Re: ZF6 ?
Mine rattles quite a bit more now in neutral (with the DD) than it did stock. I've tried a couple of different kinds of lube in it, but it still makes noise (haven't tried and gear lube though).
Also, it used to "growl" on take-off in 1st or 2nd gear, from right below idle to about 800 rpm. Now it's gone in 1st & 2nd, but it's got the growl in other gears, 3rd & 4th...and at a higher engine/road speeds(12-1500 rpm).
Other than that, it's working great! At least it isn't slipping with a load on it!
Al in SoCal
AFE Intake; Garrett 38R; Turbine Jacket; Banks IC, BanksBrake
Melling LPOP, External Oil Cooler & Filter System
Stealth 4-line Twin HPOP,
Swamps 160/30's, HVHF IDM; DP-Tuner F5
Full R-R Fuel System, Pre-& Post-pump filtration
Mishimoto Rad & Tank; 4" Exhaust, Twin Aussie Stacks
SouthBend D-D Clutch; ZF 6-spd, GearVendors O/U Drive