Depends on the pump. The 215 I had on my 24v would almost never jump. The one on my 12v did it about 60% of the time. I did a couple other trucks and it was a real struggle to get them to not jump, so matter how loosely the gear was fitted on to turn it. That's what made me end up having a tool made to turn the pump without the gear on it.
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'98 3500 2wd, 24v, 5 spd, p-pumped
'98 2500 4wd, 12v, 6 spd, VP'd
'02 VW Jetta, 5 spd.
My p-pump conversion pics
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