c4 transmission

I have a c4 with a shift kit on a 351w, When driving about 3 blocks it goes into what seem's to be neutral. When I coast to a stop and wait about 2-5 minutes it takes off and runs like nothings wrong for another 2-3 blocks and then neutral again, throught all this I'm still able to use reverse with no problems! Think the trans is going or would a torque converter do this? thanks

Have you checked to make sure its full of fluid? If its to low or filter is loose it can suck air. If convertor is bad it would not move in reverse either

Its full of fluid, In fact its new fluid and filter, Thats the first thing I tryed, Being it came on so fast. It work fine until it warms up. I also put on a new oil cooler. Hate to pull tranny if its something simple. thanks

It's my experience that if the fluid isn't low, then what you say is happening needs a tranny drop and a visit to a good rebuilder or a swap for another one if the rebuild is more than you can afford. Could be an internal crack that as it warms up lets fluid go into other areas and not where it should be pushing pressure. Or maybe worn out disc pack.

Big time bad news. Took trans. out and found torque converter came apart inside and filled trans. with metal fillings ruining everthing. All back together and feels like I have a v-12 instead of a v-8 or maybe it's just because my pocket is alot lighter.