Allison Transmission
How often do you have your Allison 6 speed transmission serviced?
Forum Discussion
The only time you need to drop the pan and change the pan filter is during a rebuild. Changing the pan filter is not considered a maintenance item. Change the spin on filter when replacing the trans fluid. Being a 2003 if it hasn't been changed then it's probably Dexron III. There is no way to determine which is in the transmission. Testing the fluid only determines the amount contaminants and if it should be changed. To change to Transynd you need to do a double drain and replace. Drain the fluid and replace with the same amount of Transynd. If you allow the rig to sit for a few days you'll drain out more fluid since some of the fluid in the torque converter has drained into the pan. You're looking at 12-14 quarts, depending on how much as drained from the torque converter. Drive the rig to mix the Transynd with the remaining Dexron III. Drain and refill again with Transynd and replace the spin on filter.
If you choose to have it done as opposed to doing it yourself DO NOT let them do a power flush. Allison strongly recommends against that.
The double drain procedure meets Allison specs and you can now use the Transynd maintenance schedule. There is an Allison sub-forum on irv2 forums. A member there is a former Allison fluids engineer and can answer any further questions you have.
Transynd is expensive and you won't find it at your local auto parts store. Any truck service center will have it available. If you choose to do it yourself go to the Allison website. You'll find a list of fluids that meet the TES-295 (Transynd) spec. You can then search the internet to find the best price.
If you choose to have it done as opposed to doing it yourself DO NOT let them do a power flush. Allison strongly recommends against that.
The double drain procedure meets Allison specs and you can now use the Transynd maintenance schedule. There is an Allison sub-forum on irv2 forums. A member there is a former Allison fluids engineer and can answer any further questions you have.
Transynd is expensive and you won't find it at your local auto parts store. Any truck service center will have it available. If you choose to do it yourself go to the Allison website. You'll find a list of fluids that meet the TES-295 (Transynd) spec. You can then search the internet to find the best price.
