Forum Discussion
FIRE_UP
Dec 04, 2018Explorer
Well,
Our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT and the Allison MH3000 trans was outfitted from the factory with Dex III or IV, I can't remember. If I recall, by reading up on it waaaaaaay back then, the MH3000 units came with Dexron but, the 4000 units came with Transynd.
But, contacted the gent mentioned earlier who's the foremost authority on Allisons and he advised me on the correct procedure for a complete change-over to Transynd. I did that about 5-6 years ago and have been happy ever since. I now have about 45,000 miles on that change. Trans works like a gem. Personally, I'd never dump any Dexron back into a trans that's full of and, been operating on Transynd.
Scott
Our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT and the Allison MH3000 trans was outfitted from the factory with Dex III or IV, I can't remember. If I recall, by reading up on it waaaaaaay back then, the MH3000 units came with Dexron but, the 4000 units came with Transynd.
But, contacted the gent mentioned earlier who's the foremost authority on Allisons and he advised me on the correct procedure for a complete change-over to Transynd. I did that about 5-6 years ago and have been happy ever since. I now have about 45,000 miles on that change. Trans works like a gem. Personally, I'd never dump any Dexron back into a trans that's full of and, been operating on Transynd.
Scott
About Motorhome Group
38,763 PostsLatest Activity: Dec 13, 2025