The weather was fickle yesterday. It was a mostly cloudy day, however the temperature reached the upper 70s. This is higher than we’ve experienced all week. We felt a stray rain drop or two before dinner, but there wasn’t enough to wet anything.

I’ve decided to have our transmission serviced before we leave Grand Junction. Our coach is equipped with an Allison 3000 MH 6-speed automatic transmission. It came from the factory filled with Allison – Castrol TranSynd® synthetic automatic transmission fluid (ATF). The service records are incomplete, but I see where the transmission was serviced at least once in the past. It appears that the fluid was changed to standard Dexron III ATF.

There’s nothing wrong with running Dexron III in this transmission. The issue is the longevity of this fluid. In this application, the Dexron III ATF breaks down and needs to be changed every 25,000 miles. The Allison – Castrol TranSynd® synthetic ATF is very robust. It can hold up for up to 300,000 miles, but should be monitored through fluid analysis annually.

The downside to the TranSynd® ATF is initial cost. The retail price runs from $40 to $55/gallon, depending on where you buy it. When I was at the Cummins dealer the other day, I asked about having the transmission service performed. They told me that changing the ATF and both filters would take about three hours and the cost would be $499 with Dexron III ATF or $599 with synthetic ATF. They didn’t use the Allison-approved TranSynd®. They used Valvoline SynGard®. This sounded high to me, so I held off and said I would get back to them for an appointment.

The higher initial cost of synthetic ATF is more than offset by its longevity. I was about to make the appointment when Donna mentioned the diesel truck service center across the street from the RV park. She thought I should talk to them and get another quote for the work.

I went to Diesel Services, Inc. (DSI) yesterday. I talked to the service manager, Dave. He told me they use genuine Allison high-capacity filters and genuine Allison – Castrol TranSynd® fluid. He said the cost for a transmission service on our coach would run about $300. I was surprised. On the RV forums (IRV2 and RVNet), most people say they pay $450 to $600 for this service.

I asked Dave how he could do the job for that price. He said, “It’s not rocket science.” They would pull the coach into the service pit, drain the fluid, change the filters and add new fluid – about an hour’s worth of work. It takes four to five gallons of ATF @ $42/gallon. Add $40 for the filters and an hour of shop time. I said, “Sign me up.”

We have an appointment for Tuesday morning, when we pull out of Junction West RV Park. We’ll see how it works out. I’ll probably have the ATF and filters changed again in a year. There will be some of the old Dexron III fluid left in the transmission torque convertor which will blend with the synthetic fluid. After that, I’ll only change the filters and top up. We’ll pull a sample when the filters are changed and have it analyzed for contamination. We should be set for the life of the transmission at that point.

While I was out, Donna went out for a bike ride and got in another 25 miles and came back with a smile on her face. The Montana State Senior Olympics is just one month out, so she’s trying to get in as much riding as she can. Her race is 40K (25 miles).

Last evening, I grilled Jamaican jerk boneless chicken thighs for dinner. Donna served it with mango salsa and steamed asparagus. This is one of my favorites.

Jamaican jerk chicken thighs with mango salsa

After dinner we took a stroll through the park. We met a woman, Linda. She pulled into the park earlier in the day with a 35′ travel trailer. She’s been on the road, alone, for about a year and a half. We talked with her for a while and learned that she’s 71 years old and enjoys hiking, mountain biking and mountain climbing! You meet the most interesting people in this lifestyle.

Today, the temperature is projected to reach the mid 80s. I don’t have an agenda for the day, so I’ll just see what comes next.