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Allison 6sp: Possible limped transmission
Not sure on the condition of the trans prior to me purchasing the truck. I believe it was a pipeline truck. So I am assuming it was primarily used for towing. Purchased it with 230,000 miles on it. Prior to the Transgo Jr. install the tranny was hesitating a bit half way through the 3rd to... -
Allison 6sp: Possible limped transmission
So I did some reading and there are some posts that say it could be multiple things causing the tie up (Trying to think optimistically :) ). Apparently it could be a bad speed sensor, or wiring, improper clutch clearance or damaged tone wheel on the front rotating assembly or transfer case... -
Allison 6sp: Possible limped transmission
Alright just took it out again, checked the fluid it smelled a little burnt but seemed to shift through all the gears like it should. Finally accelerated like I did the other night and same thing 4th - 5th drops it into 4th and won't shift past it. Cycled the key a few times it would... -
Allison 6sp: Possible limped transmission
I have not. I believe the NSBU switch is inside the trans on the 6 speed, but I'll crawl under there tomorrow and see if any sensors/ wiring is smashed. -
Allison 6sp: Possible limped transmission
Yea that was the only problem I have ever had trying to flash it and it wasn't that big of a deal then. So the theory then is my TCM lost communication for a brief moment with the rest of the truck and got thrown into limp mode? Seems kinda weird -
Allison 6sp: Possible limped transmission
Those three codes were the only ones I could pull off of it. From what I've read the flashscan V2 should be able to see TCM codes or am I missing something? -
Allison 6sp: Possible limped transmission
Driving my truck last night got into the throttle a little (about 3/4 throttle) with it on the 90 horse tune and my transmission hit fourth harder than usual and fifth harder too then dropped right back to fourth gear and wouldn't shift past it. I was a mile from home and just got home. Went...