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: transmission seems to be shuttering/ banging Brent Bissel 04-21-2005, 12:27 PM transmission seems to be banging / shuttering when shifting into second and third. I've noticed this a little bit lately when driving down the road. But I let a friend of mine haul his boat appox. 10,000#, he had it in tow mode and said it really shuttered and banged when shifting into second and third. I don't think this is normal and I have 35,350 miles on the truck it's a 2003. Mackin 04-21-2005, 05:23 PM I'll move this to the Allison forum so you will get more responses. I will suggest that you visit your dealer or a Friend that knows and has a Tech II GM scan tool and reset the tap cells in that shift.It will relearn and hopefully smooth out Good luck Mike L. 04-21-2005, 05:59 PM How about some history on the truck as in mods, programs past problems. mike Brent Bissel 04-22-2005, 07:57 AM The only mod. That i've made is adding the predator on the 40 hp setting. There have been no past problems with the truck. Machinator 04-26-2005, 09:59 AM If you are running in Tow/Haul mode it could be the TC locking up as it is comes on between 2nd and 3rd gear (about 25MPH). If it does it in both normal mode and Tow/Haul it may be a problem with the C3 or C4 clutch. The extra horsepower could also be upsetting the adaptive shifts. If that's the case it will clear itself up with continued driving. | ||