wilanddij wrote:
An alternative to this to convert from Dexron to Transynd is to drain and fill with Transynd, run two years, and drain and fill with Transynd again.
For each drain & fill, how much fluid would I need for an Allison 1000 (4speed w/OD) tranny?
This is OK but you won't be getting the full benefits of TranSynd, both the oxidation resistance and the viscosity stability will be effected dramatically by the DEXRON-IIIH. With only one drain and refill, you'll still have over 60% DEXRON-IIIH in the system when you consider the oil volume in the torque converter and cooler lines. Best to change it twice and be done with it. Then, you're good for the full TranSynd drain intervals. With the mix, oil analysis will show the viscosity will continue to drop.
PS: Sump capacity on a 1000 Series is 13 quarts (shallow pan) and 15 qts (deep pan). Plus any makeup for the filter.
