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Transmission Shifting Hard

demented

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demented Enthusiast

demented

Posted
Posted

Went out this weekend with a new trailer. The trailer was realk close to 10K fully loaded. the truck is a 2006 2500HD with the 6.0liter and a 4L80E tranny. It towed beautifully the entire trip but after about 40 miles of the trip the tranny started shifting hard and it didn't matter what gear it was in. Under light acceleration the tranny didn't shift too bad but yoy could tell it was very firm. Onder a load and mid to heavy acceleration it would shift very hard almost felt like someone was rearending the trailer. What could this be? If this was the older TH400 I would say that this thing had a broken accumilator spring or a stuck mainline pressure valve. Any ideas?

05GMCZ71 Enthusiast

05GMCZ71

Posted
Posted

Just to make sure, is the 2500 6.0L rated to tow 10,000 lbs? Did your truck also have a tranny temp guage? if so, what was the temp looking like? What does the fluid level look like and what does the fluid smell like?

 

If you are done towing, and if the truck is still acting like that, try disconnecting your positive & negative battery cables, touching them together, then reconnecting to battery, to reset the ECM. Then take her for a spin and see how she is shifting. If it is still shifting crappy, you may need to get her looked at.

demented Enthusiast

demented

Posted
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Posted

Well I do have a turn of events that had happened on this tranny problem. I scanned the computer last night and found a couple of tranny codes in it. first one was p-0741 which is a TCC system stuck off code and the other was a p-0894 which says tranny slippage. I cleared the codes and took the truck for a ride to go drop off my trailer at a friends house and the tranny shifted fine but after 15 minutes of driving the tranny temp went hot and the information center said the tranny was hot. I stopped to let it cool down and then when I left which was without the trailer the tranny again went hot. Shifting was hard during the whole time. To me it almost seems like the TCC clutch may have let go and started sending pieces of the clutch thru the system and started blocking off the cooler. Does this sound like a logical assumption????

Mike G Enthusiast

Mike G

Posted
Posted

Bummer... Does sound like something was soft insdie and loading a trailer up behind the beast was too much.

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