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2nd And 3rd Gear Crunch

Daboss

By Daboss,
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Daboss Experienced

Daboss

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Hey All I just got a 95 r33 gts-t and I performed a service on it with the help of this forum Thanks to all and the tutorials. Until now everything about the car was great now all of a sudden I am felling a lil crunch from 1st to 2nd and from 2nd to 3rd and they are the only gears I feel it in funny thing is its only when the rpm is above say 2500 if I am just cruising and I shift from 1st to second it feels normal and from 2nd to third feels the same as well but when I'm accelerting it crunches as mentioned b4. I didnt start to feel the crunch until afer I changed my gear oil as a part of the service didnt know what was in it b4 but I put in castrol gear oil 80w 90 and then I drove it a bit hard to allow the oil to work its way through the gears. Like I said I didn't notice a crunch b4 but now I do after the gear oil change during the change there wasnt any metal chunks in the oil just a a fair amount of metal shavings but the gear oil was probably ever changed b4 and i dont know how long it had been in there. The crunch is not really loud more of a feeling than a sound but if you are listening for it you will hear it. Does ne1 have any solutions for this. I read something about synchros needing to be changed but I cant afford that right now and was wondering what else would be a quick fix.

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mad082 Grand Master

mad082

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ok, well the crunch is a mix of using a different oil, and the fact that the gears are worn. the first 3 gears are used the most, since most of these cars only ever do city driving in japan. also that fact that when people race around and snap change gears it is usually done from 1st to 2nd, and 2nd to 3rd.

if you went to a good oil, like redline or something like that, it may quieten down the crunch. but most manual cars that have had a bit of a hard time make the same noise.

Daboss Experienced

Daboss

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ok, well the crunch is a mix of using a different oil, and the fact that the gears are worn. the first 3 gears are used the most, since most of these cars only ever do city driving in japan. also that fact that when people race around and snap change gears it is usually done from 1st to 2nd, and 2nd to 3rd.

if you went to a good oil, like redline or something like that, it may quieten down the crunch. but most manual cars that have had a bit of a hard time make the same noise.

So the only way to really get rid of the noise would be to what change the gearbox or the synchros? If I where to put in a thicker oil would that help because I live in the Bahamas and we don't carry the redline stuff.

Godzilla32 Veteran

Godzilla32

Posted
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So the only way to really get rid of the noise would be to what change the gearbox or the synchros? If I where to put in a thicker oil would that help because I live in the Bahamas and we don't carry the redline stuff.

A thinner oil will make it easier to shift, not thicker. Some guys use ATF (auto trans. fluid) in their gearbox because its very thin and makes shifts much easier. The proper way to fix the problem however is to strip the gearbox and replace the worn syncros. However this isnt a cheap excersize if you have to pay for both parts and labour. Might be easier to buy either a reco'd box or a 2nd hand one. Upto you...

Id suggest trying thinner oil first. You probably replaced the oil that was already in there with thicker oil and that brought back the crunches.

Hope this helps,

Deren

:)

Daboss Experienced

Daboss

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Ohh that probably was my mistake I thought I read to use a thicker oil thats why i got the 80w 90. Damn so let me get this str8 try to replace that with a thinner oil not thicker? Cus I could have sworn the tutorial said to use a thicker oil.

Daboss Experienced

Daboss

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Yep, thinner the better, I had those crunches and replaced the oil with some Redline Shockproof and viola, crunches go bye bye :P

Ok so like I stated earlier dont think I have the redline stuff over here being from the bahamas, what oil weight what you recommend getting instead I put in Castrol 80w 90 and will putting a gearbox additive help or add to the problem?

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