505 GTI diff noice at 120km/h?
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Thread: 505 GTI diff noice at 120km/h?

  1. #1
    1000+ Posts parry's Avatar
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    Default 505 GTI diff noise at 120km/h?

    Took the 505 for a drive this morning on some nice country roads, all seems good with the car except once I got on the freeway there was a noise at 120km/h coming from the drive train. It did seem like it was the diff but not 100%. The noise goes away if you go off load or take the car out of gear at that speed.

    Soon, I will be taking the car on a 8,000km outback journey so want to have this looked at, any suggestions where to start?

    Car is a 1985 GTi 5 speed. 392,000 kms on the clock

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  2. #2
    Demannu-facturing! Demannu's Avatar
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    My bet would be on the fifth gear bearing in the back of the gearbox. See if it does the same in fourth.

    But nonetheless, check the diff fluid anyway...
    Scotty

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    Banana skins.

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    1000+ Posts parry's Avatar
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    Quote Originally Posted by Demannu View Post
    My bet would be on the fifth gear bearing in the back of the gearbox. See if it does the same in fourth.

    But nonetheless, check the diff fluid anyway...
    If I stay away from the Noise zone will it last the trip, lots of 5th gear driving!
    90 205 Gti Cherry Red(Track Car)
    2009 207gti
    1985 505gti (Shitbox Rally) Sold

    PBs:

    Oran Park: 1:27:9
    Wakefield: 1:05.6 (July 2015)
    Eastern Creek: 1:47 (16V) 2019
    Mt Huntley: 34.44 (2004 stock 205)
    Ringwood: 35.06 (30/10/2005)
    Winton: 1:33.6 (2017)

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    1000+ Posts BIGRR's Avatar
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    When/if 5th craps itself, you can use 4th it's 1:1 and is within 5% of the same overall ratio as 4th (Top) in a 504!

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    Renault 72' 16TS from new
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    1000+ Posts parry's Avatar
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    Quote Originally Posted by Demannu View Post
    My bet would be on the fifth gear bearing in the back of the gearbox. See if it does the same in fourth.

    But nonetheless, check the diff fluid anyway...
    Does it in 4th as well...So I am thinking diff or driveshaft center bearing,,,Maybe needs greesing
    90 205 Gti Cherry Red(Track Car)
    2009 207gti
    1985 505gti (Shitbox Rally) Sold

    PBs:

    Oran Park: 1:27:9
    Wakefield: 1:05.6 (July 2015)
    Eastern Creek: 1:47 (16V) 2019
    Mt Huntley: 34.44 (2004 stock 205)
    Ringwood: 35.06 (30/10/2005)
    Winton: 1:33.6 (2017)

  7. #7
    Fellow Frogger!
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    Could also be the splines on the driveshaft


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    1000+ Posts Beano's Avatar
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    You could always jack it up, put chocks under the wheels, handbrake on and get underneath while it's in gear. Only one rear wheel will be turning. Use a piece of wooden dowel as a stethoscope.

    I did this once and was amazed at how noisy gearboxes are.

    You want to eliminate the gearbox and diff being the problem before you start thinking it's the centre bearing. Having said that, I think my own centre bearing is stuffed, though I haven't eliminated the diff 100%.

    People in garages don't realize the grease nipple even exists halfway down the prop shaft and it doesn't get greased.
    How long have you had it, and who did the previous owner take it to for servicing ? Specialists, or the local garage ?

  9. #9
    Fellow Frogger!
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    When I first got my 505 there wasn't positive evidence of recent greasing on either centre bearing or steering rack so I've done those twice in the space of 5K kM. Changed oil in gearbox & diff too. I have noticed a momentary grating noise coming from back end when turning sharp left, I'm assuming it's the sticky-diff protesting the new oil.


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    Quote Originally Posted by Beano View Post
    You could always jack it up, put chocks under the wheels, handbrake on and get underneath while it's in gear. Only one rear wheel will be turning. Use a piece of wooden dowel as a stethoscope.

    ...

