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The symptoms are somewhat odd given how the transmission is designed (see below).
For 1, 2, 3 to work requires that the front 2-speed gear box actuator is functioning and that the middle 3-speed gear box is shifting between 3.25:1 and 1.53:1. If the 3-speed can't switch to gear-3 but remains stuck in gear-2 (1.53:1) then D4 will be 3rd but D5 should shift to an unused gear ratio of 1.1475:1 which would be noticably faster than D4.
Reverse is a third gear box at the end with its own actuator which doesn't seem to be functioning.
It may be that the actuator pump isn't generating enough pressure to operate the 3-speed gear box fully (it can switch between gear-1 and gear-2 but not to gear-3) or to operate the reverse actuator.
Transmission description by the design engineer from an old forum page:
#604 of 677: LS *is* a 5 speed transmission (mkovalsk) Tue 28 Dec '99 (05:58 AM)
The LS is a 5 speed transmission. It is in thesame "family" as the Explorer 5 speed. The new transmission, called the 5R55N, was designed from the Explorer trans, but 95% of the parts are new.
The torque converter only locks in 4th and 5th, except with the sport package. In the sport it can also lock in 3rd gear when shifting manually.
Second gear is not achieved by locking the torque converter in first gear. It is achieved by overdriving first gear. Fifth gear is not created by locking the torque converter in fourth gear. It is overdriven fourth gear.
Think of this as two transmissions in one case. In front is a two speed trans, with ratios of 1:1 and 0.75:1. This is called the overdrive unit. Behind this is a three speed transmission.
In first gear the overdrive unit is at 1:1 ratio. The rear gearset is at 3.25:1. This gives an overall ratio of 3.25:1.
For second gear, the overdrive shifts to 0.75:1 and the rear unit stays at 3.25:1. 3.25*0.75 = 2.44:1.
For third gear the overdrive shifts back to 1:1 and the rear gearset shifts to 1.53:1. 1*1.53=1.53, which is the third gear ratio.
For fourth gear, the rear set shifts to 1:1 ratio, and the front stays at 1:1.
For fifth, the overdrive shifts to 0.75:1 and the rear stays at 1:1.. 0.75*1=0.75, which is fifth, or overdrive ratio.
I don't know what else to call this besides a five speed. There are five distinct ratios, plus converter lock.
It's called a manual. It was 48 years or so between the '51 and '00 Lincolns that had manual transmissions. I'm guessing it'll be at least 48 before there's another one.
I've let dozens/hundreds of these go by.
Once it's rebuilt, have the fluid changed out (completely, with an exchange machine) every 50-60K miles.
Thanks for your time
Ps. Now if the car is in neutral and I let out the clutch it will just stalls. It only wants to go into reverse and 1st gear .
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