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Thanos · 03-16-2016, 06:40 PM

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 ...

03-16-2016, 06:40 PM	#16
Thanos Registered User Join Date: Feb 2016 Location: Louisiana Posts: 92	Re: 4l80e+GV or NV4500+GV 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 ...