Like I said before and someone else mentioned it before, my S6 650 (and his) shift really smooth, so you must have gotten a bad one. And I have to admit that my clutch linkage and all that is totally different anyways since I jused the duramax hydraulics with the OEM 78 clutch pedal with a home turned and welded mount. so my clutch pedal has about half the throw of the stock one. Takes a little to get used to, but makes for really fast shifts. And together with the 6.2 L92, it makes for a fun and fast combination. The ZF in my truck the way it is set up actually has relatively short throws for a truck tranny and also I think it shifts really nice. You really must have gotten a bad example.
I even think I have an on bord video from a stand still shifting through the gears..that shows how nice it does shift...
Quote:
Originally Posted by DirtyLarry
Wow, a S6-650 behind a 6.2L must be like driving a race car engine backed by a dump truck transmission 
Glad you like yours….you could have the ZF S6-650 in my 2001 2500HD. I hate the damn thing. Worst shifting manual trans I’ve ever owned with an even worse shift pattern. I’ve own that truck since new and 13 years later it has finally started to loosen up where it isn’t quite as notchy as it was up to this point (It just turned 59,000 miles last week) but I still hate it. The clutch pedal geometry on the GMT900 trucks is also quite funky. There is no slip to it, it works like an on/off switch where it is almost impossible to launch the truck smoothly. Between the clutch operation and the awkward shifting ZF 6 speed is why it has only racked up 59K in 13 years. I don’t like to drive it much.
I still prefer a NV4500 over the ZF any day, but there is no doubt about it the ZF is a much stronger transmission by a long shot. |