Gearbox Recondition

[hetman]

Hey Guys,

I had the gearbox reconditioned in my R33 gtst recently. It used to have problems crunching going into 4th and 5th if you didn't let the revs drop and this was fixed which I'm pretty happy about.

There's still a few things that are bothering me though which didn't really improve:

- Still a bit notchy if you shift quickly. Much better if you give it a half second before pushing through.

- Used to be a bit noisy when idling in neutral. Now it's a lot more noisy (especially noticeable from the outside). The guy that did the recondition claims the gears don't mesh very precisely on these boxes and hence the noise.

- Sometimes won't go into reverse. After you blip the clutch goes in ok.

I have the redline lightweight shockproof oil in it now.

I guess what I'd like to know is whether all these sound normal for this gearbox. Should the recondition have made a bigger difference?

Cheers

[Duncan]

Actually that seems a little odd to me. No the gearbox really shouldn't make any noticable noise especially with new bearings etc in. Maybe talk to another gearbox guy. What did they actually recondition?

also - did they tell you to run redline in it? Its not a great idea especially in a new gearbox. Redline themselves don't recommend it for synchro boxes and most people only use it to mask worn synchros in the first place. Since you have new synchros (i assume) you should just run a normal gearbox oil.

[sloutch]

Hey Guys,

I had the gearbox reconditioned in my R33 gtst recently. It used to have problems crunching going into 4th and 5th if you didn't let the revs drop and this was fixed which I'm pretty happy about.

There's still a few things that are bothering me though which didn't really improve:

- Still a bit notchy if you shift quickly. Much better if you give it a half second before pushing through.

- Used to be a bit noisy when idling in neutral. Now it's a lot more noisy (especially noticeable from the outside). The guy that did the recondition claims the gears don't mesh very precisely on these boxes and hence the noise.

- Sometimes won't go into reverse. After you blip the clutch goes in ok.

I have the redline lightweight shockproof oil in it now.

I guess what I'd like to know is whether all these sound normal for this gearbox. Should the recondition have made a bigger difference?

Cheers

Just out of curiosity, how much did you spend on re-conditioning your box?

[grey pearl]

Hey Guys,

I had the gearbox reconditioned in my R33 gtst recently. It used to have problems crunching going into 4th and 5th if you didn't let the revs drop and this was fixed which I'm pretty happy about.

There's still a few things that are bothering me though which didn't really improve:

- Still a bit notchy if you shift quickly. Much better if you give it a half second before pushing through.

- Used to be a bit noisy when idling in neutral. Now it's a lot more noisy (especially noticeable from the outside). The guy that did the recondition claims the gears don't mesh very precisely on these boxes and hence the noise.

- Sometimes won't go into reverse. After you blip the clutch goes in ok.

I have the redline lightweight shockproof oil in it now.

I guess what I'd like to know is whether all these sound normal for this gearbox. Should the recondition have made a bigger difference?

Cheers

Hi there ,I agree with duncan that a new or re-coed gearbox should not use redline don't worry about what you've already read ,it is too slipperry to allow your synchros and more importantly your synchro hubs to work properly I found that out from an expert gtr gearbox repairer,I would replace it immediately with a good quality oil such as VMX80 to avoid the same problems you re-coed it for re-occurring.

I am re-coeing mine for the same reason and it is a costly exercise so you only want to do it once,ask yourself should you be having synchro problems when they have been re-placed?Also did they replace the thrust bearing in the clutch while the box was out,generally these will make the external noise you describe or you may have a twin plate clutch which are inherrently noisy also but I guess you would have noticed that before the re-co wouldn't you.

Just as a matter of interest what did the job cost you as I'm shopping around at the moment and would like a ball-park figure if you don't mind.Cheers Grey Pearl.

[hetman]

Thanks for the suggestions. The oil making the synchros slip might explain why the gear changes are quite smooth if you give them a little time like I mentioned. I'll have to try another oil.

For those interested the job cost $1500

[mattymagoo22]

they may have re-used your bearings instead of using new items which could explain the noise, $1500 did that include r&r of the box?

The syncros are a little slow on these boxes when shifting easily IMO

Edited April 28, 2008 by mattymagoo22

[hetman]

Yeh, R&R included. Apparently they replaced the bearings but I'll have to look into it further.

[hetman]

Oh one more thing, grey pearl mentioned something about clutch noise. I did also get a Exedy Heavy Duty Organic clutch put in when I had the reco done, but that's not a twin plate so I guess it shouldn't be contributing to the noise?

[Duncan]

no single plate should not rattle - but like he said the thrust bearing is the most common reason for a whiring noise from the gearbox (only when foot is on clutch though)

[hetman]

I guess that's not the problem then. My whirring noise is only there when the clutch is engaged (foot off the pedal). It goes away when I depress the pedal though. (You only really hear it distinctly in neutral though since there's a lot more noise from everything when accelerating).

[Duncan]

that means its more likely to be a worn spigot bush - it lives in the rear of the crank and holds the end of the input shaft

[mattymagoo22]

or any of the gearbox bearings as they're all spinning with the car running in neutral.

[Gtrgodzilla67]

dont use redline in rebiult boxes LOL thats a load of rubbish, we use the blue redline in all our gtr and race boxes we biuld Works much better than standard, what a load of sh#t

[grey pearl]

dont use redline in rebiult boxes LOL thats a load of rubbish, we use the blue redline in all our gtr and race boxes we biuld Works much better than standard, what a load of sh#t

Hi There mate, All comments posted on here are only opinions gathered in real life experiences with our own cars,or collated information gathered on forums in order to learn from others mistakes or successes,and include our opinions based on that info collected and processed,so theres no need in flaming people for putting their views in response to others problems and questions.

Ultimately the person requiring answers will do what they like with the info posted for their benefit and really we giving the answers are only giving them info to process and decide what sounds right for them to do as we have done when we ask questions.

I have given what I believe is good advice on not using smurfs blood in gtr boxes,especially new, recoed,or synchroed,you probably being a racer use some type of after market dog box with or without synchros and that oil probably does the job in that application as I have stated in my other post on this oil,race teams are prepared to pull engines and boxes diffs etc down to repair and modify as regularly as necessary as opposed to street users like myself who have to deal with synchro issues, slower changes and not wanting noisy boxes in order to minimise downtime and save expense,so for me it's horses for courses and of course all of my statements are only my opinion,and these forums do allow for that but are opposed to non constructive flaming and arguing.

I have a peacemaking attitude and only wish to help other people on this forum to enjoy our common interest and learn,therefore I accept your opinion as I hope you will accept mine whether we agree or not, I'm not trying to force my point of view on anyone only air it for others to consider,fair enough.Grey Pearl.