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I have a 1989 Bronco II (2.9L/ A4LD/ 4.10 gears) and that little engine just screams going down the highway. It has been a while since I have been on the highway so going from memory but the tachometer indicates the engine is turning around 3,500rpm. I don't notice a rpm drop once in fourth gear so I'm not really sure the converter is actually locking or not. Does anyone have this combination that can confirm if this is normal? If I plug the numbers into an engine rpm calculator it should be a lot lower that what I am seeing.
Counting the transmission shifts, it is definitely in 4th gear. I'll have to put another tachometer on it to see if it is wrong but it sure sounds like its spinning that fast. It's getting the same gas mileage as a full size Bronco about 15mpg.
I stumbled upon the answer in the service manual. I figured it would be in the A4LD section but i was wrong. It was in the Automatic Transmission General Service section. I never thought to look there.
I would have never guessed it was that high but I'm used to V8 trucks. However... that doesn't matter when the TC clutch locks and as far as you can tell it's not locking correct?
As far as I know, your brake light switch is wired to lock / unlock the torque converter at least when it is in over drive. You could get it up to speed and then put your foot on the brake peddle just enough to activate the brake lights to see if it makes a difference.
I replaced the valve body (again). This time with a reman (Sonnax) instead of a “good used” one and I reinstalled my original manual valve. That solved some of the odd shifting issues. It no longer bangs going into reverse and it isn’t so hard finding reverse. With the other manual valve I had to go past reverse toward Park to get it into gear. However, I still didn’t have OD or lockup. I checked the lockup and OD solenoid wires with a multimeter. The computer was never commanding it to do either. I pulled codes and found a VSS code. It appears that sensor has fixed the problem. On the highway, 60mph is about 2500rpm. The odometer only shows 68K miles and the transmission now shifts nice and firm through all gears.
From previous electrical testing the PCM was trying to engage OD and the TCC which is why I had replaced the valve body the first time. I replaced it again because I was going to install the SK shift kit but there was too much scoring on the valves. It would have needed a full rebuild so I got the reman valve body. That’s when I rechecked and found the low input from the VSS code.
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