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Old 04-28-2019, 05:27 PM   #3 (permalink)
D_R_C
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Join Date: May 2007
Location: Rocky Top, USA
Posts: 4,053

My ? would be are you using towhaul when towing ?
If not then start using towhaul when towing, Allison will suggest the same.
And yes, try to get the TCM codes read.
What's actually wrong don't know until you get the code numbers.
And the repair cost, same answer as above.
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2007.5 GMC "Black" Sierra SLT 3500HD SRW C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe
DHD PCV Re-route
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2007 GMC Yukon Denali "BLACK" 6.2 gasser, DIY stock airbox mod, K & N OEM drop-in, Airaid intake tube, EFILive TCM tuned

Last edited by D_R_C; 04-28-2019 at 05:29 PM.
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