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2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

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2015 srt
12K views 42 replies 17 participants last post by  tones_SRT 
#1 ·
NUMBER: 21-018-15
GROUP: Transmission and Transfer Case
DATE: March 25, 2015

SUBJECT: Flash: 8HP70 SRT Transmission Shift Enhancements

OVERVIEW: This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software

NOTE: This bulletin applies to 2015 model year SRT vehicles built on or before March 3, 2015.

SUPERSEDES SERVICE BULLETIN 21-038-14, DATED NOVEMBER 25, 2014

http://www.wk2jeeps.com/tsb/tsb_wk2_2101815.pdf

-Milous
 
#3 ·
The only thing that makes me nervous is whether or not the person doing the updating is competent enough to make sure it is done properly.

Hopefully this the last update that is needed. I see that there have been several over the months. Why is this? Does the transmission need constant updating? That shouldn't be the case, right?? :confused:
 
#6 ·
I just did the update at the dealership...interesting and noticeable changes...good and bad:

Good - At kickdown the transmission rapidly downshifts in the lowest gear - much faster than before the update.

Bad/interesting - at highway speeds it stays in 8th gear unless you floor it or rapidly brake. Just letting your foot off the pedal completely doesn't make it downshift as it did before the update, which I actually liked better before, but we'll see.

I also noticed the shift points seem a bit higher which makes the truck a bit quicker...


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#20 ·
I'm getting another billet silver one, but have only found two. One doesn't have the tow package and the other is sitting on my original dealers lot. I don't want it for a couple of reasons.

1. It's on my original dealers lot.

2. The fit of the rear bumper cover to the quarter panels and fender flares is awful. I actually took a picture of the window sticker to make sure I don't get stuck with that one.

I'm wondering when the ordering stops for 15's.


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#24 ·
Mine got the update done today but I won't get the vehicle back for another few days. :(

They're working on a few other issues I brought it in for as well. Looking forward to an improvement in shifting/downshifting!
 
#25 ·
Picked mine up today. Oddly it's a very noticeable difference in a good way. I remember looking at the gear number thinkin it looked funny, now it looks great as I'm driving. Rev and it lowers then settling in high speeds it remains high but as u speed up lowers again. Before just seem to rev to high to quick and not lower quick enough. Also mpg looks more favorable as I drive. I'm happy with it.


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#26 ·
I'm dropping mine off in the morning for the newest PCM flash...we'll see if it helps the 1-2 slip issue the first shift of the day, along with a 4-5 slip in Sport and 6-5 "hard lurch" in Auto.
 
#27 ·
Any update bmrisko? Which dealer did you get it done at? Champion?
 
#28 · (Edited)
I had mine done at Landers and it was actually a pretty nice experience. Kevin Russell has been my service adviser/main point of contact and the few times I've dealt with him he has been straight forward and gotten things done exactly as I asked. I'd definitely speak with him if you can. He also waited until I got there to pick it up to ask if I wanted it run through their car wash, which I did not. He said he knows most of the SRT guys hand wash, so he wanted to ask before doing anything.

In addition to the transmission flash, they also did the TPMS update and finally got my steering wheel centered. I can definitely tell a difference with the transmission flash, in a good way. I'm interested to see how the week goes as it re-learns. Not sure how best to describe it, but the auto now has some more of the Sport shifting characteristics, without being too sporty.
 
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#31 · (Edited)
Update: i had this completed this morning and as mentioned by others, the vehicle performs markedly different in a good way. Shifts are smoother, more responsive and seemingly more in line for how this vehicle should have been delivered from the factory. I also no longer get the 8th gear groan and MDS lag when accelerating. 6-5 downshift is also noticeably smoother.

So far very pleased. Hopefully it continues to perform like this.
 
#32 ·
Just had this done this morning. Shifts feel smoother under light throttle. Down shifts aren't nearly as rough. Prior to this on occasion the 6-5 downshift and 3-2 downshift felt like I was deploying a parachute. More often under moderate throttle and quick deceleration. That seems to have diminished. Wot feels a touch smoother too. Gets up and goes and seems to be in the correct gear. Auto mode also feels a touch more peppy. So far 40 miles on her since the flash. Keep you posted. 4900 miles 2015 srt jeep
 
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