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The 6 speed is far superior to the 4l80
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The 700r4/4L60 in our old Suburban had to be helped out to make it work right towing a load. It would bog down to about 25mph without shifting (D not O!) and then scream up to about 50 and shift up and then start bogging down again.
I learned to pull it down into D2 at about 45mph and then it would hold 45-50 all the way up without too much drama, which is plenty fast enough for a winding mountain pass. Of course that's just a 5.7 TBI, good engine but what - maybe half the power of a 6.0 ?
We have several big fire trucks with older model Allisons. Last summer I took the big tender out on a fire and afterwards detoured over to the nearby very small town to fill it up at the high speed well. I
forgot they don't hold back when you go down hill like my six speed Silverado, but fortunately it was empty and had good brakes! Damn things make you get careless which doesn't happen with a manual. We've only got
one M35 type left with a 5 speed manual, and it's kept on a volunteer's ranch down south a ways because we don't have enough room in our fire hall anymore.