how much to replace the broken 4th / 5th syncros in crunching box - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

gtr mart · 14th July 2006, 11:22 AM

as ther title really. considering changing the box my car crunches a little in 5th and sometimes in 4th

As apposed to changing the box, is it cheaper / more efficient to replace the syncros and is this a bitch of a job for a very experianced mechanic?

Its an R32 GTR BTW (1992)

cheers
mart

lightspeed · 14th July 2006, 11:25 AM

Unless it's been done before you'll need at least a grand's worth of parts to upgrade to the R33 style synchros. R32 synchros no longer available AFAIK.

tweenierob · 14th July 2006, 07:08 PM

Agree with the above, not a cheap job on an early box.

Rob

Mookistar · 14th July 2006, 07:15 PM

have you changed the gearoil? Something like redline shockproof can hide all but the worst crunches

mook

tweenierob · 14th July 2006, 07:16 PM

HIDE! tut tut tut

Rob

skyline69_uk · 14th July 2006, 07:26 PM

I can say that Redline Shockproof did the job for me

- hide is not the right term as it just stopped the odd crunch into 5th - hide is when you just turn the stereo up and pretend it isn't happening lol.

tweenierob · 14th July 2006, 07:37 PM

LMFAO!!!!! that is my best mates favourite saying...

I say 'whats that squeak?

'Just turn the stereo up

Rob

LAURENCE · 14th July 2006, 08:36 PM

" ...that's modified car noise "

lol

gtr mart · 15th July 2006, 10:26 AM

I put silktran oil in on a recomendation. Was this stuff never going to quieten a crunch like the red line could have?

Im thinking I might just buy a second hand crunch free box and have that fitted - will an r33 gbox go on? I assume not as my clutch was the earlier type (push I think)

tweenierob · 15th July 2006, 04:22 PM

33 box is quite easy to convert to push clutch.

Gear oil can only disguise the crunching, it isnt a synchro fix

Rob

gtr mart · 15th July 2006, 05:04 PM

thats what I figured so i put in the good quality silktran stuff.

So thinking about it, the best thing for me to do would be to source a 33 box, get a conversion kit to push type and 'slap' that on.

thanks for the info chaps

plkettle · 16th July 2006, 10:41 AM

Put redline shockproof heavy in and the crunching will dissapear, i have spoken to many people who have done this and their boxes have lasted for over a year with no probs since !!! Definatly will help if your not running big power (anything over 600hp)

I have done this to mine (it crunched almost every time before) and now I get no crunches at all and still perfectly ok after 4 months.... and im running 578bhp and driving it hard a lot of the time.

fix it when it breaks mate !

gtr mart · 16th July 2006, 11:53 AM

The box hasx crunched for 2 years and not got worse so Im not convinced it will be break anyway.

I want to flog the motor and am thinking I could fix it for completeness. Banging redline in is more of a cover up than a fix isnt it?

However, since it hasnt got anyworse maybe its just a case of improving the driving experiance than covering up a fault. Crunching syncros are common on these cars afterall.

What do you chaps think? As it hasnt got any worse would doing the redline treatment be a cover up or not?

The Admiral · 17th July 2006, 07:36 PM

Using Redline or similar is just helping what's left of the synchros do their job IMO...

Putting sawdust in is a cover up; using decent oil in a poorly designed gearbox is making it work

If you replaced all your synchros, you'd be back to crunching within a couple of years anyway, I'd guess...

Rog

Big Sev · 17th July 2006, 09:21 PM

A mate at mork told me to put tractor gear fluid in my gear box!

"that's stuffs like treacle" he said,

Mind you he also told me to put a tractor clutch on my car as well.... Ahh the joys of living in the west country

But yeah, as everyone else has said... your looking at around a grand mate, my gear box does the same....

Just learn to double de-clutch i have, saves you money and your mates will think your a right pro!

Sev

14th July 2006, 11:22 AM	#1 (permalink)
gtr mart GTR Register Member Join Date: Mar 2004 Posts: 1,637	how much to replace the broken 4th / 5th syncros in crunching box as ther title really. considering changing the box my car crunches a little in 5th and sometimes in 4th As apposed to changing the box, is it cheaper / more efficient to replace the syncros and is this a bitch of a job for a very experianced mechanic? Its an R32 GTR BTW (1992) cheers mart

14th July 2006, 07:08 PM	#3 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,838	Agree with the above, not a cheap job on an early box. Rob __________________ 599hp R35 Gtr www.trracing.co.uk T62 Going back on for track WTF!! :D Addicted to Snett!! Roll on the 24th of jan £99 rocks!

14th July 2006, 07:15 PM	#4 (permalink)
Mookistar ADMINISTRATOR Join Date: Feb 2004 Location: Living life 8min 50 secs at a time Posts: 10,409	have you changed the gearoil? Something like redline shockproof can hide all but the worst crunches mook __________________ FOR ALL GTR FORUM RELATED ISSUES CONTACT THE ADMIN TEAM 'MOOKISTAR' OR 'MOLEMAN' SKYLINE FAQ'S!

