Funny i just had mine rebuilt by goerge and it does the same my converter is white ppe !I drove 7hrs hope its not a major issue...
Allison 5sp: Harsh 4-5 shift or harsh lockup?
- Thread starter Devon
- Start date
I'm hoping the same! I mean, it very well could be a tuning issue, under normal driving conditions and even getting into it moderately the converter locks up nice and firm. But Wot is a different story.
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I am planning to get ahold of him soon and see what he thinks. I just know I have had tunes on mine from more than 1 reputable tuners (robs also) and its acted the same. Gonna try to get to the bottom of this soon though.
Theres a big difference between a solid lock up and what I am experiencing. You need to distinguish that difference first before you make assumptions about the PPE. My truck feels like its about to jump off the road and the tires chirp like a bitch.
Mine is the same. Has not changed from tune to tune. You can press it almost to WOT and it'll feel good. WOT is an entire different story.
^^^^exactly! Feels like it jumps when it locks up. definatly not the norm. Hopefully someone can chime in that has had this issue and maybe resolved,
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no mine isnt that bad but it shifts harder for sure just 4-5 could be normal its only WOT i havent logged my trans yet i got all new tunes coming from rob so im gonna wait till i flash them in and see :thumb:
Spoke with George and, it sounds like the c3 clutch pack may be glazed over and the Trans is trying to compensate by adding more pressure on the 4-5 shift. If it was a converter issue, it would be whenever it locked up, wot or not. Just some of the info I have gathered. We will have to see.
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Maybe your situation is different. I highly doubt your clutch packs are bad lol. I mean I know George, and he is the kind of guy that will assure you that your Trans is running perfect before you go on your way. My 06lly was built by him and it was such a nice shifting Trans.
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Not saying you do or dont have an issue but the 4-5 can feel a lil more firm then the others from the converter being lockd!
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Refresh my memory,doesn't the TC unlock during the shift for like a millisecond then re lock after the shift? If so maybe its in the tune and the event isn't correct making it significantly harsher? Have you tried different tunes and see if it does it the same?
What happens when everything ,tunes, engine and transmission is returned to stock? That would be my diagnostic start. Then you can see if it is a hard part issue or else-wise.
I could be wrong about the TC unlock if so diss regard but I recall hearing or seeing that.
What happens when everything ,tunes, engine and transmission is returned to stock? That would be my diagnostic start. Then you can see if it is a hard part issue or else-wise.
I could be wrong about the TC unlock if so diss regard but I recall hearing or seeing that.
Depends what TCM OS you have. The early 5 speed TCM's unlock teh converter on the 4-5 shift, but the LLY TCM OS does not.