[Sunliner]

As a couple of you know, I have a '97 Blazer with the fairly common problem where it shifts hard from 1st-2nd when hot. Can turn the ignition off for a few seconds & will be ok for a while. Almost always sets a code 1870. Drives beautifully around town.

Ok...I changed the ignition switch thinking that might be the culprit, but no dice, still have the problem.
I think the next thing is to go ahead & get the Sonnax TCC apply valve kit installed on the valve body, as that seems to be the most common fix for this problem from what I've read/heard.

So far, I've called 4 transmission places and all will do this fairly reasonably. One shop though, insisted that I need to replace the torque converter as well, which will push the total bill up to about $550.00

Now...from my limited understanding, this *could* be a good idea since the 1870 is a component slipping code, but everybody else I've talked to said that theirs was resolved just by doing the TCC apply valve fix (and in one case, I think they also did a PWM sensor, but that's pretty inexpensive.)

My transmission fluid is nice and pink, doesn't smell burnt and my last excursion into the tranny pan ( a few weeks ago) revealed no large pieces of shrapnel or anything that looked like clutch material etc.

With that in mind, I'm wondering if I should replace the torque converter too, or just the TCC kit?
-Mike