4.2 2+2 Gearbox oil leaking down speedo cable

[Bullfrog]

Hi,
I have the cable connector as tight as I can but it still leaks. I overfilled the gear box and that caused a lot to come down the cable but have taken oil to correct level. It only leaks when the car is driven. Do I need to put some kind of washer in the seat of the cable connector (or silastic)?

[Michael_Frank]

You might just want to undo the angle drive and let it sit for a few days, to let the excess oil drain off. Replacing the speedometer drive seals is a chore. But if it doesn’t dry up, you’re stuck with it. The external leak is a problem, but the bigger problem would be if oil made it through the angle drive and all the way to the speedometer. You can read more here:

What direction for speedo drive

I use Superlube, which is silicone grease. If you don’t use that, use a traditional grease, even white lithium would be good. I find that most synthetic grease separates, and you end up with an oily mess. Here’s what it looks like when the speedometer seal fails in the transmission, which is what they talk about in Smith’s instructions: [speedo grease] [sidebyside] The speedometer takeoff in the transmission can be removed and resealed without dropping the transmission, and this should cer…