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Re: 4l80e+GV or NV4500+GV
Quote:
Originally Posted by Thanos
Tow/haul causes the trans to not shift into 4th and allows for the engine to rev higher before shifts, you NEVER tow in OD. I have 2500 HD with a allison they say DO NOT TOW IN OD. My suburban with a 4l80e would never shift into 4th when tow/haul mode is on.
I honestly thought everybody on here would know this however I am going to back out of this thread because its the wrong forum for this level of transmission knowledge. Thanks anyway.The Semi comment was a classic!
Call your local transmission shop about towing with OD on your 4l80e aka th400r4 ,nv4500,4l60e aka th700r4 ...
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Just reading through the current 2500HD owners manual, and it specifically says:
"Vehicles can tow in D (Drive). Shift the transmission to a lower gear if the transmission shifts too often under heavy loads and/or hilly conditions."
Which is what pretty much everybody has suggested here. The big enemy of automatic transmissions is heat - as long as it isn't hunting and locking and unlocking the converter, there's no reason not to use it.
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Last edited by JJorgensen52; 03-16-2016 at 08:32 PM.
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