E4OD Question
Freshman User
Joined: Jul 2004
Posts: 30
Likes: 0
the E4OD
is a 4 speed auto,
Almost every transmission, that says overdrive,
just means it has 4 speeds, vs a 3 speed.
WHY, cause it sounds good that you have Over Drive!
the first 3 gears are Multiplication of torque,
and the 4th gear is a 1:1 ratio, or less, like .9:1 ratio,
which is What Over Drives do.
all in all
they are ALL 4 speed automatic transmissions now a days.
is a 4 speed auto,
Almost every transmission, that says overdrive,
just means it has 4 speeds, vs a 3 speed.
WHY, cause it sounds good that you have Over Drive!
the first 3 gears are Multiplication of torque,
and the 4th gear is a 1:1 ratio, or less, like .9:1 ratio,
which is What Over Drives do.
all in all
they are ALL 4 speed automatic transmissions now a days.
Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
To be qualified as an "overdrive" tranny, the top gear must be less than a 1:1 ratio. While the E40D is a 4 speed automatic, it effectively is a 5 speed. Most automatics are effectively one more speed than rated because of the torque multiplication effect of the torque converter, which upon take off doubles up the torque at the expense of halving the speed, so you get an extra low take off gear. That is one reason the first gear in an automatic is usually not that low, typically 2.50:1, but the torque multiplication effect will usually double that for digging out of the hole. I think the E4OD on my motorhome actually has more than a doubling effect, but can't remember the exact amount (2.4 maybe).
Trending Topics
Elder User
Joined: Apr 2002
Posts: 813
Likes: 0
From: NJ
the e4od is a 4 speed with 4th being overdrive it also has a lock up converter that will lock up in any and all gears
. so i guess you would call it a 4 speed trans.
sorry to disagree with tall paul but it only has four different gears not 5 but it does feel like 5 when the converter locks up.
. so i guess you would call it a 4 speed trans.
sorry to disagree with tall paul but it only has four different gears not 5 but it does feel like 5 when the converter locks up.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
Well, guess I could have said it differently. The E4OD is a 4 speed, but the bonus is that first gear functions like a lower gear on take off and so you sort of get a variable ratio out of first.
Postmaster
Joined: Dec 2002
Posts: 3,959
Likes: 9
From: USA
Whatever the gears are called, their ratios are:
First = 2.74, (this could be off, I've also heard it's 2.84)
Second = 1.55,
Third = 1.00,
Fourth (OD) = 0.71.
For comparison, my C6 auto's ratios are:
2.47, 1.43, 1.00
First = 2.74, (this could be off, I've also heard it's 2.84)
Second = 1.55,
Third = 1.00,
Fourth (OD) = 0.71.
For comparison, my C6 auto's ratios are:
2.47, 1.43, 1.00
Thread
Thread Starter
Forum
Replies
Last Post
RCrawler
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
9
May 4, 2020 02:12 AM
Jrock909
1987 - 1996 F150 & Larger F-Series Trucks
14
Aug 11, 2006 04:54 PM
jason79045
Clutch, Transmission, Differential, Axle & Transfer Case
3
Sep 7, 2002 10:05 PM