F250 Auto Trans Upgrade
Elder User
Joined: Nov 2013
Posts: 524
Likes: 0
From: Maryland
If your sure that your truck has the AOD and not the E4OD, then you could upgrade to either the E4OD (auto) or the ZF5 (manual). Both are of relatively equal strength. The ZF5 would be easier since both it and the AOD do not require computer additions or modifications.
Elder User
Joined: Nov 2013
Posts: 524
Likes: 0
From: Maryland
You've got the best auto trans that came in these trucks Imo. C6 internals with OD/electronic lockout, if your looking for an extra gear, anything is poss with enough time and cash, but I would look for a newer super duty if you want a 5 or 6 spd bad enough
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
X2...you have the best transmission available at the time. Later versions will not fit your engine unless you go to extremes and make an adapter then figure out how the computer can control it.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Better in what way?
What engine does your truck have?
How big/heavy is the trailer?
What engine does your truck have?
How big/heavy is the trailer?
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Fleet Owner
Joined: May 2009
Posts: 21,437
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From: Gilbert, PA
For more torque you want lower gears
But for lower rims at highway speed you want higher gears
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,723
Likes: 2,650
From: SE Florida
If you want a lower overdrive ratio you'll need to design and build custom gears. You could buy a whole fleet of brand new trucks for much less than that would cost.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Lots of ways to get that and it gets discussed all over this site on a nearly daily basis so start reading.
Which means more horespower. See answer above.
OK here's the dirt. Forget about achieving 80mph at 1500rpm that is just not gonna happen, even when built up this motor should be turning about 2500rpm at that speed otherwise it will be totally under geared for towing. So no you can't have your cake and eat it too, you could get those results with a new diesel truck but those don't deliver super high fuel milage while towing either, so I don't know if it would be worth the cost for you.
Which means more horespower. See answer above.
OK here's the dirt. Forget about achieving 80mph at 1500rpm that is just not gonna happen, even when built up this motor should be turning about 2500rpm at that speed otherwise it will be totally under geared for towing. So no you can't have your cake and eat it too, you could get those results with a new diesel truck but those don't deliver super high fuel milage while towing either, so I don't know if it would be worth the cost for you.
Lead Driver
Joined: Feb 2013
Posts: 5,006
Likes: 72
From: Roseville, MN
Couldn't a higher stall speed torque converter be a non-engine way to get more torque / power? Any time the torque converter clutch isn't locked up you'd have higher engine speed, which would likely move you up the torque and power curves. But when the TCC locked up you'd be back where you started, so at least it wouldn't make the engine run faster at higher speeds.
Of course you never get something for nothing. I'd expect more heat meaning more fuel during acceleration. And it'd make a good cooler all the more important.
Of course you never get something for nothing. I'd expect more heat meaning more fuel during acceleration. And it'd make a good cooler all the more important.
