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Exhaust leak affect Shifting?

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469 views 0 replies 1 participant last post by  496Ally 
#1 · (Edited by Moderator)
I have an 8.1 Allison and the passenger side manifold has an exhaust leak, the transmission how a bizarre shifting pattern where sometimes it shifts great and other times not so much, I notice the truck shifts best when the transmission is around 180 degrees or so. as well as it will also shift decent when the manifold is hot enough to close up the leak a bit. been fighting this transmission for months now trying to perfect it and don't know what would the best move? reset the taps? etc...
 
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