DEXRON III LICENSE
DEXRON III CRACK

No one in this universe would be able to tell you the exact seal compound in your seals in the hydraulic or power steering systems.

DEXRON III CRACK

If the seals in your hydraulic and power steering system are made from a certain type of Viton (fluoroelastomer) known in the industry as 'non-base resistant', then, they may not be compatible with DEXRON-VI and may harden and crack over time. My recommendation is to stick with the BP Autran Syn295 fluid. Most of those older DEXRON fluids passed both specs.

So, instead, they call the fluids 'D3M' which indicates that the formulation, at one time, passed both the GM DEXRON-IIIH specification and the Ford 'MERCON' specification. NOTE: Manufacturers can no longer use the word 'DEXRON' on their packaging since the DEXRON-III specification is obsolete. See what they put in it and let us all know !!! Once it's warmed up, it should be in the 'HOT' band under the same conditions. Make sure the fluid is in the 'COLD' band when cold with vehicle on a flat surface, transmission in 'P' and engine at idle. Did they use a 'flushing machine'? Or, did they just drain it and refill it? I'd check the fluid level using the dipstick and the onboard electronic shift selector method. Maybe they introduced air into the fluid by either under filling or over filling. My bet is that it's something else may be a contributing factor in the harsh shift. Testing for these type fluids includes frictional testing and the test requirements were basically equal for the Allison TES-295 and GM DEXRON-III specifications.

DEXRON III LICENSE

TranSynd had a GM DEXRON-III license at one time (way back). I don't know what fluid they installed but, most would be compatible from a frictional properties standpoint. I don't believe you'd see (or feel) any real difference in what we at GM referred to as 'shift feel' under most shifting conditions (upshifts, downshifts, wide open throttle or closed throttle). The change from TranSynd to DEXRON-III (probably a modern day 'D3M' fluid) would typically not manifest as a harsh shift. Hope this helps !!! For more about API Base Oil Groups and how they are defined visit API Base Oil Definitions. A list of approved TES-295 fluids can be found at Allison TES-295 Approved Fluids List Allison recommends TES-295 approved fluids (Castrol TranSynd, BP Autran Syn 295, Shell SPIRAX S6 A295, Mobil DELVAC Synthetic ATF, etc.). I don't believe they are recommended today either. Please note that DEXRON-VI fluids are not recommended for Allison products built prior to 2007. Do to some unique requirements, listed in the Allison TES-295 specifcation, the TES-295 approved fluids are formulated with true synthetic (API Group IV) base oils. Generally, they were good fluids but tended to lose viscosity (thin out) over time. DEXRON-III fluids were mostly based on a mixture of API Group II base oils with good additives packages. These older specifications were replaced by GM DEXRON-VI ('6').

GM DEXRON-III fluid specifications (DEXRON-II, DEXRON-IIE, DEXRON-III, and DEXRON-IIIH) are now obsolete.

DEXRON-III 'was' a General Motors specification for automatic transmission fluids and described the testing requirements for fluids to pass in order to be considered for approval by the GM ATF Committee, of which I was a member for around 20 years. DEXRON-III is not a synthetic and it's also not an oil brand. I'm back after being away for a long time. Can you use Dexron III ATF synthetic in place of TransSynd

Dexron iii