More Bronco q's
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Freshman User
Joined: May 2003
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More Bronco q's
what exactually is a electronic cruise servo with integral control on the 93 and up Bronco's? Also what is a better auto trans, the A0D, the A0DE, or the E40D what problems do they have and which one has fewer problems?
Post Fiend
Joined: Nov 2002
Posts: 9,987
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From: Memphis, TN
More Bronco q's
You can see that cruise servo in the truck parts album in my signature link, but here's the direct link.
The early cruise system used a large vacuum motor attached to the L fender bracket near the hood hinge with a cable running to the throttle lever to control engine speed when the system was engaged. But if the engine vacuum got too low (like long sustained hill climbs while towing with a weak engine), it would lose the necessary vacuum to operate, and shut off. It was also sensitive to contamination, had a low-frequency VSS (and very delicate on pre-'87 trucks), and was difficult to diagnose. The control module mounted under the dash above the gas pedal, which meant there were a LOT of wires penetrating the firewall, and even a large vacuum line for the brake safety override. It worked when it was new, but it wasn't a very elegant solution.
In '93, trucks got the new all-electronic servo that some cars had been using for a few years. Besides being totally self-contained (except for the same buttons on the steering wheel) and MUCH more reliable, it added features like 1-MPH per touch on the ACCEL & COAST functions, an exact low-speed cutoff (30mph for all applications), and more responsive & predictable RESUME function, even when engine vacuum is low (because it doesn't use any vacuum). Since the control buttons are electrically identical to the old system, it's fairly easy to upgrade. And the fact that ALL current Ford vehicles use this servo (with various-length cables by application) makes junkyard supplies cheap & plentiful.
Baumann will sell you a beefy version of any of those transmissions (the truck version of the AOD-E is called the 4R70W, and the current E4OD is the 4R100), so they can all be built strong. After '95, Ford started using the upgrade parts in the E4OD that had given it a poor reputation to that point, but it's actually one of the strongest & most reliable slushboxes.
The early cruise system used a large vacuum motor attached to the L fender bracket near the hood hinge with a cable running to the throttle lever to control engine speed when the system was engaged. But if the engine vacuum got too low (like long sustained hill climbs while towing with a weak engine), it would lose the necessary vacuum to operate, and shut off. It was also sensitive to contamination, had a low-frequency VSS (and very delicate on pre-'87 trucks), and was difficult to diagnose. The control module mounted under the dash above the gas pedal, which meant there were a LOT of wires penetrating the firewall, and even a large vacuum line for the brake safety override. It worked when it was new, but it wasn't a very elegant solution.
In '93, trucks got the new all-electronic servo that some cars had been using for a few years. Besides being totally self-contained (except for the same buttons on the steering wheel) and MUCH more reliable, it added features like 1-MPH per touch on the ACCEL & COAST functions, an exact low-speed cutoff (30mph for all applications), and more responsive & predictable RESUME function, even when engine vacuum is low (because it doesn't use any vacuum). Since the control buttons are electrically identical to the old system, it's fairly easy to upgrade. And the fact that ALL current Ford vehicles use this servo (with various-length cables by application) makes junkyard supplies cheap & plentiful.
Baumann will sell you a beefy version of any of those transmissions (the truck version of the AOD-E is called the 4R70W, and the current E4OD is the 4R100), so they can all be built strong. After '95, Ford started using the upgrade parts in the E4OD that had given it a poor reputation to that point, but it's actually one of the strongest & most reliable slushboxes.
