laynlow77

iTrader: (8)

my manual says 6. many people have told me that 3 is fine. ive also heard there is an additive that turns the 3 into 6. thoughts?

DBVille

If the manual says VI, why would you go with III? Save $30-$60? On a transmission that will cost $1,000-$2,500 to repair/replace? I believe GM recommends VI on all trucks 2006 and later, and says VI is a direct replacement for III in earlier models. And, it can be mixed with VI.

GM does not have an additive to convert III to VI.

Red04Silverado

iTrader: (2)

Put VI in and dont look back.

budhayes3

iTrader: (19)

You can always go up (III to VI), but you shouldn't go back (VI to III), if the manual says VI, go with VI

2005 Silverado

iTrader: (19)

100%

Dustin

Fireman31

Dex VI is synthetic and better in almost everyway when compared to Dex III......

laynlow77

iTrader: (8)

bump. im doing this tomorrow

is there a reason that the 06 needs 6, but 05 uses 3. are the internals different?

DBVille

The fluid came out to support a 6 speed tranny, I believe. However, the VI is better all around, and is recommended for all III applications. It is used as OEM fill on all GM autos.

When I change my '05 fluid, it will be with VI.

negativeswitches

iTrader: (15)

6 will help make your tranny outlast your motor

laynlow77

iTrader: (8)

well, i went down and saw my trans guy. he assured me that the 3 and 6 are nearly the same but the six has a couple different additives in it. i wound up going with 3 and the additive he told me to put in. the gm tech also told me that there isnt much difference.

this is what i did last time as well and i havent had any problems yet....