Genesis 3.8 BH Under Chasis Trouble/Noise

model : Genesis 3.8 2009
Mileage : 40000 KM
group :Under chasis
Subject : underneath whinning/grinding noise during driving
1) Condition

• underneath whinning/grinding noise during driving specially at 70 – 80 km/hr.

2) Cause

• Differential oil burnt out of specified viscosity

3) Diagnosis

• make road test to verify the problem.
• check the oil/viscosity

4) change differential oil

Look under enough cars and you'll see this from time to time. The rear differential is mounted in 3 places, but it looks like a 4-point mounting was considered earlier in the program. Think about it: are four chair legs as easy to balance as three? Of course not. Tripods and three-legged barstools rule. It's not precisely the same situation with vibrations, but the principle applies.
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