Hi guys I'm wanting to service my 3.0 td gearbox and was wondering if anyone has any hints or tips plus which oil should I use? Cars on 160k so won't last much longer anyway
 
Do you know the correct oil and temperature?

Texamatic 7045E is the correct oil for the GM box.

Ensure the filler plug on the gearbox will remove BEFORE draining the sump. Mine was very, very tight I had to remove the front prop to get a 6 sided socket/ratchet on it to remove it.

HTH
 
Taken from the WM, hope this helps you out.

44.24.02 Gearbox fluid - drain & refill - AUTOMATIC TRANSMISSION - GM 5L40-E
Drain
1. Position vehicle on lift. WARNING: Observe due care when draining gearbox fluid as the fluid can be very hot.
2. Apply handbrake and position chocks under front and rear wheels.
3. Position container under gearbox.
NOTE: The fluid should be drained with the transmission at normal operating temperature.
4. Clean area around drain plug.
5. Remove and discard drain plug.
6. Allow fluid to drain.
7. Clean drain plug mounting, fit new drain plug and tighten to 20 Nm (15 lbf.ft).
Refill
1.Clean area around filler/level plug.
2.Remove and discard filler/level plug.
3.Add 3.5 to 4.0 litres of correct fluid through gearbox level/filler hole.
4.Fit new filler/level plug and tighten to 20 Nm (15 lbf.ft).
5. Check and top-up fluid level - *** Gearbox fluid - Td6 ***

Gearbox fluid - Td6 - Check top-up
1. Position vehicle on lift.
2. Apply handbrake and position chocks under front and rear wheels.
3. Connect TestBook/T4 to monitor gearbox fluid temperature. CAUTION: The gearbox fluid level must only be checked when the temperature of the fluid is between 35°C and 45°C. The reading obtained will be incorrect if the fluid is outside this temperature range.
4. Start engine, move selector lever from 'P' through all gear positions, pausing in each gear position for 2-3 seconds and return to 'P' position.
5. Clean area around filler/level plug.
6. With the engine running, remove filler/level plug and allow excess fluid to drain off. WARNING: Observe due care when draining gearbox fluid as the fluid can be very hot.
7. If no fluid loss is apparent when filler/level plug is removed, with the engine at idle, fill gearbox with recommended fluid until a small thread of fluid runs from filler/level plug hole. WARNING: Avoid excessive skin contact with mineral oil. Mineral oils remove the natural fats from the skin, leading to dryness, irritation and dermatitis.
8. Move selector lever from 'P' through each gear position and return to 'P' , allowing any excess fluid to drain off.
9. Fit new filler/level plug and tighten to 20 Nm (15 lbf.ft).
10. Disconnect TestBook/T4.
 

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