13_Skyline_inside

[ahh 33 s2]

has any one had there synchros fixed, as mine is bad in 5th always and bad in fourth when racing,

any one have a ruff idea of price?

thanks Dan

[bigmikespec]

Redline lightweight shockproof helped my a lot, but is just a band aid I guess.

[Harey]

mine occassionally crunches 5th but its only when i try and change pretty quickly to 5th under power. If I slow the change down or take it easy then its fine.

[Don Dada]

Redline Lightweight shockproof.....magic in a bottle