Gearbox on the way out!!
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  1. #1
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    Default Gearbox on the way out!!

    I think the gearbox in my 405 SRDT is on the way out. Changing the gear into 3rd and 4th is very inconsistent, sometimes not wanting to go into gear and then whining while in gear and other times going in smoothly and running silently. Also on the expressway I had to hold it into 5th gear to stop it jumping out. Can anyone please tell me it is a simple fix because I had planned to do an engine conversion on another car during the next 2 weeks I have off.

    Realistically what is the best possible outcome?

    I suppose the worst is to pull out the engine & g/box and get it rebuilt then put it all back in again. Maybe this time with Garret GT17 Turbo and a front mounted intercooler from a Volvo.

    All in all i suppose I am going to have many 'character building' surprises.

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  2. #2
    Member franco's Avatar
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    If the clutch is adjusted properly, then the only solution from the sounds of your problem is to get the synchros replaced in the box

    Not cheap, but maybe a good second-hand box will get you out of trouble?
    1991 Peugeot 405 Mi16 sports saloon
    Boge shock absorbers all round
    K&N panel
    FOR SALE: $4800 NEGOTIABLE
    http://www.aussiefrogs.com/forum/showthread.php?t=32141

  3. #3
    Moderator Alan S's Avatar
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    Might sound a silly question, but have you checked the level of the gearbox oil?
    My 16V when I bought it was a bit iffy and noisy and when I did my usual fluid changes on any car I buy, I discovered that engine and gear oil combined made up less than 2 1/2 litres.
    Seeing as the gearbox takes 2 litres and the crankcase 5 that's a bit of a worry. The gearbox had around 300 mls in it. We found that 2 other cars we had bought also had similar situations even though service records showed they had been professionally serviced within the previous couple of weeks of us buying them.
    Another trap is these clowns that stick heavy oil (above the recommended 80 rating) in the gearbox, and/or use synthetics against makers recommendations.
    A mate of mine overseas who is an engineer has given details of why synthetics won't and don't work in the earlier gearboxes; it's something to do with the material used in the construction of the synchro rings and will give the impression of the synchros failing.
    If you want to drop me a PM I'll give you the formula I've successfully used.


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  4. #4
    Budding Architect ???? pugrambo's Avatar
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    after doing the oil check as per Alan's advice you may want to check your linkages
    3 x '78 604 SL

    1 x 2018 3008

    1 x 2000 Citroen XM,

    1 x '98 306 GTi6 sadly sold

    1 x secret project

    1 x '98 406 STDT troop carrier and i don't care if it stinks, i don't sniff it's arse Death by wank tank

    1 x '99 406SV 5spd wagon, time to burn more fuel

    1 x 1994 605 SV3.0

  5. #5
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    Default Gearbo on the way out

    It turned out to be a dry or almost dry gearbox. The oil had been leaking from the diff seals. Fortunatley I hadn't caused too much damage because once filled with oil it operated quietly without the earlier gear selection problems and noise.

  6. #6
    Moderator Alan S's Avatar
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    They are a rugged box when it comes to things like this.
    I once ran a CX for a few weeks with less than a cup ful of oil in it after a "specialist" I used to get to do my work, drained it, went for lunch, got caught out doing another job and simply dropped the bonnet and sent me on my way.
    In that case, I ended up with an occasional slow synchro on 4th but the car did tens of thousands of klms after that event with no other hassles.
    I'd be inclined to go with the Castrol VMX80 with 1`25mls of Nulon G70 and give it a couple of changes over say 6 - 10,000 klms just to wash any crap out that may have got in there with all the dry bits whizzing around for a while.


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

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