2019 Sierra 1500 and AMSOIL OE Fuel Efficient ATF vs Signature Series compatibility?

[newdude]

5 hours ago, khjenki said:

How did the switch to Amsoil go?

 

I’ve got a 19 LTZ Z71 with same 5.3L/8 spd and had a flush at 56k using the updated fluid + a Valvoline additive which the dealer suggested.

 

I’m now at 78k miles and while better than before, I’m again noticing harder shifts in and out of 1st/2nd.

 

Also want to replace shocks/struts as I’ve had a pop from driver side since 32k miles which dealer hasn’t been able to diagnose after several tries.

 

Haven't wanted to throw parts at it but concerned I could also have a bad motor or body mount. Reading bad driver side motor mounts and transmission/lifter issues can all occur concurrently.

 

 

Should not have any additives.  Dealer shouldn't be recommending that.  

[customboss]

2 hours ago, SteelD6 said:

The switch to the Amsoil Signature ATF was completed and the problems with the transmission are gone. Obviously too soon to tell about the durability of the fix, but so far I am pleased. Truck smoothly shifts through gears upon brisk acceleration from stop to 73 mph and also smoothly accelerates from 73 to 85 when passing. 

I changed to Amsoil signature series at about 13000 miles on new 2022 LTD Trail Boss 8 speed 2.7 turbo 4 and it has 57000 or so now not ever an issue.