Samberg cradle with 8.8 diff axle problem?
 

Hi
I get the samberg cradle for 8.8 diff to my rx7 fd3s, I want another way to use the fabrication half shaft, I try to use the cabra half shaft it fit but whe I start in first gear it vibration too much, any help and what the write length for the bar should I use , any way please help but not dss shaft,

Thank you

my car:
Rx7
2jz with r154 tranny
8.8 diff 31 splin
samberg cradle

Thank you