Transmission Questions
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Junior User
Joined: Feb 2006
Posts: 64
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From: Colorado Springs
Transmission Questions
Ok new here and wondering something, I have a 2001 F250 7.3 and a buddy of mine has a 2003 F350 6.0. I understand I have a 4r100 tranny and he has a 5r100 tranny. Question is whats the diffrence between the 2. Any and all help would be great.
Elder User
Joined: Aug 2003
Posts: 568
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From: Kansas
The 5r100 has the "torque shift" feature that they put behind all 6.0's. I have one of the last 7.3L's built in 03 and it has the 4r100. What the exact difference is, someone else will have to chime in here.
Senior User
Joined: Mar 2006
Posts: 253
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From: Northwest OH
For starters, the number of gears. The torque shift tranny has 5 gears vs 4 gears in the older tranny. The torque shift tranny has a higher torque rating & has a tow/haul mode which, depending on load and road conditions will tow in overdrive & hold the gears longer. The torque shift tranny also locks the TC more often (Even on slowdowns - in tow/haul mode).
The greater number of gears seems to make the truck a bit quicker by keeping more in the power band.
The greater number of gears seems to make the truck a bit quicker by keeping more in the power band.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
I gotta ask, will the 6.0 transmission retrofit into the 7.3. Would it be worth it or just have mine properly rebuilt. I know I'm not happy with my OD gear on the interstate with no load, I would prefer lower rpms at 75 mph. Is it any better with the 6.0s?
Posting Guru
Joined: Jul 2003
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The 5R110 will not mate to the 7.3L. An adaptor could be built, but that will cost almost as much as rebuilding a 4R100. Then you'd have to create a computer to run the 5R110. The computer that the trucks use needs to control a 6.0L and 5R110 together to be able to work. Short answer, it can't be done.
Also, the OD ratio is 0.71:1 in both transmissions.
Also, the OD ratio is 0.71:1 in both transmissions.
Senior User
Joined: Mar 2006
Posts: 253
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From: Northwest OH
Basically, same answer as Casey. I would doubt the possibility of a retrofit because of the PCM/computer/programming compatability factor. A 6.0L PCM would be different than the 7.3L PCM.
In terms of the RPM factor, I would not assume that it would be lower as the 6.0L has a reasonably higher redline.
In terms of the RPM factor, I would not assume that it would be lower as the 6.0L has a reasonably higher redline.
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Postmaster
Joined: Nov 2003
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From: Utah County, UT
Originally Posted by Tenn01PSD350
I gotta ask, will the 6.0 transmission retrofit into the 7.3. Would it be worth it or just have mine properly rebuilt. I know I'm not happy with my OD gear on the interstate with no load, I would prefer lower rpms at 75 mph. Is it any better with the 6.0s?
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Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Originally Posted by Clint Knotts
I here good things from everyone here about Jody's tunes and how he adjust shift points in his tunes and wonder if he can write programs to do a retro fit? I think I like the ideal of haveing another gear.
Junior User
Joined: Jan 2005
Posts: 68
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I think I need a differant gear inbetween 2nd and 3rd on hard pulls because I run out of power in 3rd and have to slow down below 45mph to go into 2nd.My gearing to power is off alittle. Maybe a few power mods would make the differance I am looking for.My truck is stock 2000 F-350 DRW 4X4 with 4.10 rearends and 235 tires.
