What do you guys think about this. I just put in a SB 3250 with Hyd, upgrade and love it. I found it easy to shift the truck without the clutch around 1900-2000 rpm. Shifted somewhat smooth with no grinding. Is this good or bad for the truck. I can shift like this even when i'm towing. Thanks for your thoughts.

 

A dual disk clutch is hard on the sycros anyway, not using the clutch just makes it that much harder on them, so I would say use your clutch. It seems alot of guys are starting to have lots of problems with the G56 so I would try and be as nice as possible.

 

i know some of the problems have to do with leaks caused by using fork lifts on uncrated G56's at the factory, and i've seen some problems that seem to be caused by high HP and 37's (or bigger), but have you seen many problems that weren't related to those things?

 

The synchro's basic function is to match engine speed to driveline speed, so if you accomplish that with your right foot instead - no worries.

I think most folks aren't true "drivers" who can shift like that reliably enough to warrant the risk of premature wear or damage, but the G56 does make it easier than most, IMO.

The stock LUK in the '05 has been severely abused, so it frequently locks up the pedal after a hard pull through one gear... it gets shifted with engine RPM for a few minutes after that, and it has always been easy to shift clutchless during easy cruising.

I believe the G56 failures stem from the ease with which it can be speed-shifted, since it allows the engine to carry full-boost power through the gear change (no-lift). If you shift it fast enough, gear re-mesh occurs quickly enough to prevent the drivetrain from being unloaded... as we know, an unloaded driveline + big power = Carnage.
From a mechanical engineering viewpoint, it's a simple question of static vs. dynamic loading.

Practically speaking, a G56 should be shifted normally, or lightning fast; it's the in-between attempts that hurt the hard parts. Grinding (even a tooth or two) under WOT with a BOMBed truck is an excellent way to renew your membership to the "You play, you pay" club.

BTW, the bronze synchros are designed well, and look pretty good even after abuse. The only thing I've found inside the tranny case that I don't like is the strength of the welds that attach the shift forks to the shift rails... great design - occasionally poorly executed (probably on a Monday morning or Friday afternoon) by that Tier 2 vendor.