weeebell

iTrader: (1)

Hello all,

When driving the car about town its fine, but when driving hard and changing from 4th to 5th, it crunches. Is it just the nut thats slack?

Also, AndyF has just remapped the car to 320bhp on an MY99 so I know my standard box and clutch wont last for any length of time.

Its my daily driver, I dont do track days but I do drive it hard quite a lot so should I be looking to rebuild my own gerbox with stronger 3rd, 4th and 5th gears or would a bugeye 'box do the trick.

I'll probably be going for bigger injectors, another turbo (vf28 at the mo) and another remap in the future is this helps.

Many thanks. Every reply helps.

JohnD

iTrader: (5)

Do you know what oil is actually in the gearbox? I had the same problem with my 99MY when I put full synthetic fluid in the box (as did a number of people on here) Reverted to Castrol Syntrax (Driveline) - problem cured! I'm not saying that this is the cure in your case, but it's worth investigating.
JohnD

RON

Weebel

there's a strong possibility that the nut that holds fifth on, could be loose, or, the synchro is wearing..... ir it's either of those, it can be sorted in the car..... API or other specialists should be able to assess and cure it!!

silent running

5th gear crunch just started on mine. Had my 752 box rebuilt by API sometime in the last year and fitted their lightened flywheel and Exedy clutch at the same time.

I get a light crunch from 4th into 5th, although strangely not coming back down again into 4th. I thought it might be the synchromesh and leaving it momentarily in neutral before going through into 5th does seem to cure it.

My question is, what are the possibilities: a knackered synchro, some kind of 5th gear nut, anything else? And secondly, is it something I can just drive through and live with or something that is gonna end up with a big repair bill? There's no way I want to pay for removing two gearboxes in a year. Running around 1.45 bar boost with a TD05-16G.

silent running

Anyone?

toby79

Hello there I have the same problem on my 97 WRX Wagon it crunches in 5th and if I pull the lever over to the right and put it in it doesnt crunch so much. I have read that there is a 5th gear nut that can need tightening and can be done with the gearbox in the car any info on this would be great as how easy is it to tighten up the 5th gear nut does the oil need to be drained from gearbox??

IMPREZASTU

Hi guys, im new to scooby net but ive been a mechanic for a while now so i will try to help people when i can. It sounds like you might have a worn 5th Gear synchro. They usualy only crunch going up through the gears but when they get very worn they start to crunch on there way down too. Hope this helps.