Just deleted and tuned

**Ehennek** · 03-12-2019

Hey all! Just deleted my 14' added a 4" FLO-PRO and accidentally put it on level 5 (150-200+ HP) was actually not meaning to do that. and had some fun to test out my new MM3 tuner from DRD. Trans is now slipping into 3RD and 4TH. It shifts kinda hard into 1st and 2nd but that was occurring before the delete. Gears after. 3rd and 4th are fine. Pulls nicely on the highway. I've tried it going slow into the throttle and heavy and it does the same. So my question is should I just check the fluid and possibly change it it/ replace filter or am I on the wrong side of a possibly rebuild? Also could it be something as cheap as a new converter and valve body? (Would go aftermarket obviously) I say cheap because compared to a new transmission it's cheaper obviously. But any advice would be greatly appreciated! Thank you

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**smartdave** · 03-12-2019

Did this happen right after you tuned? These are learning transmissions. And they do act a little soft until learned.

Check your fluids and see if it is burnt. And be easy for a couple hundred miles

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**Ehennek** · 03-12-2019

Yes as far as I can remember it was right after the tune. I drove it a little harder than I probably should have an I'm worried that in that short time, I damaged something. I drove easy for about 500 miles afterwards ( highway miles) as soon as I get off work I will check the fluid level

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**TexNeck** · 03-12-2019

Like mentioned before these transmission are a bit funky during the first few hundred miles of learning. There will be shift flare which is often thought of as slipping when changing gears.

if you can pull up the transmission status on your MM3- I forget the exact parameter but 8 is unlocked converter, 4 is semi, 2 is fully locked. This will give you a better understanding of what’s happening

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**Aj Grubb** · 03-12-2019

Installing a new tune, putting it on the highest power level and immediately driving aggressively is just about the worst thing you could have done to your transmission.

If you are having problems with the 3-4 shift but the 4-5 shift is fine then I assume you are accustomed to normal shift flare and that is not what you are describing here. I doubt that it is a problem with the torque converter because that would be more apparent in the higher gears than it is in the lower gears. Doesn't sound like a valve body issue either.

I fear that damage has been done to the clutch packs. But its possible that it will start do drive better as the transmission has time to learn if there is still any healthy clutch material left.

I would put the truck on the lowest power setting and drive around gently/ normally for a couple weeks and see what happens. If the problem doesn't get better you may be looking at a complete rebuild.

Can you make and post a video of the problem occurring?

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**cumminsdieselfreak** · 03-12-2019

x2 on above comment about this being about the worst thing you could have done. A lot depends on the health of the transmission before tuning but if you've already drove 500 easy miles for it to relearn then i'd say your clutch packs or something else is toast.

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**Ehennek** · 03-12-2019

Originally Posted by Aj Grubb

Installing a new tune, putting it on the highest power level and immediately driving aggressively is just about the worst thing you could have done to your transmission.

If you are having problems with the 3-4 shift but the 4-5 shift is fine then I assume you are accustomed to normal shift flare and that is not what you are describing here. I doubt that it is a problem with the torque converter because that would be more apparent in the higher gears than it is in the lower gears. Doesn't sound like a valve body issue either.

I fear that damage has been done to the clutch packs. But its possible that it will start do drive better as the transmission has time to learn if there is still any healthy clutch material left.

I would put the truck on the lowest power setting and drive around gently/ normally for a couple weeks and see what happens. If the problem doesn't get better you may be looking at a complete rebuild.

Can you make and post a video of the problem occurring?

I completely agree and like I said it was a total accident. I was still learning the tuner and didn't know wtf I was doing until I had already done it. Totally my bad but unintentional. I've kept it on stock tune ever since so I don't make anything worse until I get it figured out. I will post a video soon if I can figure out how to do that haha.

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