Allison Transmission

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Allison Transmission

Home > Discussion Forum > Mechanic's Corner - Transmissions

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All Messages in Thread	Author	Date
Allison Transmission	Gary	2-8-02
I have a 1993 Euro Premier built on a Spartan chassis with Cummins 5.9 and Allison 6 sped trans. When I hit a bump the transmission shifts down a gear. Have had it checked out at a Freightliner shop. They agree there is a problem but can't find the source.
Re: Allison Transmission	Mike Croom	2-9-02
There could be a bad electrical connection or vaccumm hose that might have a crack in it causing this problem. Let us know what you find that is the cause. I have a 1993 Euro Premier built on a Spartan chassis with Cummins 5.9 and Allison 6 sped trans. When I hit a bump the transmission shifts down a gear. Have had it checked out at a Freightliner shop. They agree there is a problem but can't find the source.
Re: Allison Transmission	JJ	2-9-02
There could be a bad electrical connection or vaccumm hose that might have a crack in it causing this problem. Let us know what you find that is the cause. spartan chassis have a common problem with the throttle position sensor linkage at the fuel pump wearing out and dropping below the minimum percentage and causing a failure code also power and gounds to the ecu are common problems and a loose speed sensor tone wheel could cause eratic shifting I have a 1993 Euro Premier built on a Spartan chassis with Cummins 5.9 and Allison 6 sped trans. When I hit a bump the transmission shifts down a gear. Have had it checked out at a Freightliner shop. They agree there is a problem but can't find the source.