[nkmhockey]

So, I do have the correct wiring harness? It is the round, six wire connector?

I have definitely found that the correct solution is a full rebuild, which would probably run at least $2,000 around my area. Such an expensive repair is not an option – the car is barely worth that much (according to KBB). But, since everything else in the car is perfect and the transmission appears to be undamaged, besides the TCC slipping; adding a TCC lockout switch is the perfect solution. Minimal cost, minimal labor, but maximum results (no fishbite).

Maxwedge – I have already determined that the TCC is the cause of my drivability issues. I am receiving DTC P1870 which directly mentions the TCC. The TPS, both O2 sensors, and plugs/wires have already been replaced.

The “fishbite” I experience occurs regardless of outdoor temperatures, but tends to worsen in extreme hot and extreme cold. The problem actually worsens (more noticeable, frequent) in the summer and winter months. If I installed the switch, chances are high that I would have to leave the TCC locked out for 100% of my driving time.

Is there any risk of damage by leaving the TCC locked out under all conditions?

I am thinking no – the recent cooling system work and transmission fluid changes should ensure the transmission never overheats. I am currently using Dexron VI, even though only Dexron III is necessary. From what I understand, the improvements in Dexron VI (full synthetic) should prevent the transmission from ever getting hot enough to cause damage – even under extreme driving conditions.

I have considered using Seafoam TransTune – would that make any difference? I have done 2 flushes/filter changes in the past 6 months. If I do add TransTune, I would be hesitant to do another flush/filter change because the Dexron VI that is currently being used was extremely expensive (~$6.50/quart).

Any suggestions? Thank you both for the help so far!