Assuming that you've checked the fluid level and it's OK. Check with trans warm, and in D. RRC should have a trans dip stick
Low fluid can cause TC slippage. Also note colour of tans fluid, if dark(ish) or dark, as opposed to translucent .. then a change of fluid, or professional flush/fluid change, may help.
If the above has already been done, then:
Most likely that the torque converter clutches have died, causing slippage.
Brother is just going through this issue with his D2(TD5), he had lockup at normal speed, but any amount of throttle and it'd unlock, and vibrate too.
So he had lockup(eg. engine at 2000RPM at 100k/h, and even the teeniest amount of throttle, and it'd unlock instantly, and just a teeny bit more throttle, and it started to vibrate.
His D2 is currently at the mechanic getting the new torque converter fitted.
Can't find the exact values for the RRC, but the D1 is the same transmission, and will have similar values.
I think the stall test RPM speed is 2200-2400 for the V8(on a D1) .. can't see it listed for the RRC(with ZF) but one would assume it's the same/similar.
Like Philip said, the T/C lockup on the RRC/D1 ZF is mechanical, not electronic, and there is a solenoid thing inside the gearbox that operates this system.
So they're your two likely 'mechanical' culprits if fluid is clean/full/changed/etc.
Arthur.
'99 D1 300Tdi Auto
'03 D2 Td5 Auto
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