603 87sdl b2 piston?
 

I think it's a faulty B2 that is causing my shifting issues, but wanted to see if anyone else has "invented this wheel" before.
The tranny has trouble shifting between 2nd and 3rd...It flares and sometimes just revs when trying to shift. I had the k1 spring done about 1 month ago. Car has 250k on it and seems to have been well maintained by prior owners.

Thanks,

Jason

Is your Transmission shifting into First Gear OK?

It was into first OK. 2nd to 3rd seems to be the only issue.

It gets worse when car is warm. Probably not the B2 as there is not an issue with taking off in 1st or 2nd. I may try some tran x or have my mechanic clean the valve body.

Yes, it does not seem to match the symptoms of a Broken B2 Pistion. Also, I think your Car most likely came from the Factory with the updaded B2 Piston and Bushing. But, I am not sure about that.