ECM Reflash - TSB Help

[WOT]

I just got my truck back from the shop and they performed a ECM reflash based on TSB 18-015-00. The sticker under the hood now says the ECM part number is 353431304J.

Anybody know anything about this reflash/TSB?

My original complaint to them was that I seem to have less power than I did when I first got it & that after about 1 minute of WOT pulling my trailer up the mountains I felt like I was losing some power. I have 34k miles on it now.

I sure hope I don't loose any MPG because of this! I have been getting 18 MPG at 75-80 MPH on the highway with a little in town driving. Not bad for unloaded with 4:10 gears I guess.

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2000 QuadCab, 4x4, 2500, 6spd, Intense Blue Pearl, No mods as of yet!

 

[PRout]

Something sounds wrong if you need to keep yours wide open for a minute.

I pull a trailer that weighs just under 10,000 lbs up all kinds of grades and haven't ever had to floor it. I'd hate to keep that much pressure on for very long.

 

[WOT]

I have had to since it was new. I have a 7500-8000# trailer (loaded) and when I run up a couple mountains in West Virgina and Virginia and give it WOT in 6th gear at about 70 MPH. It used to slow a little and then hold at 65. Last couple of times I have had to go to 5th and hold at 60-65 (2800-3000 RPM, don't like to take it beyond that).

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2000 QuadCab, 4x4, 2500, 6spd, Intense Blue Pearl, No mods as of yet!