I just turned 5000 miles on my 05 GMC 2500HD D/A. I had the tranny flushed and a new filter installed, the fuel filter changed and the oil and oil filter changed. I did this as I want to go on a 5000 mile regime. At every 5000 I change oil; every other 5000 I will be changing fuel filter and spin on tranny filter as well as the oil and oil filter.
Since the tranny flush I have noticed my tranny gauge temp seems a bit higher. was usually below 150 solo and up to about 175 towing. Now seems up to 150 solo and just under 200 towing. I must admit that the temperatures are higher at this time and I was in a warmer area. I cannot imagine that there would be a change due to the flush but thought I would ask the group.
Thanks

Moving to correct forum, please try and post in the specific section for best exposure and feedback.

Cut your old fuel filter open and see how soiled it was. I planned to change mine at 10,000 mile too, but unfortunately I was left stranded at the side of the road at 8,700 miles. I cut the old filter open and it was totally black (used up). I'm doing 7500 mile intervals on them henceforth.

Cut your old fuel filter open and see how soiled it was. I planned to change mine at 10,000 mile too, but unfortunately I was left stranded at the side of the road at 8,700 miles. I cut the old filter open and it was totally black (used up). I'm doing 7500 mile intervals on them henceforth.

Make sure you use good diesel fuel from a reputable station. High traffic (especially from large diesel trucks) is good. I also suggest getting a secondary fuel filtration (nicktane.com).

I also change my fuel and allison filters at 10K miles or every other oil change. I can't comment on the temp difference since when I had mine flushed it was getting a suncoast level IV installed and synthetic fluid as well as the Mike L. tranny cooler. Mine actually runs a lot cooler now than it did stock. The upgraded tranny's tend to run hotter than the stock ones.

Could you tell me more about the Mike L Tranny cooler. Where I can get it and cost. I tow a large trailer and need good cooling.
Thanks
Bob

Could you tell me more about the Mike L Tranny cooler. Where I can get it and cost. I tow a large trailer and need good cooling.
Thanks
Bob

Bob
You can call me or send me a PM or email me lovrich7@aol.com
mike

You can PM Mike L. and he can give you the details or call him at Inglewood Transmission - you can find his number in the supporting vendor list. I just put mine on this past weekend, fluhed the trans with mobil 1 and put on the deep pan.....Bill