I have a problem with my datsun 200b it taking me 3 year and it not full rebuilt. The tailshaft has been service by hardy spicer and I had all 5 brand new tyres and balance. I have test drive the datsun which has a Automatic transmission and found when drive it about 25klm and about the car is vibration and I am not sure if it the torque converter. Has any one have the same problem.

Unfortunately, there are many more things that could be causing this issue.
I would recommend driving faster.

Or take it to a mechanic for an inspection.

Things to Consider,
Wheel Bearings
Engine or Gearbox mount
Exhaust/intake leak causing the engine to run poorly

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