Medium and Heavy Trucks
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good evening my name is ***** ***** I will assist
some reasons it pops out of gear
1. incorrect ratios from front to rear. that is if one of the differentials has a different ratio than the other
2. tires, they need to be the same size. incorrect roll speed will cause it to pop out of gear
3. yes, the case itself is worn out. the syncros are bad.
replacing with a used part. re build would be about triple the price