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Rb25det Gearbox Crunching Into 4th Gear

Guilt-Toy
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Guilt-Toy Grand Master

Guilt-Toy

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I got 2 gearbox's that crunch into 4th gear. There is a syncro clip that comes out when you shift into 4th too quick.

does anyone know the part number for this or know where I can buy some? i need about 5 of them.

cheers

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Guilt-Toy Grand Master

Guilt-Toy

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no its a syncro clip that brakes and falls into the oil. when you change the oil you can see it on the magnet.

this is a known issue with 25 box's. so where can i get the parts to replace mine?

woolls Experienced

woolls

Posted
Posted

p/n fast comes up with is, 32609-70L70. there is 3 of them.

i was having the same plobem with 3rd and 4th crunching, My 3rd syncro ring was worn and my 4th was cracked.

I got 2 gearbox's that crunch into 4th gear. There is a syncro clip that comes out when you shift into 4th too quick.

does anyone know the part number for this or know where I can buy some? i need about 5 of them.

cheers

Guilt-Toy Grand Master

Guilt-Toy

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p/n fast comes up with is, 32609-70L70. there is 3 of them.

i was having the same plobem with 3rd and 4th crunching, My 3rd syncro ring was worn and my 4th was cracked.

do you have a picture of these clips? what do they look like ?

what came out of my gearbox does not look like a ring

Guilt-Toy Grand Master

Guilt-Toy

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thanks for your help man, but thiis looks different to what came out of my gearbox.

here are the pics

post-1240-1254908068_thumb.jpgpost-1240-1254908107_thumb.jpg post-1240-1254908170_thumb.jpg

in one of my other box's that this happened to only the small clip part came off and it crunch's into 4th gear. it does not crunch every time. about 60% of the time.

any ideas?

just went and took a pic.
Guilt-Toy Grand Master

Guilt-Toy

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Guilt - those clips look the same as in my R32 gtr box that i have the bell housing off at the moment.

what are they ? whats the part number? what do they do? how do you replace them?

GTR1993 Mentor

GTR1993

Posted
Posted

they are on the 4th gear syncro, i dont know what they do but i can ask someone who will know. Only reason i know is i was having issue selecting 4th when i took my housing off and was looking at them when I was trying to figure out what was wrong.

woolls Experienced

woolls

Posted
Posted

Can't find them in fast, but I think there is 3 of them. I think they are on the 5th gear synchro hub. i will look at mine tomorrow.

The only things on the 3rd and 4th synchro hub are the 3 shift inserts, and 2 insert springs.

thanks for your help man, but thiis looks different to what came out of my gearbox.

here are the pics

post-1240-1254908068_thumb.jpgpost-1240-1254908107_thumb.jpg post-1240-1254908170_thumb.jpg

in one of my other box's that this happened to only the small clip part came off and it crunch's into 4th gear. it does not crunch every time. about 60% of the time.

any ideas?

Guilt-Toy Grand Master

Guilt-Toy

Posted
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they are on the 4th gear syncro, i dont know what they do but i can ask someone who will know. Only reason i know is i was having issue selecting 4th when i took my housing off and was looking at them when I was trying to figure out what was wrong.

Yeah they are the reason why this is happening. they hold the syncro in place or something? I am not sure. But i know there is one guy in sydney who knows the issue and he repaires them for $250. but i am in Eastern europe now i cant exactly chuck 2 box's in the back of my car and cruise down to him.. i mean the skyline can fly but not that far :dry:

Can't find them in fast, but I think there is 3 of them. I think they are on the 5th gear synchro hub. i will look at mine tomorrow.

The only things on the 3rd and 4th synchro hub are the 3 shift inserts, and 2 insert springs.

That would be good. please help. I have 3 gearbox's here that need this repair done on them and we cannot exactly take it to a local guy to find the issue and parts and sort it out. we can take him the box with the parts we need installed but thats about it.

my 33 gtr box crunches 4th too, every other gear is very smooth tho, i wish wat u are suggesting here is true coz id do it straight away! just need to know how to do it lol

Yes its true, its from shifting from 3rd to 4th gear too fast. it has happened to a few of my box's and a few others that i know of.

We need to get to the bottom of this!!!

dori34 Grand Master

dori34

Posted
Posted
Yes its true, its from shifting from 3rd to 4th gear too fast. it has happened to a few of my box's and a few others that i know of

that happens to me as well GT, i always thought it was either shi*t gb oil or worn synchro.

i will keep an eye on this thread incase you find the answer cause it worries me that my gb might blow 4th gear lol.

Guilt-Toy Grand Master

Guilt-Toy

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that happens to me as well GT, i always thought it was either shi*t gb oil or worn synchro.

i will keep an eye on this thread incase you find the answer cause it worries me that my gb might blow 4th gear lol.

nah the box won't break the gear. eventually you will wear out the syncro and it will get worse so that means if you fix the clip issue it will still crunch because the syncro will be worn out.

We need answers! someone help us with the info we need. I am sure this is a quick and easy fix and once we get part numbers I will get pics and give all the info i can when i repair the box's here.

Guilt-Toy Grand Master

Guilt-Toy

Posted
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Posted

Here is a message i got from PJ a while back about fixing this issue.

I removed his number from the PM, I am sure he wont appreciate his number being put on a public forum.

I did talk to George and he is able to fix the box's for around $300 i believe. If someone is keen to get there's done and need his number then please send me a PM, maybe if you go to him with a box that needs the repair and ask him for the details and part number to get the parts to do the job he may help us out?

Sadly I am not in a situation on the other side of the globe to do that.

anyone keen?

------

Give George from Advanced Motor Mechanics in Enfield a call 0402 *** ****

They do all the mechanical work on my beast.

If your 4th gear syncro is hammered, replacing the clips won't stop the crunching though...

Cheers

Paul

------

woolls Experienced

woolls

Posted
Posted (edited)

I had a look at mine today, those clips that you put a pic up of, are only on my 5th gear synchro hub. My 1st -2nd and 3rd-4th synchro hubs only have the shift inserts. (the ones in the pic I put up )

my gearbox is a 5/98 model which is a bit different than the early models and maybe this is one of the different things.

Edited by woolls
Guilt-Toy Grand Master

Guilt-Toy

Posted
  • Author
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is it possible that those clips hold all the syncro's together and causes the 4th gear crunching?

I had a look at mine today, those clips that you put a pic up of, are only on my 5th gear synchro hub. My 1st -2nd and 3rd-4th synchro hubs only have the shift inserts. (the ones in the pic I put up )

my gearbox is a 5/98 model which is a bit different than the early models and maybe this is one of the different things.

turboedsloth Grand Master

turboedsloth

Posted
Posted

those clips are from the sliding hub that selects gears. 3rd and 4th are f**ked. box has to come out, remove the bell housing, remove the input shaft from the mainshaft and you will find that the sliding hub outside part will just fall off

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