I think it's a turbo350 trans tho you may be able to identify it better by the pic I have attached as I believe you can tell from the shape of the sump. Anyway at the back of the box is the small end that bolts to the box at one end and at the other end the axle slides in, the box also houses the speedo gears and entry of the speedo cable.
This has been on as the plastic speedo cog was split so small box was removed cog and pin replaced and all put back together again. Filled wither oil and it's now leaking!!! Where the small box connects to the main gearbox there was no gasket so should it have one there as there must be all inside the small box as it's also leaking past the speedo entry cable and housing.
There are two o rings where the cable enters and cable housing enters the small box I'm guessing replacing these too will stop that issue and I'm guessing I take the 2 to the o ring shop and have them replaced with the correct size they should be? Or is this a part that must be oem? Also will instant gasket be okay for the join between the small box and main gearbox or again Is that an oem part also??
Sorry lots of guessing etc but like I said robins away n your on the ball
