Wwblue05
SDD Junior Member
Hi Guys, somewhat of a Newbie here, searching for info on just this problem (soft or slipping upshift from 3 to 4 with Torqshift, 6.0). Have noticed the same soft, or drawn-out, slow shift from 3rd to 4th on my '05 6.0. It was always that way, but after adding a B-D tuner about 16 months after buying the truck new (Jul. 2005) it would occasionally shift very hard from 3-4, even on gentle acceleration from a stop. It was like it would slip very briefly, allowing the engine to rev, then slam into gear, like as if you put it in N, rev'd to about 1800 rpm and pulled it into gear. Eventually asked the B-D tech people about the sudden, very hard shift, as I was very concerned about it. The reply at the time was that the trans has to relearn every time I changed the tune level of the tuner program, which I could do on the fly. I did change the tune level pretty often, mainly trying to determine which level gave me the best mileage, and I did notice that after a few shifts this hard shift would quit. About 6 months ago the slip-shift became persistent, but only occasionally doing the rev with hard shift. Then it started doing like a free-wheeling after acceleration, whether hard or gentle acceleration the going into cruise mode with the throttle, then would down-shift suddenly and shift back up very firmly.
This week I finally took it to a dealer, but not the one I have always gone to for service. The service mgr. called and asked if I had had a tuner in it, or have a tuner in it. (Had removed the program, but have the B-D Monitor gauge pod on the dash, which can be installed and used without a tuner program). Then he said some code showed that a tuner program had been in it. (This I had never heard of, and wonder if anyone has.)
My main Question though, is, how common is the soft, slow upshift from 3 to 4 with the 6.0 5spd auto., and, is it very common for this to worsen to the point of really being a problem in driving, or outright failure, with or without a tuner?
[I have done all maintenance since new that the owners manual calls for, including the trans., and would ask the service writers if anything else was needed. (That did not prevent the egr/oil cooler failure from happening right after my 75K warranty went off, and right after I had service done at about 73,500 to leave on vacation, where I started noticing strange symptoms. Was told "everything is OK" at the service, when in fact the oil cooler was already clogging up with bad coolant.)]
This week I finally took it to a dealer, but not the one I have always gone to for service. The service mgr. called and asked if I had had a tuner in it, or have a tuner in it. (Had removed the program, but have the B-D Monitor gauge pod on the dash, which can be installed and used without a tuner program). Then he said some code showed that a tuner program had been in it. (This I had never heard of, and wonder if anyone has.)
My main Question though, is, how common is the soft, slow upshift from 3 to 4 with the 6.0 5spd auto., and, is it very common for this to worsen to the point of really being a problem in driving, or outright failure, with or without a tuner?
[I have done all maintenance since new that the owners manual calls for, including the trans., and would ask the service writers if anything else was needed. (That did not prevent the egr/oil cooler failure from happening right after my 75K warranty went off, and right after I had service done at about 73,500 to leave on vacation, where I started noticing strange symptoms. Was told "everything is OK" at the service, when in fact the oil cooler was already clogging up with bad coolant.)]
