Is the clunk from drivetrain or IRS bushings?

[Charles236]

The transmission output shaft doesn't have a master spline on it to key into the yoke of the driveshaft. So you can instal the driveshaft into the transmission in any position that the 27 or 31 splines of the output shaft line up in.

 

[98Rsnake]

i just did the maximum motorsports diff busings and my clunk is gone! i had it bad too. it also helped with wheel hop, it just barely hops now.