Forum Discussion

berfle's avatar
berfle
Explorer
Jan 13, 2017

Workhorse Allison Jumped from 5 to 6 Speed (on its own)

I have a 2010 Bounder 33u on a Workhorse Chas is with Vortec 8.1 and Allison 5-speed (approx 26,000 miles). I've read that the 5-speed can be changed to a 6-speed but this is pretty strange. We've be...
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rgatijnet1's avatar
rgatijnet1
Explorer III
Jan 13, 2017
I believe that in 2005 the Allison 1000MH transmissions ALL went to 6 speeds. By 2010, you already had a 6 speed transmission from the factory. If it was NOT shifting in to 6th gear, which is a double overdrive(5th and 6th are both overdrives), it is because of some problem with the transmission control module(TCM).

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