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Old 01-20-2003, 11:28 AM   #1
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1986 25' Sovereign
Southern Middle , Tennessee
Join Date: Mar 2002
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Thumbs up Allison auto transmission O/D lockout

If you have the fine Allison 5 sp. auto transmission in your '01 or '02 Chevy/GMC truck, you have noticed that you do not have the ability to lock the Overdrive out and just use the 4th gear. GM has fixed this for'03 by installing an overdrive disable switch from the factory. Check to see if the O/D switch is available through your dealer yet. If not, it should be soon.
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