Allison Tranny?
Posting Guru
Joined: Jan 2004
Posts: 1,736
Likes: 1
From: Monroe, MI
the torque shift was originally designed to be a 6-speed auto. 2 of the gears were so close the decided to convert it to a 5 speed auto
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Lead Driver
Joined: Jul 2004
Posts: 6,951
Likes: 512
From: Foothills, CA
Interesting note is that my '07 TS equipped PSD turns lower RPM at a given cruising speed than my '05 Dmax did with a 5 speed Ally. In fact, the 6 speed Ally had a reported around 1600 RPM 60 mph cruise which is close to what my '07 PSD is at...!
The 6 speed Ally is a 2 overdrive gear unit, both 5 and 6 are overdrives. Why is it we need a 6 speed Torqshift?? I'm quite happy with 5....
The 6 speed Ally is a 2 overdrive gear unit, both 5 and 6 are overdrives. Why is it we need a 6 speed Torqshift?? I'm quite happy with 5....
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Junior User
Joined: Oct 2005
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because mainstream consumers care about numbers, and the bigger numbers the better. do we need 650lb-ft from the factory? no(but im not complaining), but if thats more than the competition then that will be one more reason for the consumer to pick that over the others.
Junior User
Joined: Oct 2005
Posts: 60
Likes: 0
There are definate advantages to having more gears. Not all of them have to be at the top end. If you can start at a little lower ratio and finish at a slightly higher one it reduces slippage in the lower gears and reduces engine rpms in the upper. Both equate to better efficiency. Also the "jump" between gears is reduced making shifting smoother. For the average every day driver (which is getting less and less with fuel prices these days) this really doesn't make much difference. However, under load this greatly reduces wear and tear and extends engine and transmission life.
Post Fiend
Joined: Apr 2004
Posts: 19,098
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From: Great State of Texas
Welcome to FTE and the 6.4 forum Montanan SD
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Senior User
Joined: May 2005
Posts: 327
Likes: 1
From: Columbia, MO
With larger loads (towing a trailer of some sort) the splits between 1-2, 2-3, 3-4, is just about right (400 rpm or so). But the split from 4-5 is much larger (about 800 rpm or so). For use in hills, mtns etc it would be nice to have another gear between the 4-5 shift that changed at about 400 rpm.
Laughing Gas
Joined: Mar 2006
Posts: 1,083
Likes: 1
From: Fitzpatrick Alabama
That could very well be true, but the Ads specifically had a Ford and said Allison, and I just didn't see how that made sense. Especially since DaimlerChrysler bought DetroitAllison from GM.