14th July 2006, 07:16 PM	#5 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,838	HIDE! tut tut tut Rob __________________ 599hp R35 Gtr www.trracing.co.uk T62 Going back on for track WTF!! :D Addicted to Snett!! Roll on the 24th of jan £99 rocks!

14th July 2006, 07:26 PM	#6 (permalink)
skyline69_uk GTROC Member Join Date: Jan 2005 Location: NI Posts: 2,833	I can say that Redline Shockproof did the job for me - hide is not the right term as it just stopped the odd crunch into 5th - hide is when you just turn the stereo up and pretend it isn't happening lol. __________________ Do it right or don't do it at all. "You're a pack of a**holes!" - Jim Richards 1992. スカイライン６９　UK

14th July 2006, 11:25 AM	#2 (permalink)
lightspeed GTROC Member Join Date: Jul 2002 Location: South-west Posts: 1,812	Unless it's been done before you'll need at least a grand's worth of parts to upgrade to the R33 style synchros. R32 synchros no longer available AFAIK.

14th July 2006, 07:37 PM	#7 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,838	LMFAO!!!!! that is my best mates favourite saying... I say 'whats that squeak? 'Just turn the stereo up Rob __________________ 599hp R35 Gtr www.trracing.co.uk T62 Going back on for track WTF!! :D Addicted to Snett!! Roll on the 24th of jan £99 rocks!

14th July 2006, 08:36 PM	#8 (permalink)
LAURENCE GTR Register Member Join Date: Jan 2005 Location: RC Developments, Chester/Warrington Posts: 527	" ...that's modified car noise " lol

15th July 2006, 10:26 AM	#9 (permalink)
gtr mart GTR Register Member Join Date: Mar 2004 Posts: 1,637	I put silktran oil in on a recomendation. Was this stuff never going to quieten a crunch like the red line could have? Im thinking I might just buy a second hand crunch free box and have that fitted - will an r33 gbox go on? I assume not as my clutch was the earlier type (push I think)

15th July 2006, 04:22 PM	#10 (permalink)
tweenierob GTROC Member Join Date: Aug 2003 Location: herts Posts: 1,838	33 box is quite easy to convert to push clutch. Gear oil can only disguise the crunching, it isnt a synchro fix Rob __________________ 599hp R35 Gtr www.trracing.co.uk T62 Going back on for track WTF!! :D Addicted to Snett!! Roll on the 24th of jan £99 rocks!

15th July 2006, 05:04 PM	#11 (permalink)
gtr mart GTR Register Member Join Date: Mar 2004 Posts: 1,637	thats what I figured so i put in the good quality silktran stuff. So thinking about it, the best thing for me to do would be to source a 33 box, get a conversion kit to push type and 'slap' that on. thanks for the info chaps

16th July 2006, 10:41 AM	#12 (permalink)
plkettle New Users Join Date: Feb 2004 Location: york Posts: 1,203	Put redline shockproof heavy in and the crunching will dissapear, i have spoken to many people who have done this and their boxes have lasted for over a year with no probs since !!! Definatly will help if your not running big power (anything over 600hp) I have done this to mine (it crunched almost every time before) and now I get no crunches at all and still perfectly ok after 4 months.... and im running 578bhp and driving it hard a lot of the time. fix it when it breaks mate !

16th July 2006, 11:53 AM	#13 (permalink)
gtr mart GTR Register Member Join Date: Mar 2004 Posts: 1,637	The box hasx crunched for 2 years and not got worse so Im not convinced it will be break anyway. I want to flog the motor and am thinking I could fix it for completeness. Banging redline in is more of a cover up than a fix isnt it? However, since it hasnt got anyworse maybe its just a case of improving the driving experiance than covering up a fault. Crunching syncros are common on these cars afterall. What do you chaps think? As it hasnt got any worse would doing the redline treatment be a cover up or not?

17th July 2006, 07:36 PM	#14 (permalink)
The Admiral GTR Register Member Join Date: Jul 2004 Location: Scotland Posts: 614	Using Redline or similar is just helping what's left of the synchros do their job IMO... Putting sawdust in is a cover up; using decent oil in a poorly designed gearbox is making it work If you replaced all your synchros, you'd be back to crunching within a couple of years anyway, I'd guess... Rog

17th July 2006, 09:21 PM	#15 (permalink)
Big Sev GTR Register Member Join Date: May 2005 Location: Cambridge/London Posts: 552	A mate at mork told me to put tractor gear fluid in my gear box! "that's stuffs like treacle" he said, Mind you he also told me to put a tractor clutch on my car as well.... Ahh the joys of living in the west country But yeah, as everyone else has said... your looking at around a grand mate, my gear box does the same.... Just learn to double de-clutch i have, saves you money and your mates will think your a right pro! Sev

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