R34 Gearbox 5Th Gear Synchro May Need Replacing

[iwanta34gtr]

Hi every1, Ive recently bought a 34 gtt as my daily until i find my gtr.

I have noticed that under any load, 5th gear is starting to get resistance while trying to put it in.

It is okay when driving around town, but when on freeway its obvious. Doesnt happen when shifting down, only up in to 5th.

Had a similar issue with my 350z and had to get the box rebuilt and a new synchro put in to fix it (cost me $1500).

But my 350z would crunch hard, this doesnt. There is a slight noise but still slots in pretty easily.

Im assuming the synchro for 5th is on the way out, any1 have any suggestions where is the best place to take it and a idea on cost? I live in Rouse Hill in Sydney.

Still deciding whether to fix it or just try and live with it until it completely breaks.

Thanx in advance.

[GTRsean]

Change the oil in it first....

Was going to add 'with something decent'

Edited October 8, 2011 by GTRsean

[N1GTR]

Rouse Hill? Call Unigroup Engineering, talk to Yavuz, tell him you need redline shockproof put though your gearbox for you and book it in. Mention that the club sent you and the price will be good.

Problem solved

[iwanta34gtr]

Hello Sean, thanx for the reply. I believe the previous owner already changed the gearbox oil (not sure what was put in though) and problem still remains.

Dont know if its of relevance but car is putting out 250rwkw and has a Exedy heavy duty clutch with plenty of meat on it.

Edited October 8, 2011 by iwanta34gtr

[iwanta34gtr]

Rouse Hill? Call Unigroup Engineering, talk to Yavuz, tell him you need redline shockproof put though your gearbox for you and book it in. Mention that the club sent you and the price will be good.

Problem solved

Thanx for the tip. I will call them on Monday morning.

I was researching the fault and found reference to redline shockproof in this thread - http://www.skylinesa...chros-5th-gear/

I also see the seller of the car made a post in there back in 2008 so looks like this faults been present on the car for a few years.

Are we sure that shockproof will make a difference? All other gears are fine. Its just 5th.

Thank u again i really appreciate ur help.

Edited October 8, 2011 by iwanta34gtr

[BOZ22N]

I haven't stripped a 25 box for a while but I think you can get rev and 5th off without pressing everything out of the centre plate.

From memory the genuine Nissan parts are not cheap it will probably cost between $400-$600 just in syncros, bearings, seals and oil etc. Just to do a quick repair.

Don't take this as gospel but it might be work asking the question if it can be done, good luck.

[iwanta34gtr]

Thanks for the advice. I will try and take it to a few places around the area some time this week for quotes.

[N1GTR]

Thanx for the tip. I will call them on Monday morning.

I was researching the fault and found reference to redline shockproof in this thread - http://www.skylinesa...chros-5th-gear/

I also see the seller of the car made a post in there back in 2008 so looks like this faults been present on the car for a few years.

Are we sure that shockproof will make a difference? All other gears are fine. Its just 5th.

Thank u again i really appreciate ur help.

Its the common fix for crunchy boxes, well not a fix, more of a band aid. It costs a lot less than buying all the parts and fixing the box internals so most owners will put the oil in (nickname is smurf blood due to the colour) and live happily with it

[iwanta34gtr]

Fantastic Steve, thanx again for the info.

I asked the seller and have gone through some service receipts. The box currently has Royal Purple synchromax in it.

Is this good quality? Or is it still worth changing to the shockproof stuff?

[Aggroman]

Royal Purple is good stuff.. its quite pricey too, if you can live with it till your next gearbox oil change do it then otherwise you can spend the $100 and try the smurfs blood to see if it makes it any better..

[iwanta34gtr]

Thank u, I called Uni group today.

Yavuz isnt there for a few days but I spoke with one of the guys and he said he is not sure if the Redline will make a difference. And its $120 per litre and will need approx 2 litres of it + will cost $50 to put it in.

Might just live with it for now, until it gets worse.

[fatz]

just put stock oil in yourself and take it easy jamming into 5th

[iwanta34gtr]

Hello fatz, Thanx for the info.

Looking at the oil thats in it, the receipt says its 2.5 years old now.

And ive noticed that it only happens around 15 mins or more in to driving. When its cold it doesnt seem to do it.

And I have been doing gentle shifts, it still resists very slightly but no massive crunches.

Thinking about giving the shockproof a go because im thinking when oil gets warm, it thins out. Maybe this is why it doesnt happen when its cold?

[zebra]

Oil probably too light for an old box, and once it heats up it looses its viscosity

[iwanta34gtr]

Hi there, Is it weird that it only affects 5th?

Ive seen JustJap have a whole gallon of shockproof for $99. I might just grab some and do it myself.

I'd risk $100 and try it out and maybe get no result - just 2 feed curiousity really. But i cant afford to risk the $300 it would cost to take it 2 a shop to have done.

[BOZ22N]

Hi there, Is it weird that it only affects 5th?

Ive seen JustJap have a whole gallon of shockproof for $99. I might just grab some and do it myself.

I'd risk $100 and try it out and maybe get no result - just 2 feed curiousity really. But i cant afford to risk the $300 it would cost to take it 2 a shop to have done.

No it is very common to have 5th and rev play up first on many boxes as it is the furtest from the centre plate.

There are a few online stores you can get the redline oil from cheap per quart.

[iwanta34gtr]

Hi Ryan, Could you please point me in the direction of these cheaper places? Either on here or via PM pretty please? Thanks so much.

[iwanta34gtr]

Hi, I am going to get some redline shockproof.

Noticed that there are 2 types - lightweight and heavy. Whats the difference?

Which one should I get for my car / problem and how many litres / quartz would I need? Thanx heaps.

Edited October 17, 2011 by iwanta34gtr

[Aggroman]

you want the lightweight.. heavy is for stuff like diffs

r34 gearbox takes from memory somwhere between 2.5-3L's

[iwanta34gtr]

Thanks for the clarification David. I was going to go with the heavy as it states its for problematic gear boxes and mine gives the slight crunch and resistance.

http://www.redlineoil.com/product.aspx?pid=44&pcid=8