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Old 02-27-2018, 02:50 AM   #29
87Skier
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Join Date: Mar 2014
Location: Corvallis, OR
Posts: 711
Re: 4.8L/6L90E swap???

Open up VCM scanner and log "PRNDL status" and "Trans Shift Mode".

Shift into gear you want TUTD to work, and look at PRNDL status. Mine says D4 for example. Yours might be D5, D3, etc...

Whatever it says, make sure Trans > Auto Shift Properties > General > TUTD > Range Active, shows exactly the same.

Also make sure your settings match the ones in the pictures. Let me know if everything matches.
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1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205
1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears
1996 Chevy Suburban K1500 350/4L60E
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