P0705 code and check trans-axle light came on

I have the car listed above LS model, 24V.

Both the engine light and the check trans-axle light came on yesterday. I pulled the code on it and it was a P0705.

So, I figure I would change the transmission range (TR) sensor (also called neutral position switch), not that difficult to replace. However, that did not fix the problem.

Each time I put the car in revers it "bucks" (but it has been doing this for seven to eight years), and when I put it in Drive (D) the Check trans-axle light starts blinking and it still throws the P0705 code.

I checked the transmission fluid and it looks clean, I could add a little, but the level is still in the hash.

The car still drove well after throwing the code, I have not test driven it after changing the TR sensor.

Any ideas on what to check next?

Regards,
Bill.