    Does the hand brake on 505s operate on the front wheels? Sounds unlikely...

  11. #11
    1000+ Posts Beano's Avatar
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    Oops.

    Erm...anyway, you'll be amazed at how noisy diffs and gearboxes are. But listen through the stethoscope for the same tone you heard.

    Very unlikely to be the centre bearing. They just it there, with no real pressure on them.

  12. #12
    1000+ Posts Peter C's Avatar
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    Beano is right. Manual 504 gearboxes in good condition sound really noisy if you drive the car around the block with the centre console and metal gear lever cover removed.

  13. #13
    1000+ Posts driven's Avatar
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    When the noise stops the car will also stop.... EASY

  14. #14
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    Put the appropriate Nulon in both the gearbox and the diff as well as grease the centre bearing.

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    Quote Originally Posted by neil s View Post
    Put the appropriate Nulon in both the gearbox and the diff as well as grease the centre bearing.
    Not convinced by the 'Nulon' snake oil, but I did add 5% 'Moly Tech' additive @my gbox oil change. Yep I know it's for 'engines' but you're using engine oil :-)


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    1988 Mercedes 300E
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  16. #16
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    Quote Originally Posted by Peter Chisholm View Post
    Beano is right. Manual 504 gearboxes in good condition sound really noisy if you drive the car around the block with the centre console and metal gear lever cover removed.
    Not just noisy. In my old 504, with all the clattering and crunching, you'd swear the gearbox was going to disintegrate in the not too distant future !

  17. #17
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    Quote Originally Posted by Beano View Post
    Not just noisy. In my old 504, with all the clattering and crunching, you'd swear the gearbox was going to disintegrate in the not too distant future !
    Yes, that's exactly what it is like and it's a real revelation to hear it without the cover etc. I can only imagine what a faulty gearbox sounds like. When you realise just how noisy these things are you wonder how they last.

  18. #18
    1000+ Posts Beano's Avatar
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    Quote Originally Posted by Peter Chisholm View Post
    When you realise just how noisy these things are you wonder how they last.

    Like certain posters here and on other forums like Facebook, eh ?

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    A mechanic friend of mine was telling me yesterday of a light truck gear box he had worked on [ twas noisy],upon removing the top plate that housed the shift leaver ,he found the box to be full of meat ,didnt smell very pleasant ,he recons its an old trick ,first time i have heard of it

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    Quote Originally Posted by pugwash View Post
    A mechanic friend of mine was telling me yesterday of a light truck gear box he had worked on [ twas noisy],upon removing the top plate that housed the shift leaver ,he found the box to be full of meat ,didnt smell very pleasant ,he recons its an old trick ,first time i have heard of it
    Must've belonged to a butcher.

  21. #21
    1000+ Posts Wildebeest's Avatar
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    Back in the day. Volvo trucked down from Geraldton to Perth. Workshop order says "overhaul diff." Duly done with new bearings etc. Nothing evidently wrong with the old.
    Road test on completion, howling noise increases with speed. I was driving with service manager and Volvo state engineer as observers.
    Short story longer. Wind noise through tubular roof rack.

    I thought you would ask. Difficult to initially road test with diff boxed up in boot!

  22. #22
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    Quote Originally Posted by neil s View Post
    Put the appropriate Nulon in both the gearbox and the diff as well as grease the centre bearing.
    Contrary to others opinions, replacing the oil in my BA 7-5 with Nulon oil made a a considerable difference to smoothness of gear shift and noise. The oil was on special at the supplier and this was first experience of Nulon oil.

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    I also recommend nulon was wondering if that truck had a wagyu shift kit ,whilst driving i was wondering how one would ,put the meat in there ,stir fry through the filler hole a strip at a time ,possibly .pugs

  24. #24
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    Quote Originally Posted by pugwash View Post
    I also recommend nulon was wondering if that truck had a wagyu shift kit ,whilst driving i was wondering how one would ,put the meat in there ,stir fry through the filler hole a strip at a time ,possibly .pugs
    There are likely forums to visit that give advice on placing large amounts of meat in small orifices.

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