I’m curious which ‘kit’ you’re referring to. I’m not aware that Sonnax do a kit for the 5HP24. Do you mean the ZF 5HP24VBK valve body kit?



I would certainly first check all valves for delamination of the anodised spool surfaces



The two main wear areas are the main pressure valve and, to a lesser extent, the lubrication valve and Sonnax do an oversized replacement just for these two valves for the 5HP24.





For the main pressure valve I would concentrate on the vacuum readings from these three worm tracks :





I’d be interested to see the vacuum test result you get from the TransGo valve as I’m personally not convinced about its sealing capability





Phil