Jump to content
SAU Community

4th Gear Crunch

RB25PWR
 Share

Recommended Posts

RB25PWR Proficient

RB25PWR

Posted
Posted (edited)

My gearbox seems really 'notchy' and especially when I shift to 4th it always crunches when I'm going fast. If I just put around it's fine but if I go from 80km - 100-110 in 3rd into forth it'll crunch. Even sometimes at lower speeds. The same happens if I'm downshifting to 4th at those speeds also, so I find myself going from 3rd to 5th which I hate.

What does this mean? The gearbox is on the way out? I have no idea.

edit: it's an r33gst-t s2 std box and clutch afaik.

Edited by RB25PWR
Link to comment
https://www.sau.com.au/forums/topic/327140-4th-gear-crunch/
Share on other sites
dazmo Proficient

dazmo

Posted
Posted

The problem will be worn sinchro's more than likley not the actual synchro itself but the face of the shoulder that the sinchro seats on. It is common for the face to glaze up wich can be a reasonably simple fix as quite often the face can just be lapped with some lapping paste (the same as you would lap in valves in a cylinder head) and the problem will be fixed any decent gearbox shop should be able to do this for around the $600-800 dollar range.

Link to comment
https://www.sau.com.au/forums/topic/327140-4th-gear-crunch/#findComment-5323703
Share on other sites
GTScotT Grand Master

GTScotT

Posted
Posted

4th gear is a common issue, there is a set of clips under the gear that snap and cause crunching there after.

Either way the gearbox will need to be rebuild by someone who really knows what their doing.

GL

Link to comment
https://www.sau.com.au/forums/topic/327140-4th-gear-crunch/#findComment-5323763
Share on other sites
Spurdo Experienced

Spurdo

Posted
Posted

yea when this happens the beginning of the end is nigh for your gearbox, if u dont wanna fork out for a recondition straight away then at the very least change the oil to redline shockproof gear oil clicky. a lot of people are finding this stops the crunching. but wont do so forever as wear on your gearbox progresses

Link to comment
https://www.sau.com.au/forums/topic/327140-4th-gear-crunch/#findComment-5323988
Share on other sites
  • 2 weeks later...
ClutchBurndout-:( Grand Master

ClutchBurndout-:(

Posted
Posted
DONT YOU PEOPLE SEARCH!

All answered here.

http://www.skylinesaustralia.com/forums/Rb...ng-t290880.html

i would say its the synchro though, all gearboxes are the same, if it can change at lower rpm without crunching, and at high rpm it crunches, then tis the synchro and not the clips

Link to comment
https://www.sau.com.au/forums/topic/327140-4th-gear-crunch/#findComment-5349174
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      MLR's Bogan cruise ship

      By The Bogan · Posted

      Always have 😁
    • luke gtr
      So i brought a boat...

      By luke gtr · Posted

      Jump into the wasteland. Plenty of random posting/chatting going on in there.
    • OST Micah
      RH9 R32 GTR Build Thread

      By OST Micah · Posted

      I did not go to GTR Festival. It's quite a long drive and the car wasn't dialed in yet. I also wanted to see how the racing portion went before going. From what I can tell the classes were not heads up, index, or bracket - just whoever has the quickest ET wins. Never heard of that sort of thing before and maybe some people like it but it's not my cup of tea. I don't suspect I'll go if that is how the racing is done. I did get the car out three times and had issues each time. Some were my error - haven't raced the car in over two years - and others were parts. Had trouble getting the clutch to slip correctly and remembering how it was set up in the Haltech. Broke some drivetrain parts as well that couldn't be fixed in a couple days to get back out. Season definitely didn't end the way I wanted but at least the bearings are still fine! Not a fleck of material in the filter. Really hoping next year is the year I can actually test this car properly. 
    • MBS206
      HY51 Fuga Hybrid

      By MBS206 · Posted

      find it funny everyone claims different fuel chains, do different things with their fuel blah blah blah. We don't have that many fuel terminals in Australia. The fuel tanker trucks drive into the terminal, fill up, and drive directly to the service station and dump out. The majority of fuel you get, is coming out of the same terminals. The variation is actually at the individual service stations and how good their tanks are, as well as how much turn over they actually have. Older fuel stations, that haven't had their tanks replaced are going to end up with the worst fuel. Also a lot of older stations have shit design, and shit maintenance, and end up with more water absorption into the tank. This is when you then get a bad batch of fuel. Other shit things happen, like tanker drivers have a f**k up, and starting to unload the wrong compartment on their truck into the wrong tank. 
    • r32-25t
      MLR's Bogan cruise ship

      By r32-25t · Posted

      Yeah go with that one 
×
×
  • Create New...