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  1. #1
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    LT77 Gearbox - Fill plug

    I decided to change/fill the gearbox oil on what I believe to be an LT77 box. Jacked up the car to discover that there's no fill plug! Is that right or am I missing something here? There's a small leak from the drain plug and i don't know how long its been leaking. It made sense to drain and fill it because for all i know it might be empty!

    Anyone have any suggestions on how I fill it?
    Dax MK4, RV8

    Better to try, and fail....than to fail to try.

  2. #2
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    Quote Originally Posted by bigkev38 View Post
    I decided to change/fill the gearbox oil on what I believe to be an LT77 box. Jacked up the car to discover that there's no fill plug! Is that right or am I missing something here? There's a small leak from the drain plug and i don't know how long its been leaking. It made sense to drain and fill it because for all i know it might be empty!

    Anyone have any suggestions on how I fill it?
    It should be on the passenger side of the gearbox casing, about halfway up the side.

    Russ.
    Joint Area Rep - East Midlands Region
    1984 DAX Cobra
    Rover 3.5 V8 with Holley carburetor.

  3. #3
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    Quote Originally Posted by Russ-Notts View Post
    It should be on the passenger side of the gearbox casing, about halfway up the side.

    Russ.
    No fill plug just the drain plug at the bottom. I can see both sides as clear as day and there's no other plug on the black gearbox housing. I was expecting it to be above the drain plug, but there's nothing there on either side.
    Dax MK4, RV8

    Better to try, and fail....than to fail to try.

  4. #4
    Join Date
    Apr 2005
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    I struggled to find mine a few weeks ago, but it is there.

    It's further back than you'd think. I think it might even be on the silver rear casting rather than the darker main casting.
    Regards

    Craig Perry

    No, I'm not "repairing" it, I'm fine tuning its performance.

  5. #5
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    Quote Originally Posted by cperry View Post
    I struggled to find mine a few weeks ago, but it is there.

    It's further back than you'd think. I think it might even be on the silver rear casting rather than the darker main casting.
    Can't say i looked on the silver casing I will pop out and have another look, thanks Craig
    Dax MK4, RV8

    Better to try, and fail....than to fail to try.

  6. #6
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    Apr 2005
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    If you scroll down a bit, there's a photo showing it here.

    https://www.pistonheads.com/gassing/topic.asp?t=1601403
    Regards

    Craig Perry

    No, I'm not "repairing" it, I'm fine tuning its performance.

  7. #7
    Join Date
    Sep 2004
    Location
    Bressingham
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    1,348
    I have seen some with the level plug not machined. I think they have a nice Leyland logo there instead.
    I suspect it is a fill once for life thing or maybe refill to quoted capacity after draining.
    The bung at the back will feed forwards as far as i remember. I think there is also a breather on the very top that could be used.

    Then of course there will be the debate about what sort of oil to use... and how much.
    A S motorsport Ltd. 01379 688356 mob; 07909531816 web; asmotorsport.co.uk email \"andrewsoar@yahoo.com\"

  8. #8
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    Oct 2013
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    Quote Originally Posted by bigkev38 View Post
    Can't say i looked on the silver casing I will pop out and have another look, thanks Craig
    Cheers Craig, you were correct I found it at the back on the silver part. Unfortunately access is almost impossible. Short of removing the passenger seat and drilling a very big access hole in the tunnel there's no way i'm going to get a spanner in there. It's going in for it's MOT tomorrow morning so I will ask if they have any ideas or specialist tools. Of course having a car lift is already a good start for them, so fingers crossed.
    Dax MK4, RV8

    Better to try, and fail....than to fail to try.

  9. #9
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    If you can’t get the filler tube from the oil bottle in there, surely you can get a long, thin pipe into the hole and fill it with a funnel remotely?

  10. #10
    Join Date
    May 2016
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    Hockley ,Essex
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    I have rv8 with a fully rebuilt LT 77 gearbox ,the oil that I use is a ford MTX 75 grade ,overfilled by a half a pint.
    Some use ATF but was told by a good source that the MTX was far superior .
    The official oil to use is EP 80 grade,
    Hope this helps, Chris.

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