I have a 2006 Chevy 2500 hd with the Allison transmission. I have 78,000 miles on the vehicle, most highway mileage. I do pull a 31' travel trailer about 3 times a year. I have not yet changed the transmission fluid yet, although the spin one filter has been changed every 5,000 miles. I have heard different ones say if the fluid isn't bad then don't change, you can do mor harm changing than not.
My question is will it do more harm than good to change the fluid now?
Side note - would be going back with the recommended DEXTRON fluid. The company I work for takes care of all the filter changes. All filters, oil, fuel, trans, all get changed every 5,000 miles. They use the Dextron fluid....don't want to mix fluid types.
I just had my truck serviced by our company mechanics and the trans fluid is just as red as if new. No filings in the filter or on the magnet.
We are a Crane and rigging company and have serveral trucks that have the Allison 1000 series trany in them. As a company we use Baldwin filters for everything oil, fuel, trany, air. These are all changed every 5,000 miles. So, every five thousand miles or so I get a 1/4 quart fresh tran fluid. Figure over the 16 filter changes ive got about 4 quarts fresh trany fluid.
I would switch to synthetic but since my company takes care the filters and fluids don't want to mix them. We have a couple of fuel trucks that take a way worse punishing than my truck they are on the road all day every day, always loaded and all they do is change the filter every 5000 miles and they have over 100k miles on them never had any trany problems. They have the same trany.