My shift indicator lights (green) constantly blink
Could this be a transmission issue, as my Lincoln LS 2000 has 90K on it, it is a 5-speed, and I love the car, but its cost me $4K in work in 8 months...
Is there a fuse I can pull and stop that blinkinv
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if it is a manual transmission then broken mounts are always a good place to start looking
next is a clutch problem nor disengaging properly--again a mount problem
if it is an auto the the mount is immaterial as it will be a selector sensor problem
Your on the right track. Have you scanned the PCM, what codes did you get? If not and you changed the vehicle speed sensor,(VSS) did you check the (OSS) output shaft speed sensor, it will cause torque converter lock up and hard shifting and that pesky OD light flashing. I have also found that clutch packs inside auto tranny's dry out. Ford and some aftermarket companies sell a fluid that will recondition the clutch packs.
Since you mention 30mph a speed when the transmission wouild normally shift into 3rd, and again at high speed (you didnt' mention MPH) where it would possibly shift again, it's possible that the transmission is slipping. Check the fluid or better yet, if it's got around 50-60K on it, have the fluid and filter changed.
Another cause could very well be fuel related, be it a filter, fuel sending unit, or the pump itself
I'd start with the transmission fluid. Check it and if the color is starting to brown, or gives a slight burning smell, have it changed along with the filter. If it's just low, then that definitely would cause the transmission to slip.
Best of luck and post back with any other concerns.