help w transmissions
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
Go right for the six speed! Installing the Last Automatic Transmission Your Hardworking Rig Will Ever Need
Its just about 12k when all said and done......
Its just about 12k when all said and done......
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,709
Likes: 2,629
From: SE Florida
Anything is possible given enough time and money. Are you asking if you can just take out the four speed and install any other transmission? The answer to that is no, that won't work. It takes a lot of time and money to do a swap like you're proposing.
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Trailering
Joined: Apr 2020
Posts: 22
Likes: 0
yeah ik that, i might just go for a manual, they seem to be cheaper and me reliable, i just hate where the selector would be, do you think a 5 speed would be enough to get the top speed up to 130 or should i probably go for a 6? assuming i disabled the speed limiter, it has 3.73 diff ratio
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Trailering
Joined: Apr 2020
Posts: 22
Likes: 0
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,709
Likes: 2,629
From: SE Florida
1:1 isn't overdrive, that's direct drive. Third gear in a 4R100 is 1:1. And overdrive in the 4R100 is 0.71:1, which is a higher overdrive than 0.76:1, so the 4R100 should give a higher top speed.
You add top speed by adding horsepower and reducing aerodynamic drag.
You add top speed by adding horsepower and reducing aerodynamic drag.
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Cross-Country
Joined: Feb 2020
Posts: 85
Likes: 1
Going to a 6 speed manual doesn't get you any better gear ratio in the highest gear. 4r100 is .71:1 in OD(4th) and the ZF6 is .72:1 in 6th to get to 130 with either trans you have to spin the engine to 3700 RPM. You need to go much shorter in the axle gearing or larger tires. Trucks generally don't like to go that fast.
Out of curiosity... Why do you want/need to get to 130 MPH?
Out of curiosity... Why do you want/need to get to 130 MPH?
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Trailering
Joined: Apr 2020
Posts: 22
Likes: 0
1:1 isn't overdrive, that's direct drive. Third gear in a 4R100 is 1:1. And overdrive in the 4R100 is 0.71:1, which is a higher overdrive than 0.76:1, so the 4R100 should give a higher top speed.
You add top speed by adding horsepower and reducing aerodynamic drag.
You add top speed by adding horsepower and reducing aerodynamic drag.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,709
Likes: 2,629
From: SE Florida
1:1 isn't an overdrive ratio.
There wasn't another transmission available in the Excursion. Every single 7.3L Excursion was built with the 4R100 four speed automatic. It's ratios are 2.71:1, 1.54:1, 1:1, and 0.71:1. If you have some other transmission you've made that transmission out of thin air. It doesn't exist.
There wasn't another transmission available in the Excursion. Every single 7.3L Excursion was built with the 4R100 four speed automatic. It's ratios are 2.71:1, 1.54:1, 1:1, and 0.71:1. If you have some other transmission you've made that transmission out of thin air. It doesn't exist.
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Trailering
Joined: Apr 2020
Posts: 22
Likes: 0
1:1 isn't an overdrive ratio.
There wasn't another transmission available in the Excursion. Every single 7.3L Excursion was built with the 4R100 four speed automatic. It's ratios are 2.71:1, 1.54:1, 1:1, and 0.71:1. If you have some other transmission you've made that transmission out of thin air. It doesn't exist.
There wasn't another transmission available in the Excursion. Every single 7.3L Excursion was built with the 4R100 four speed automatic. It's ratios are 2.71:1, 1.54:1, 1:1, and 0.71:1. If you have some other transmission you've made that transmission out of thin air. It doesn't exist.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,709
Likes: 2,629
From: SE Florida
It isn't, but the E4Od had exactly the same gear ratios as the 4R100.
The last year for the E4OD was 1998. Is your Excursion a 1998 or older? Since the first year of the Excursion was 2000, I suspect yours is not a 1998.
Once again, the ONLY transmission that was in a 2000 Excursion was the 4R100. There is no other possibility. I know you don't like that, but you're wrong, plain and simple.
The last year for the E4OD was 1998. Is your Excursion a 1998 or older? Since the first year of the Excursion was 2000, I suspect yours is not a 1998.
Once again, the ONLY transmission that was in a 2000 Excursion was the 4R100. There is no other possibility. I know you don't like that, but you're wrong, plain and simple.
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Trailering
Joined: Apr 2020
Posts: 22
Likes: 0
It isn't, but the E4Od had exactly the same gear ratios as the 4R100.
The last year for the E4OD was 1998. Is your Excursion a 1998 or older? Since the first year of the Excursion was 2000, I suspect yours is not a 1998.
Once again, the ONLY transmission that was in a 2000 Excursion was the 4R100. There is no other possibility. I know you don't like that, but you're wrong, plain and simple.
The last year for the E4OD was 1998. Is your Excursion a 1998 or older? Since the first year of the Excursion was 2000, I suspect yours is not a 1998.
Once again, the ONLY transmission that was in a 2000 Excursion was the 4R100. There is no other possibility. I know you don't like that, but you're wrong, plain and simple.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
The 4R100 can be built to handle 600hp no problem.
This truck with 33” tall tires and 3.73 gears will do 126mph at 3400 RPM’s A properly built 7.3 can safely spin faster than that.
You’ll need more money than sense to complete this project. Your posts would indicate you have little sense - or mechanical knowledge...
Perhaps you are just a troll?
On edit. Forgot to add Speed calculator. (For those who understand how to use it)
https://spicerparts.com/calculators/...rpm-calculator
