Greetings,

Vehicle info:
220500miles
2005 Tacoma PreRunner Double Cab 2WD 4.0L V-6
Transmission A750E (5 Speed Automatic)

Issue:  Truck is experiencing the shutter or “rumble strip” effect between 30 and 40 miles per hour.  If I pay attention I can accelerate through the condition and it’s not so noticeable. I’ve had a local shop look into it and they state it’s an issue with the torque converter. A known issue.  I was able temporarily relieve the condition by doing a transmission filter and fluid change. Lasted about 7k miles.  Condition seems to be getting worse though and there is a concern I’m just compounding the issue by limping it along. Money is beyond tight at my household but may have some wiggle room. 

My questions are:

1. Should I continue changing the transmission fluid every 4 to 6 months until failure?

2. Should I look into a lower mileage used transmission/torque converter or remanufactured transmission/torque converter?

3. Who would be a good go to facility to obtain parts. Related to questions 2. Also, who in the Houston or Texas can I trust to give me a good honest evaluation and possible work?

Appreciate any help or advice.  Been researching issue on TacoWorld too.  

All the Best,

Kevin S.