Front driveshaft slips insideTransfer case like it isn't engaging all the way on 2008 Chevrolet Silverado 2500 HD

Mostly when torque applied

Asked by for the 2008 Chevrolet Silverado 2500 HD
1 answer 1 comment
Do you have it in 4 wheel drive when checking??
Yes, when I step on the gas it slips...a mechanic, without looking, said it might be a sensor