Slip? Go-go Solenoid

[loganjj27]

Just got my first 6.4 and must say i love it. Its been deleted. Ny problem is that It slips everytime while shifting into overdrive. But if i put it in tow haul mode it doesn't slip at all. Im debating if it is my tuning causing this or do i need the go go Solenoid.

[DoubleDpsd]

Gogo solenoid is only for 3-5 shift

[loganjj27]

Anybody think it could be my torque converter?

[Rubenk]

What do you mean "slips while shifting into overdrive"?

Does it rev-slam? Does it shift into overdrive then rev up? Does it shift fine if you let off the throttle right when it goes to shift?

I've talked with Brian at BTS a few times when I thought mine was slipping. If your truck will still creep along at idle, then the torque converter is still good. Mine still creeps uphill even. So I'm leaning towards worn clutches that sometimes grab, sometimes dont.

[loganjj27]

It revs up as it changes gears to overdrive. No slam. But when in tow haul i can put it to the floor and it won't skip a beet. Its been at trans shop 3 days now and he is stumped. There hooking pressure gauge to it today. We'll see how it goes.

[Rubenk]

That sounds like the shift flare commonly associated with 3-5.

I dont think its technically a slip, as the trans is in between gears when it does it. Does it hang there for a while or slip once it actually gets into 5th?

[loganjj27]

Got.truck back from shop. Flashing all computers on truck and then putting h&s back on fixed problem. Also went ahead and had go go solenoid installed. Shift to 4th seems a little harsh. They said the torque converter was locking while changing gears or something along the lines of tq