Is Chrysler atf-4 fluid fully synthetic?

Answer 1

Depends which brand. The atf that the dealer sells, #05013457aa, is a semi synthetic. Valvoline +4 #346, is fully synthetic.

First of all, the dynamics between synthetic engine oil and Transmission Fluid are fundamentally different. Synthetic Engine oil is pure lubrication while preventing molecular degradation and absorbing heat. Transmission fluid functions as a hydraulic medium where today's modern transmissions can create 100-500 psi. A major problem inherent with hydraulic systems is dirt and debris. The filter must be changed whenever new fluid is added or else you're wasting money. The viscosity between conventional/synthetic hydraulic fluid is less of a concern, but a heavily "additive" hydraulic fluid can actually cause fluctuations within the pump and the psi pressure to allow smooth shifting and holding shift. Many of the posts deal with hydraulic leaks (100-500 psi - no wonder) because leaks develop around deteriorating gaskets, wiring harness inserts and various other probes which represent the weakest link in the hydraulic system. Many additives actually accelerate the degradation of these important gaskets, O-rings and synthetic rubber components within the transmission itself. In reality, the more benign the transmission fluid, the better it functions, plus changing the fluid every 20,000 miles on a regular basis. OBTW, never put a drain plug on the bottom of our transmission pan because you just created another weak link.

J.W. Mac