Date registered: Aug 2006
Vehicle: 2002 ML320, 2003 A160
Location: Brisbane, Australia
Mentioned: 2 Post(s)
Quoted: 498 Post(s)
Your local garage lacks the skills/knowledge/tools required to fix this problem. Unfortunately it's time to cut your losses with them and find a new mechanic - one with experience in repairing Merc gearboxes.
The reason your local mechanic wants to replace the transmission is because he doesn't know how to repair it. It's probably something really simple like incorrect fluid level - normally you need to check and correct the level after driving, following a fluid change & flush. (This requires a special dipstick that isn't fitted to the car like the engine oil dipstick.)
If that doesn't fix it, the gearbox needs disassembly to remove and clean the sticky valve.
You can check out this table of causes. See "Shudder in 2 -> 3 power upshift", two rows:
Last edited by DrX; 08-25-2016 at 08:15 AM.