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Allison Trans. Shudders Under Load
First time posting here. Need someone to bounce ideas off
of. I've driven this truck nearly a hundred miles without
load while monitoring TCC slip speed and gear ratio without
issue. (It did set a P0729 Incorrect 6th gear ratio once on
him months ago) 
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| Engine | 6.6 L |
| Trans | 6-speed Automatic (Electronic) |
Vehicle Data
2018 GMC Sierra 3500 HD 6.6L
| Engine | 6.6 L |
| Trans | 6-speed Automatic (Electronic) |
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