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fool32696 10-11-2006, 12:34 AM I thought that I've read to lock out OD you just hold the tow/haul button. Is there a light or something to confirm it's locked out? I've been unsuccessful at doing anything other than turning tow/haul on/off. I have an 02 GMC 2500hd dmax. Thanks JoshH 10-11-2006, 12:43 AM The OD lockout feature wasn't available until '03. If you want it on your truck you will have to retrofit it. FlyACL 10-11-2006, 12:45 AM After 03, it will show a D with a \ through it... SMITH6.6 10-11-2006, 01:14 AM john kennedy has the direction on how to install it, I put it on my truck fool32696 10-11-2006, 09:56 PM Smith, did John Kennedy do a writeup on the procedure here on the site or did you contact him in person? I'm very interested in doing the mod. Jimmy JoshH 10-11-2006, 11:11 PM Click here for Kennedy's writeup. (http://kennedydiesel.com/docs/Allison%20OD%20lockout%20final.htm) fool32696 10-11-2006, 11:32 PM Thanks, that's what i needed:ro) CRASHNBURN 10-11-2006, 11:42 PM Is that lockout still on the 06. I thought my 2004.5 had it, but I do not think the 06 have it. JoshH 10-11-2006, 11:49 PM No, you have the manual mode. CRASHNBURN 10-12-2006, 12:23 AM Yes I know I have that, but I thought I had something else too. I guess I am just remembering my old truck. modified 10-12-2006, 09:39 AM Read here: http://dieselplace.com/forum/showthread.php?t=48880&highlight=ODLO neubauej 10-13-2006, 12:32 AM Yes I know I have that, but I thought I had something else too. I guess I am just remembering my old truck. If you dont want to use any O/D, use manual mode, and select 4. ;) | ||