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R33 Gtr Gearbox 4Th To 5Th Crunch

Ishman
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Ishman Enthusiast

Ishman

Posted
Posted

Hi there, bought an R33 GTR a while back but never checked gear changes at high speed. There is a crunch when changing from 4th to 5th above around 130kmh, especially under load. Apparently this is a common problem to check with these cars :( What I'm wondering is- what does this mean for the health of the gearbox? Otherwise it seems fine.

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https://www.sau.com.au/forums/topic/356949-r33-gtr-gearbox-4th-to-5th-crunch/
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Ten Four Grand Master

Ten Four

Posted
Posted

Redline lightweight shockproof gearbox oil.

Get some off Harold from PerformanceHub on eBay.

Mate had exact same problem, the above fixed his.

Not cheap, approx 120ish?? for the oil, but definitely worth it, don't skimp on cheap shit.

Birds Grand Master

Birds

Posted
Posted

Redline lightweight shockproof gearbox oil.

Get some off Harold from PerformanceHub on eBay.

Mate had exact same problem, the above masked his.

Not cheap, approx 120ish?? for the oil, but definitely worth it, don't skimp on cheap shit.

FYP ;)

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

You'll find just about all boxes will if you try too fast of a gear change. Same with my RB25 box in my 31 and the GTR.

4th to 5th demands you be a little slower I've found for whatever reason. It is the smallest gear too remember.

Doesn't do it if you just give it that half second longer.

Ishman Enthusiast

Ishman

Posted
  • Author
Posted

Thanks for the feedback guys; hadn't logged on since I posted sorry. Sounds like I should just take it a bit easy on the 4th to 5th- it's not like it doesn't go fast enough in 4th. I'll try and get my hands on some of this high quality gear oil in the mean time. Are you saying that even with the right oil and a lack of abuse it may still crunch a little if changed too fast, in which case there may be nothing wrong?

Ten Four Grand Master

Ten Four

Posted
Posted

Thanks for the feedback guys; hadn't logged on since I posted sorry. Sounds like I should just take it a bit easy on the 4th to 5th- it's not like it doesn't go fast enough in 4th. I'll try and get my hands on some of this high quality gear oil in the mean time. Are you saying that even with the right oil and a lack of abuse it may still crunch a little if changed too fast, in which case there may be nothing wrong?

Redline! Do it and report back.

  • 3 weeks later...
Brandon Veteran

Brandon

Posted
Posted

Sorry if I'm hijacking the topic. I experience crunching from 3rd to 4th on high rev (e.g. 7000rpm). It does go in but you can hear the crunching noise. However, this only happens on load and never when I shift below 6000rpm. <BR><BR>Another problem which happened ages ago and only once was grinding noise when engaged in reverse gear after a drag day. A quick summary of what happened that day was 3x 6000-7000rpm launches and grinding starts. Drove the car nicely and after that day, the sound went away. Might be something loose from heat expansion? <BR><BR>I know its a million dollar question but if it was you, would you rebuild the gearbox or would you just try using redline? I am planning to change the clutch if that helps making the decision. Rebuild by my mechanic was quoted around 1.5k - 1.8k (everything included except for buying the clutch)

Ten Four Grand Master

Ten Four

Posted
Posted (edited)

Redline is costing me $120 delivered from Harold @ performance hub.

Give it a go first. If it fails to fix it (I doubt it from what you're describing..), then rebuild/buy another, fill with redline from get go.

With the reverse thing, it could be the clutch cable stretching, making the friction point move to the floor and beyond? This happened with my M3 after a hard day out. New cable, $20 and it was sorted.

Edited by Ten Four
PIG747 Mentor

PIG747

Posted
Posted

I have the same problem but with 3rd sometime's and 4th more often. I tried the redline oil and it still has the problem.

I'm planing on replacing the synchro's so does anybody know of a good place to get these or someone that sells rebuild kits?

smithy85 Community Regular

smithy85

Posted
Posted

Redline is costing me $120 delivered from Harold @ performance hub.

Give it a go first. If it fails to fix it (I doubt it from what you're describing..), then rebuild/buy another, fill with redline from get go.

With the reverse thing, it could be the clutch cable stretching, making the friction point move to the floor and beyond? This happened with my M3 after a hard day out. New cable, $20 and it was sorted.

clutch cable - ummm, no

  • 2 weeks later...
Fantm1 Contributor

Fantm1

Posted
Posted

I had an occasional crunch into 5th even when changing at a casual rate also the odd crunch on fast changes into other gears. I put in Redline Shockproof Light and it pretty much all went away. It crunched once into 5th soon after putting it in but not again for the last 3-4,000kM. Occasionally I feel a slight grab into one of the other gears, but not a crunch. For my g/box and hip pocket Redline Shockproof Light was the answer.

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