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marpel's avatar
marpel
Explorer
Sep 18, 2021

New Truck question(s)

Good day,

As my current truck has reached it's retirement, I am beginning to look at a new vehicle.

We have a relatively small trailer (22' and about 5k lbs loaded) and have been towing it with a GMC Sierra, 6.2L, 6spd, 373. On short trips it has been a fine combo.

However, since the birth of a grand-daughter in Denver Co, we have spent every vacation driving back/forth from BC, Canada, via various interstates, with speed limits at 60/70/80, depending on location. And anticipate this will continue for a good number more years.

Currently, pulling at 63-64-ish, I put it in 5th, as in 6th it will constantly downshift at even the slightest incline/overpass. Much (like 80%) of the route is like this. Of course, up hills/mountains is understandably different.

I am considering going up in size to a 2500 or 3500 with the 6.6L gas, not diesel (may upgrade trailer in future), and am wondering if this would allow pulling in overdrive, rather than in 5th, during those long straight stretches. I am also considering the Ford 7.3 but think it may be a bit overkill for my needs, although it remains an option.

Any other thoughts would also be welcome.

Many thanks,

Marv

43 Replies

  • The 6.6 GM or 7.3 Ford gassers will still downshift in the same situation. Maybe even more so....less hp same torque and a heavier gross weight truck. Use a lower gear where the tranny won't downshift all the time.
    Now if your going to upgrade to a heavier trailer then a 3/4 tom makes sense.
  • 5th gear is also an overdrive in that transmission. So you are technically towing in overdrive, just not the highest one.
    You're current engine is rated 420 Hp and 460 lb/ft. The 6.6L is rated 401 HP and 464 lb/ft. So, you're not gaining anything but the power peaks are at a lower RPM which is nice.