Gearbox Crunch!

[pac34r]

Hey guys so this is what's happening.

When changing from 3rd to 4th i can feel and sometimes hear the gearbox grind a little. Does not feel healthy at all. Was wondering if anyone could shed some light. Have read a little bit of information regarding the issue. But still don't fully understand. Could changing trans oil do anything? Could a possible leak cause this problem?

My foot is fully depressed on the clutch so that is not an issue. It's only 3rd to 4th no other gears and at a higher rev or speed.

Thanks guys any opinions and information would be appreciated.

[R31Nismoid]

Worn syncho's

Try changing the oil to redline shockproof. If that doesn't fix it, then only was is a box rebuild.

[pac34r]

thanks i'll try get round to that this w.e. any idea of price of redline shock proof and where i can get it from?

[pac34r]

ok had a little look. does $180 sound about right? also from reading. I'm thinking of opting for redline heavy shock proof

http://www.shiftperformance.com.au/product_info.php?products_id=764&products_name=RedLine%20Heavy%20ShockProof&category_name=

[endless]

http://www.performancelub.com/ - Harold or bust

Get the shockproof.

[10 4]

Worn syncho's

Try changing the oil to redline shockproof. If that doesn't fix it, then only was is a box rebuild.

http://www.performancelub.com/ - Harold or bust

Get the shockproof.

/thread

[pac34r]

Got shockproof and it's amazing. Still a little crunchy when shifting but not too bad. So i guess a future re-build will be in view. Any ideas on how much this will cost?

[Abe2]

A SHIT LOAD

Buy a used box

and buy a second hand one with a blown part ( no the one you want clearly) and do it yourself

ruffly 1300 for a rb25det gearbox

[Thelen]

its actually not that bad for a rebuild, if you take it out urself and deliver it to them. its about a 4hr job to get it in and out of the car, so that is where a lot of the cost will go. the actual rebuild itself shouldn't take more than about 4hrs, then you can make sure to use performance parts to make it laaast.

paying $1300 for a 2nd hand one, even if they think it is in good condition, is a risky endeavour imho.

[KiwiRS4T]

If you pay to get your box fixed ask the builders what they think about Redline heavy weight shockproof. Redline don't recommend it for gearboxes ( they do suggest the light weight shockproof for worn boxes) i don't know why people do on these forums -I guess its akin to putting sawdust in - it quietens things down for a while but stuffs your box.

[10 4]

If you pay to get your box fixed ask the builders what they think about Redline heavy weight shockproof. Redline don't recommend it for gearboxes ( they do suggest the light weight shockproof for worn boxes) i don't know why people do on these forums -I guess its akin to putting sawdust in - it quietens things down for a while but stuffs your box.

No one says put in heavyweight.

Lightweight is recommended for crunches.

[89CAL]

FYI, doing all the work at home I think my rebuild cost about $600 - $700 (around that anyway). That was a bearing/seal kit, new 2nd and 4th gear synchro From ATC and the energizers etc from nissan.