I have a C6 manual reverse valve body that is reliable and has always run cool. After the last rebuild from a reputable transmission shop, it developed a hesitation between 1st and 2nd. After a few races, I sent it out to another top builder and I still have the hesitation. On the jack stands at 3,000 rpms the wheels will slam to a stop for about 3 seconds before spinning again. 2nd to 3rd is quick and responsive. Any ideas or suggestions are appreciated!