It's sort of the nature of the beast. I've noticed that the 6.7 feels more like a light switch than an accelerator. My old Duramax wasn't that bad. Watch the tire wear at the right rear corner. I know for a fact that I never spun the tires but right rear is worn at least 30% more than the other 3. I like the locking rear diff, if I were stuck in the mud, but the open rear diff is hell on tires (or tire!lol). Give and take
I know about the tire issue. There's even a bulletin from Ford on the subject.
No resolution though other than back off the skinny pedal.
I have the elocker too. Useless if you ask me. That kind of thing is ok for severe duty off-road, but who takes a $62k truck 'wheelin? IMHO Ford's elocker rear diff is useless. Fact is that due to the programming, anything over 35mph it's off anyway. Coming from RC racing, I can say for sure that a spool in the rear is the best way to make a truck handle like crap anyway - makes the rear end very loose, so I can see why Ford turns it off at any kind of speed.
For those that don't know how an elocker works: It's an open differential unless an electrical current is sent to the diff. Then it locks both wheels together = spool. The electrical current comes from a decision the computer makes based on your speed (must be below 35mph) and whatever traction and stability control are deciding. Far as I know it's all decided by the computer. If there's a switch to do this manually, I haven't seen it yet.
No matter what, an elocker is the worst of both worlds.
*open diff most of the time
*spool when locked will cause the rear end of the truck to be very 'loose' and the looser the terrain (like a very dusty dirt road) the worse the truck will handle - rear end will be all over the place
*spools cause severe crab walking which my truck suffers from something terrible. 4low and slow the whole rear end is bouncing around when making a turn (most likely axle wrap due to the tall blocks in the 350.)
*not that it really matters because Ford is not allowing you to control it anyway.
Ford should have offered a Limited Slip in the rear (they do for dualies, but not for SRW), and an elocker up front. For a truck that spends most of it's life on the road a LS is far more useful than a locker. I'll bet 99% of the customers would benefit from a LS.
A Truetrac is on order, should ship any day now. And I'm putting the detroit eLocker up front for that emergency off-road need (will probably never use the thing.)
Sorry for the sidebar. Back on topic. So, y'all think a tuner will help with throttle response huh? I have to wait until I'm sure the truck isn't one of those that suffer from severe mechanical failures first. I may put a tuner on soon, but only in monitor mode. Going to wait until at least 10k before tuning it. Plan is H&S w/ KEM. Just turned 3k today.