Almost 146000 on ours no problems, we tow 6k to 20k miles per year. Had a problem like you describe with a chevy once; it was the wrong gear lube that I put in. Book said synthetic when the vin number indicated regular 80/90 weight with a fish oil additive for the limited slip.
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2016 Axis 24.1 E-450 6 spd tranny
300 watts portable solar.
200 watts solar on the roof.
Wrangler JK dinghy
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