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Bad Synchro Or?

thebuuuuu
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thebuuuuu Explorer

thebuuuuu

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Posted

i just bought r33 recently, and i dont trust the previous owner..

car is bone stock..

i just change all of the oil recently. engine, tranny, diff..

i use MT90 for tranny..

the problem its sometime grinding when i shift into 3rd gear, and sometime into 4th gear, but only happens on high rpm. it annoys me so much.

and when i change my tranny oil, i found some metal filings on the magnet plug but not much.

its shifting normal on low rpm..

is it bad synchros or worn out clutch?

those issue happens just before i change my tranny fluid.

if its bad synchros where is the recommended place in sydney and how much in total?

because its a hard job, if its clutch i can do it my self.

thank you.

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89CAL Grand Master

89CAL

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I'd try some redline lightweight in it first. Having pulled a 25 gearbox apart, they are fairly labour intensive. I had a few shift problems and redline seemed to help, would be much cheaper then a box rebuild and it might work. For $100 or so, its worth a go

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scotty nm35 Grand Master

scotty nm35

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I'd try some redline lightweight in it first.

The teflon can break down after a while and clag up the syncro's making them worse. I only use the lightweight shockproof in diffs and (evo) transfer cases for that reason.

I would be running fresh light gearbox oil, as someone may have just filled it on thick oil. They need to be able to spin up freely to mesh at those revs. You could try Dextron3 too before shelling out for a build...

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thebuuuuu Explorer

thebuuuuu

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Posted (edited)

i havent try that surfs blood thingy. wanna try it, but i just change my oil.. huh..

btw piggaz i call them recently, they charge me 1700 for labor excl. parts.. damn expensive.. but the gearbox still attach on the car, if not idk..

i can remove the box and send to them but i cant reinstall it.. dont know how to lift it, kinda super heavy.. lack of tools..

any reasonable suggestion for rebuilding?

1700 excl. parts, better i buy rebuild second hand one..

Edited by thebuuuuu
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-Tom Community Regular

-Tom

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I've had the same issues and redline lightweight shockproof ( surfs blood) made them go away. Might not be a long time fix but, mine was fine for couple years after that.

If you really want to rebuild try Competition gearboxes

Pretty sure my syncros are screwed too. I put in Redline Lightweight Shockproof and it still grinds a little at first but once it's all warmed up it shifts fine. I just double clutch till it's up to temp.

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GTSBoy Grand Master

GTSBoy

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By the way....I love threads like these. The synchros in my gearbox are absolutely thrashed. So badly that when it was first installed it would not engage any gear with the engine running until we swapped out the normal (new) oil for smurf jizz. It got better as it was driven, but the synchros are still thrashed.

And I NEVER get a crunch on a gear change unless I've made a massive fuctercluck** of it. All you have to do is know how to change gear to avoid the crunch.

**fustercluck - when you lose all muscular coordination and make a gearchange that a recently raped chicken could have done a better job of.

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