Tips for Lightning and
Other Truck Owners
The new Baumann Electronic Controls Website is now open providing the latest technical and product information. You will also find information on our new Referral Incentive Program which pays you cash for referrals.
For the same information presented here on our new website go to http://www.becontrols.com/tech/ch6e4odinfo.htm You will also find links to much more technical information.
The E4OD four speed automatic transmission is used in F and E series
trucks, as well as AOD and AOD-E/4R70W four speed automatic transmissions.
To determine which is used in your vehicle, follow these guidelines:
The E4OD has seen many changes and updates since its introduction in 1989,
but most later transmissions will prove reliable with nothing more than
our ReCal-Pro™ E4OD valve body recalibration kit and a "low pressure drop"
auxiliary oil cooler (an OEM auxiliary cooler, if installed, is usually
adequate). Baumann Engineering supports the E4OD with the Baumannator
TCS™ electronic transmission control system (which provides complete
control of all transmission shift points, as well as torque converter clutch
operation and part-throttle shift firmness). Baumann Engineering can also
provide custom-built torque converters for the E4OD transmission as mentioned
in the "Torque Converter Upgrades" section of
If the shifter has a P-R-N-OD-D-1 pattern, the transmission must be an
AOD (applicable to 1980-1993 vehicles).
If a 1989-1993 truck has an Overdrive Cancel Switch and a P-R-N-OD-2-1
shifter pattern, then it is equipped with an E4OD transmission. With the
possible exception of some 4R70W equipped 1993 E-150 vans with 5.0L SFI
engines (The existence of a 1993 4R70W van is unsubstantiated).
1994 and later vehicles with four speed automatic transmissions will all
have an Overdrive Cancel Switch and a P-R-N-OD-2-1 shifter pattern, but
may have either an E4OD or a 4R70W transmission. All 4.2L, 4.6L and some
5.0L engines use the 4R70W transmission, while diesel, 4.9L, 5.4L, 5.8L,
6.8L and 7.5L vehicles always use E4OD’s. You can measure the transmission
fluid pan to determine which transmission you have if identification information
is not available. A 4R70W transmission pan has an overall length of just
under 15 inches, while an E4OD pan is much larger, measuring about 20 inches
in overall length.
If it becomes necessary to overhaul your E4OD transmission, you should
perform as many updates as possible if it is a pre-1995 unit. E4OD component
updates include, as an example, the following items:
V1.1 © Copyright 1994, 1995, 1998 by Karl
Baumann. All rights reserved.
Please see the Performance Guide Index (pguide.htm)
for complete copyright information.
Improved (thicker) converter clutch piston (circa 1994), prevents the formation
of cracks which relieve fluid pressure from the apply side of the clutch,
causing it to slip and even bluing the outside surface of the torque converter
in extreme cases. Ensure that your new converter contains an updated OEM
or "LuK" brand heavy-duty clutch. This can be difficult, as many torque
converter suppliers and remanufacturers may not use this new style of clutch.
Higher displacement front pump (for 1995) provides more fluid capacity
for faster engagement of reverse and greater lube flow.
New (for 1994) 4-pinion overdrive planet and input shaft assemblies replace
older 3 and 4 pinion units which tend to develop cracks in the carrier
under heavy loads.
Center support update kit (for units built from 1989 through part of 1994)
replaces wear-prone bushing with a ball bearing and contains a new overdrive
Stronger overdrive clutch cylinder snap ring which will not dislodge.
Revised sun gear and rear case bushings (circa 1992 model year) provide
longer wear life and better lubrication.
Four pinion planet carriers (first used in 1992 model year)
New forward clutch friction plates with hardened internal splines cure
"chatter" and "no-drive" conditions in E4OD and some later C-6 transmissions.
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BAUMANN ENGINEERING & DESIGN
702 SOUTH MECHANIC ST
PENDLETON, SC 29670
Phone: (864) 335-9365
| FAX: (864) 335-9055
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© Copyright 1998, Baumann
Created as new page on:
10/23/98 This page was last updated