I wanted to change my tires but only had 2 new ones at the time. Also I didn't know they were LT type rather than P type and were 75s rather than 70. The mechanic brought it to my attention and informed I couldn't have 2 different type and size tires on a 4WD, though I drive my truck at 2Hi most of the time (rarely do I use AWD option, and even far less have ever used the 4Hi or 4Lo options). I ended up buying 2 tires from him and since I wanted to upgrade, I bought the same new type and size. (So I went from P245/70r16 which are OE demand, to upgraded LT245/75r16, but different brands. Goodyear Wrangler brand on the fronts, Grenlander L-finder brand on the rears). Issue?: Twice my rear tires slid on wet pavement turning left/right while decelerating. Several times now, the front tires (passenger side, I strongly believe) spins out on wet pavement during take off acceleration at a curve, when cornering, even at a straight take off, and I don't speed off. If it helps I did not have the tires undergo a wheel alignment or rotation yet. So I believe that even a dumb question is just as important which is why I'm posting this. What is happening to my Street Queen? Is the truck affected by the new type and size of the tires? Or by the mixed brands? Or am I overreacting on an issue that simply can be resolved by alignment/rotation service? Thanks Guys.