Noisy Reverse gear

[JET-28L]

i have the same problem with my vr6 not much u can do besides drive it very carefully in reverse till u rebuild the box since its a straight cut gear should be fine as long as u don't put strain on it

[chris.]

MUCH MUUUCCCCHHH Stronger.

You can get a Straight cut box with Synchro's too so you don't have to rev match at all. In our WRX we have done 1st to 4th so for highway driving, you can go to 5th and have the quietness of the Helical cut.

just to let you now helicel gear are acctully stronger as there is more tooth because of the angle
straight cut are just better to ingauge (ie. change gear quicker)

rex boxs just break due to people smashing them it to gears
so when they get the straight cut it allows them to change quick with out as much risk of it breaking

[craig_the_german]

Hi all,
went to change the g/box oil to see if it made any difference to the noisey/knocking reversed gear...found I couldn't undo the drain or refill plugs...needed a 17mm male socket...not something I had in the tool box.

have got one now from Repco, cost $18.50 but can now do the job this arvo.

[TassieGTi]

If its knocking in reverse there is damage to the teeth.This will eventually result in failure.020 boxes from the mk3 on had a very weak reverse gear set and its a common problem unfortunately.

[craig_the_german]

Hi all,
Well changed the oil in the g/box last night.
Gearbox is now smoother than ever before, the shifts are slicker than ever before but the reverse is still the same.

I can assume that from previous posts, this noise is common to the 020 g/boxes.

What is the solution, wait until it goes bang and then rebuild or is there a common fix that could prolong the life of the g/box?

It has made this noise for at least the last 35000km and possibly before (previous owner) but has gotten louder recently.

Can I still just drive is gently in reverse and get a reasonable life out of it or is it likely to go bang in the short term?

What is everyones experience on this?

Should it go bang or I decide to rebuild prior, who is recommended in brisbane?

Thanks and sorry for all the questions?

[torque]

Hi all,
Well changed the oil in the g/box last night.
Gearbox is now smoother than ever before, the shifts are slicker than ever before but the reverse is still the same.

I can assume that from previous posts, this noise is common to the 020 g/boxes.

What is the solution, wait until it goes bang and then rebuild or is there a common fix that could prolong the life of the g/box?

It has made this noise for at least the last 35000km and possibly before (previous owner) but has gotten louder recently.

Can I still just drive is gently in reverse and get a reasonable life out of it or is it likely to go bang in the short term?

What is everyones experience on this?

Should it go bang or I decide to rebuild prior, who is recommended in brisbane?

Thanks and sorry for all the questions?

Does it do like a bank noise when you put it in reverse or it is just whinning noise as you reverse ?

If the former, don't worry. I made mine much quieter with Redline MTL gearbox oil, that is the best there is.

If the first, let it go bang and then rebuild.

[Golf Loon]

If its just clicking, just be gentle going backwards and it will be sweet.

I have experience of 020 gearboxes rebuilding and the reverse gears are weak, especially in those Mk3 and 1.6 Mk4 boxes.

Its actually the same gear used in the Mk1 4 speed boxes and these never wear out, different steel, or less gears in the gate? I dont know.

I have known em last ages with noisy reverses and it probably wont hurt the rest of the box when the teeth sheer of the reverse gear. I`d wait for other symptoms before getting it rebuilt.

[craig_the_german]

Thanks everyone for the advice.
I'll just take it very easy in reverse as the rest of the box seems perfect.
I will get it repaired but I can wait a while and just put up with the noise
It is probably more embarassing than anything....select reverse at the shopping centre, slip the clutch...knock, knock, knock....

[Jmac]

Only thing with the reverse in an 020 i have seen the gears chip , like Loon says they are weak. Chipped gears not so flash as it can go through the rest of the box. Nice to see someone using Redline MTL. I cant recommend it enough.
Jmac

[craig_the_german]

Well I finally decided that the noise in reverse was getting worse and I should do something about it before it went bang completely.

My pride and joy is sitting on a hoist as we speak with the remains of the gearbox all over the bench at Gabba Gearboxes.

After he quoted me the repair costs he suggested that I should come around and have a look for myself.

The verdict......

1. The reverse idler gear had lost a tooth and all of the remaining teeth on the idler had been chipped on the corners. Fortunately the largest chunks of tooth managed to get caught by the internal magnet inside the gearbox but the little pieces, filings etc made their way through every bearing in the box...full set of bearings.

2. The worn/bent/broken teeth on the reverse idler had damaged the larger gear that it meshes with....New gear required.

3. As the reverse idler gear meshes with a gear which is actually part of the input shaft into the gearbox, the worn/bent/broken teeth had damaged the gear on the input shaft....new input shaft.

4. While the gearbox was out, I asked the guys to have a look at the clutch...might as well......clutch linings almost down to the rivets...new clutch, pressure plate and flywheel machine ......bugger!

The cost for this little adventure...$3750

OUCH!!!!!!