Ok, what is the E40D?
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Elder User
Joined: Aug 2005
Posts: 566
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From: New Jersey
Ok, what is the E40D?
I keep reading posts that the E40D is a 4 speed transmission. So is that 4 speeds plus the locking torque converter? Because when I drive my '93, I'm hearing 4 distinct shifts after first gear.
I thought it was 4 speeds overall because when I first got the truck (about two weeks ago) there seemed to be only 3 shifts. Then after driving it for a week or so, I started to notice that there was a quick shift after 2nd gear, like it was going almost straight through 3rd to 4th. Now, I'm getting 4 distinct shifts.
If this truck sat for a while before I bought it (which I think it did), is it possible that it was just working out some kinks?
Is it a big problem if it continues to shift quickly between 3rd and 4th, or is it pretty much normal under certain conditions (light driving, for example)?
Hope this post makes some sense.
I thought it was 4 speeds overall because when I first got the truck (about two weeks ago) there seemed to be only 3 shifts. Then after driving it for a week or so, I started to notice that there was a quick shift after 2nd gear, like it was going almost straight through 3rd to 4th. Now, I'm getting 4 distinct shifts.
If this truck sat for a while before I bought it (which I think it did), is it possible that it was just working out some kinks?
Is it a big problem if it continues to shift quickly between 3rd and 4th, or is it pretty much normal under certain conditions (light driving, for example)?
Hope this post makes some sense.
Last edited by matts156; Aug 27, 2005 at 11:43 PM.
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
E4OD Automatic Transmission
The E4OD transmission is a fully automatic, electronically controlled, four-speed unit with a locking torque converter. The main operating components of the E4OD transmission include a torque converter clutch, six multiple-disc friction clutches, one band, two sprag one-way clutches and a roller one-way clutch which provide for the desired function of three planetary gear sets.
Transmission gear selection in the (D) range and converter clutch operation is controlled by the EEC-IV control system. Operating conditions are relayed to Powertrain Control Module by various sensors throughout the vehicle. The PCM compares these conditions with electronically stored parameters and logically determines the state that the transmission should operate at.
In the (D) range, automatic operation of all four gears is possible. The Transmission Control Switch (TCS) lockout switch, located on the vehicle's shift lever disables overdrive operation and enables automatic operation through the first three gears. Whenever the ignition key is turned on, the vehicle will automatically provide overdrive operation regardless of the switch position the last time the vehicle was running.
Manual gear selection is available in the 1 and 2 range. Second gear is commanded when the gear selector is in the 2 range and when downshifted into the 1 range at speeds above approximately 56 km/h (35 mph) (for diesel 48 km/h [30 mph]). First gear is commanded in the 1 range at start-ups and when downshifted into 1 range below approximately 56 km/h (35 mph) (for diesel 48 km/h [30 mph]).
NOTE:
Any reference to Intermediate Brake Drum or Direct Clutch Cylinder are one and the same.
The E4OD transmission is a fully automatic, electronically controlled, four-speed unit with a locking torque converter. The main operating components of the E4OD transmission include a torque converter clutch, six multiple-disc friction clutches, one band, two sprag one-way clutches and a roller one-way clutch which provide for the desired function of three planetary gear sets.
Transmission gear selection in the (D) range and converter clutch operation is controlled by the EEC-IV control system. Operating conditions are relayed to Powertrain Control Module by various sensors throughout the vehicle. The PCM compares these conditions with electronically stored parameters and logically determines the state that the transmission should operate at.
In the (D) range, automatic operation of all four gears is possible. The Transmission Control Switch (TCS) lockout switch, located on the vehicle's shift lever disables overdrive operation and enables automatic operation through the first three gears. Whenever the ignition key is turned on, the vehicle will automatically provide overdrive operation regardless of the switch position the last time the vehicle was running.
Manual gear selection is available in the 1 and 2 range. Second gear is commanded when the gear selector is in the 2 range and when downshifted into the 1 range at speeds above approximately 56 km/h (35 mph) (for diesel 48 km/h [30 mph]). First gear is commanded in the 1 range at start-ups and when downshifted into 1 range below approximately 56 km/h (35 mph) (for diesel 48 km/h [30 mph]).
NOTE:
Any reference to Intermediate Brake Drum or Direct Clutch Cylinder are one and the same.
