Chevy and GMC Duramax Diesel Forum banner
1 - 8 of 8 Posts

· Registered
Joined
·
34 Posts
Discussion Starter · #1 ·
Transynd or DexIV? I'm confused on which one to use, thanks in advance.
 

· Registered
2006 LBZ, 2009 LML, 2022 L5P. 1993 6.5 parked in the shed.
Joined
·
1,656 Posts
Transynd. 295 or 668, doesn't matter, but Transynd over Dex6 everyday.
 

· Registered
Joined
·
26 Posts
I have the same question, new to me, 2011 Chevy 2500HD. Likely due for a transmission flush. Unsure if it ever been done, I'll have to go through the service records that came with the truck. Sounds like the Transynd is the way to go. But if there's Dexos in it can they be mixed? If I decide to go with the Transynd?
 

· Registered
2006 LBZ, 2009 LML, 2022 L5P. 1993 6.5 parked in the shed.
Joined
·
1,656 Posts
They will mix fine. No flush required (and not Allison recommend either). Change it, drive it for a bit, change it again. Allison considers that good enough for extended warranty in applications they provide warranty (non pickup application). If you want to get super picky, look up the Hoot method, not required but it is more complete (and more work, fluid). When I switched over I just did the double drain, that was ~200k ago in 2008.
 

· Premium Member
Joined
·
1,348 Posts
Delvac comes in the 668 as well
 
  • Like
Reactions: DonkeyDiesel
1 - 8 of 8 Posts
Top