SPARTAN 210 Tow Performance, transmission lapse as if N shifted to D?

[Lone Ranger]

In normal driving, as you coast up to a turn while still rolling, once in a while my 09 F-450 seems to be in stuck in nuetral and clunks into gear at a higher rpm when I push on the accelerator to go again.

It is as if I coasted up to a turn in N and with the engine reving a little I put it back into Drive. It is only a bit of a nuisance, not too hard of shift clunk, just annoying. Does anyone else experience this?

Is it just part of the Spartan affect somehow or can I adjust it?

[08stroker250]

Drive the truck hard a few times through the gears. Also try adding a little extra fluid to the tranny, like 1/2 a quart at most.

[Larietguy10]

Originally Posted by Lone Ranger

In normal driving, as you coast up to a turn while still rolling, once in a while my 09 F-450 seems to be in stuck in nuetral and clunks into gear at a higher rpm when I push on the accelerator to go again.

It is as if I coasted up to a turn in N and with the engine reving a little I put it back into Drive. It is only a bit of a nuisance, not too hard of shift clunk, just annoying. Does anyone else experience this?

Is it just part of the Spartan affect somehow or can I adjust it?

Mine did the same thing. All I did to fix it was added a 1/2 quart of ATF and that clunking went away. Not sure why, but it worked.

[AED F250]

A friends truck does the same thing with the normal 210 tune. I guess I'll have him add some trans fluid and see what happens!

[sjl2725]

Yeah, since I got Spartanized, mine's been doing all kinds of weird $hit. Especially since I went from the 210 to 250. I noticed the same slop when coasting; like if the drive belt on my harley is too loose.

[08stroker250]

Doing a tranny relearn when you first load up the tunes and hammering on it through the gears every once in awhile will help prevent the sloppy shifts.

[sjl2725]

Is ATF-4 ok to use? Its Mopar brand, had it for my Durango.

[08stroker250]

I always recommend using Motorcraft fluids.

[XPLOSIV]

There have been a few posts going over this very same topic over the last few months. At first people were thinking it was just tuned trucks, but a few have report having it happen on stock trucks also. Definately do the relearn any time you load a new tune (for the Spartan trucks)(not sure if the other tuners recommend it) and add tranny fluid if it needs it. Corrected the problem for a few of the guys.