Trans giving me whiplash at stop signs

6408 Views 30 Replies 11 Participants Last post by Lil Hemi, Oct 27, 2019

Lil Hemi

Discussion Starter · Oct 19, 2019

Hey gang, myself n Rocketw19 have been noticing that when we slow down for a stop sign, and don’t make a full stop, sometimes we get a whiplash like reaction from the trans. It’s not always but it happens more than I’m comfortable with. We were thinking it was related to our Livernois 1025 packages with trans tune but I saw this on the FB group. Has anyone else had anything similar with their trans? Tuned or stock? We spoke to another member with the Livernois 975 package n he just loves his trans tune so we are thinking we might have a trans issue that hasn’t fully presented itself yet and these are symptoms of something coming. The FB group is private so links probably won’t work, I attached screenshots. Please chime in if you’ve experienced something similar.

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ThawkMike

· #2 · Oct 19, 2019

There is a TSB that is related to shift quality

http://www.wk2jeeps.com/tsb/tsb_wk2_2101714.pdf

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Toynut

· #3 · Oct 19, 2019

I don’t know if that 5 year old TSB applies to the current TH drivetrain. I have had some unusual “ stalled” down shifts when slowing down for a red light, leading to an occasional semi-abrupt engagement upon light throttle application ( almost like a slip-grab feeling in the drivetrain).
I had a similar shift scenario in my ( then new) 2010 Ecotech MKT. It startled me so much the first time it happened that I checked my rear view mirror to see if I had been rear ended.

I will mention it to the dealer when I bring my vehicle back next week.

Reactions: 1

Lil Hemi

Discussion Starter · #4 · Oct 19, 2019

Plus, Rocket n I have the Livernois transmission tune so if it was software I’d think that would’ve taken care of it but it seems to have caused or greatly exacerbated the symptoms.

ThawkMike

· #5 · Oct 20, 2019

If it’s the same torque converter type slip I think we are all talking about, there is a tsb somewhere for it. That may not be it.

Most seem to be early 2018 models that have the issue.

And per the trans tune, good point, but I don’t believe they re-write the entire tuning, they just modify it. If the issues is not modified, it’ll still be present, and maybe amplified from the other changes.

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Reactions: 1

dragpac

· #6 · Oct 20, 2019

You should have left it stock.

Lil Hemi

Discussion Starter · #7 · Oct 20, 2019

What’s that? Sorry, can’t hear you from way up here. Have a good look at my exhaust tips while ur back there though 👍🏻

Reactions: 3

dragpac

· #8 · Oct 21, 2019

Bring it !

Lil Hemi

Discussion Starter · #9 · Oct 21, 2019

That’s twice you’ve said I should’ve left it stock. Do you know something I don’t? You have ESP? A Palm reader? Good old fashioned carny Gypsy? Maybe you work for the NSA? CIA? MIB?? CVS?

Whatever the case, share your info if you can.

scottiekay1973

· #10 · Oct 21, 2019

I have had no issues with trans jumping like you describe. Im running on the stock trans tune and I have the same package you have. Lil Hemi, what does your boost max out at now with your set up?

Lil Hemi

Discussion Starter · #11 · Oct 21, 2019

Idk, I haven’t really looked at that much. I’ll have to give it a look next time I go WOT n report back. At a glance it looks close to 20 on the chart.

scottiekay1973

· #12 · Oct 21, 2019

My tuner said my boost max hit 19. They thought that was a lot. The power with the upper and lower pulley being changed is super significant from when I only did the lower. Its like scary now the difference.

Lil Hemi

Discussion Starter · #13 · Oct 21, 2019

Yeah, it’s good fun for sure. I put on spacer plates too, sposed to help boost a tad. The SC gaskets can be a cause of lost boost, it sure looked dirty to me when there should only be air in that area when I did mine. U on E85 too?

scottiekay1973

· #14 · Oct 21, 2019

im the one that did meth.. see my instagram for the install. scott_kaz73 -- truck runs real strong. Meth was set to spray at 8psi all the way into max boost. I dont know that I will ever want to sell this truck, I dont believe I will ever have another vehicle more fun then this one.

Lil Hemi

Discussion Starter · #15 · Oct 21, 2019

Oh yeah, I remember now. No corn is ur zone. I’m with u man, this truck is stupid fun. My first boosted V8 and I’m not missing turbo lag at all. Have to completely change my driving style when I switch over to the car.
How’s that meth working out for ya?

ROCKETW19

· #16 · Oct 21, 2019

Lil Hemi said:
Idk, I haven’t really looked at that much. I’ll have to give it a look next time I go WOT n report back. At a glance it looks close to 20 on the chart.

yup I never looked either but I do think Ive seen 20.
I dont know whats its supposed to be so I dont pay attention to it,lol.

what are you intake temps at now with the spacers? do you remember before and after?

LivernoisMotorsports

· #17 · Oct 23, 2019

the transmission calibration doesn't adjust any coast down (off throttle) downshifts and they are 100% stock as negative torque situations rarely need adjustments from stock unless you're changing friction materials.

I am guessing here, but does this primarily act up in auto or sport mode? I am guessing the problem nearly goes away in track mode if not completely.

Lil Hemi

Discussion Starter · #18 · Oct 23, 2019

In my case it is much, much more pronounced in track mode but these aren’t track like conditions, just gentle driving while in track mode.

Reactions: 1

Rez90

· #19 · Oct 23, 2019

at what point of mods do you need a trans tune to keep things safe?

or is the trans tune simply for faster shifts?

scottiekay1973

· #20 · Oct 23, 2019

Lil Hemi said:
Oh yeah, I remember now. No corn is ur zone. I’m with u man, this truck is stupid fun. My first boosted V8 and I’m not missing turbo lag at all. Have to completely change my driving style when I switch over to the car.
How’s that meth working out for ya?

So far so good with the meth, no drivability issues at all, no check engine lights. Where I notice the difference really is now that I added the 2.85 pulley to accompany the lower metco pulley.. that upper is a game changer. I should have done that first from the get go. I still have not gone super hard on this truck since switching to the new set up. The weather has sucked in massachusetts rain and colder. Plus, I am a still trying to get used to the new power it delivers now, the power points are very different. Its night and day.

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