ok guys guys i need some help. I run the car for about 5 min and after that on jumps it starts to cog and it really throws me off. I changed the diff, tranny is mint, cvds dont bind. changed pinion and spur. I used 3 different batteries and a new sensor cable along with a moter. The one thing i didnt change is the speedo. I am ganna throw this lrp in the garbage if its the speedo.

HElp!!