Have a 4L80E in my 1997 truck. Truck is fairly large and has some minor engine work done to the big block. Transmission has a larger cooler installed, Mag Hytec Pan that holds about 3 extra quarts, and a Transgo HD2 shift kit. Truck has 93k on it.
Ive changed the tranny fluid ancouple times via pan drop. Most recently was about 3k miles ago when the new pan and larger cooler was installed. This time I installed the new pan, filled it up, and then flushed about a gallon through the cooler line out before hooking every thing up and refilling back to spec. This time I used Valvoline Max Life Dex VI.
The transmission has always shifted fine and had firm shifts, especially with the shift kit installed, but once the truck for a while, ive always notice the shifts get a little less firm, still good just seems like its a little different. Has been like this as long as i can remember. Could be ancomputer thing, who knows.
Anyway with that background info is there anything else you guys would suggest? Was VI a bad idea? Should i try to find some Dex III equivalent to put in? I see so much contradictory info on if the Dex VI shoukd of been installed in a Dex III transmission. Basically that viscosity levels are different even though VI is backwards compatible etc. Whats the real answer. Also I see many people talk about Red Lubeguard. Should i throw some of that in for good measure?
Thanks
Ive changed the tranny fluid ancouple times via pan drop. Most recently was about 3k miles ago when the new pan and larger cooler was installed. This time I installed the new pan, filled it up, and then flushed about a gallon through the cooler line out before hooking every thing up and refilling back to spec. This time I used Valvoline Max Life Dex VI.
The transmission has always shifted fine and had firm shifts, especially with the shift kit installed, but once the truck for a while, ive always notice the shifts get a little less firm, still good just seems like its a little different. Has been like this as long as i can remember. Could be ancomputer thing, who knows.
Anyway with that background info is there anything else you guys would suggest? Was VI a bad idea? Should i try to find some Dex III equivalent to put in? I see so much contradictory info on if the Dex VI shoukd of been installed in a Dex III transmission. Basically that viscosity levels are different even though VI is backwards compatible etc. Whats the real answer. Also I see many people talk about Red Lubeguard. Should i throw some of that in for good measure?
Thanks