I have a new '05 LLY 4x4 and would like to run synthetic oil in it. What is the recommended brand and weight for the following items:

Engine Oil
Transfer Case
Differential

I live in Northern Florida so it does not get extremly cold. Lows in the low 30s for winter and highs in the upper 90s in the summer.

I have about 1500 miles on the original fluids and would like to change them out to synthetics soon. Also is there some other fluids I should change in addition to the listed above?

Thanks in advance.

Brad

1. 10w-40 -10qts
2. mercon 3 - 2qts
3. syn. 85/90w diff oil (can go up if in warm climate) 85/140w and if tow alot of wieght
i still run dino oil for brake in period 10000 mi. 15w-40 delvac1300 at walmart 6.00 a gal. then i will switch to syn.

Amsoil 15W-40 in the motor, Amsoil Sever Gear 75W-90 in diffs unless towing heavy loads on a regular basis. Amsoil Torque Drive in the trans. Run dino for at least 3k miles before switching and I would change oil at least 3 times in the first 3k mile at 500, 1500 and 3000. THis has been a proven method by many here on the forum.

Greg