RPM surge ?

[MercedesTech]

First thing I thought too, but it doesn't seem to be the tunes at all. I have run my 87 econ tune, and my 91 tow tune, along with stock tunes, nothing changes.

Yes, the little bounce was with OD locked out. Its pretty much how I drive my truck right now, jump in a turn OD off. There is a little bounce, but I didn't write those numbers down, so I will have to double check. You don't feel it like you do in 4th, thats for sure. I will get more numbers tonight, or tomorrow.

I think its something with the trans, but really not sure. Next step, is to undo the gotts mod. Not sure if I mentioned it already, but right before this starting happening, I did the gotts mod and a drop in K&N filter. I doubt this is the cause, but will take seconds to "undo" and test out.

Thanks for the help guys, keep the ideas coming !

[MercedesTech]

update:

Trans is TOAST !! Gone !

Today driving to work, it was acting up more then usualy. Slipping more then I have ever felt. While driving back from a parts run, it slipped into nuetral, RPMS SHOT through the roof, and after that, only able to run in 1st gear, with some god awful noise. Reverse kinda work, but again, go awful noise.

Only code I got before this happened were:

P2106 Thottle Actuator Control System

P0720 Output Shaft Speed Sensor Circuit.

Looks like I am in the market for a new trans. Any aftermarket, beefy suggestions ????

Thanks for all the help leading up to this guys.

Oh, and trans fluid is clean as a whistle !


- James

[Jackpine]

Not much help, were we, James? Boy, I'm sorry for this to happen to you.

Anytime I hear about transmission problems, I get all nervous. Back in the 50's and early 60's, if you killed a transmission, you were best off just getting a new vehicle. No repair seemed to make it right. I thought finally we were getting to an era of more reliable transmissions. Maybe not?

I still wish my truck had a manual shift!

- Jack

[JWBFX4]

Wow man that sucks Hope you can get your ride back on the road soon.

[88Racing]

Wow! That bites!

Sounds like something mechanical broke inside?
Pump?
If the fluid was clean the clutch bands should still be good.
You could go new and get the mfg warranty but $$$$
Or a reman with slightly less warranty.

Or tear it down and get it rebuilt with beefy parts.

Of the 3 I have had the best luck with the brand new one. You could also find a performance tranny shop and see what they have to offer?

Lars

PS Pull the pan to see what's in the bottom

[MercedesTech]

Thanks guys. And don't worry, truck should be back up and running by late next week at the latest.

Haven't pulled it out, or done anything to it yet. Plan to start looking into the trans today. I will letcha all know if I find anything. Might be staying late and burning some of that midnight oil. Hopefully I still have some laying around somewhere !

For a replacement, I am looking into a reman right now. Problem with brand new is, Ford has a long list of "suggested upgrades" for these trans, but they wont do the upgrade. So I would be replacing it with the same problematic trans. Jasper Trans are reman, come with a 3 year, 100k warranty. Kinda nice. We also have our shop's trans guy. He wants to trade me for a reman thats been beefed up with Ford's "suggested improvements" or whatever. Anyone else know of any place to source upgraded internals ? I don't mind dropping $$$, if I get a bullet proof trans in return (if there is such a thing ! )

Almost tempted to pull everything and go all new drivetrain. Looked into it, to stay legal I have to find an engine from an 04 or newer. Boy would that be nice ! Not likely, but......

[MercedesTech]

OK, called the extended warranty insurance company. They want me to do a full tear down of the trans to source the issue. WASTE OF TIME !!!!

I deal with Mercedes extended warranties weekly, all diffrent insurance companies, never once had to do a tear down. Its simply R&R now a days. Kinda sucks and is going to suck plenty of time out of my weekend. Books gives me 11.5 hours for tear down. Should have it done by 6 hours or so. I better !

Looks like I am going with a Monster Trans. The SS Mega monster trans version. Rated for 600HP. Figure it'll hold with my little motor. Any opinions on this Bill ? Or anyone ?