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

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  #1  
Old 03-26-2015, 04:23 AM
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2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

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

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  #2  
Old 03-26-2015, 06:58 AM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

Thanks! I'm going to try to get this applied soon...my shifting still hasn't improved much after 6,000 miles.
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Old 03-26-2015, 06:03 PM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

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??
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Old 04-01-2015, 07:09 AM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

Yeh this is huge, my gear shifts are dreadful. Embarrassing sometimes with guests, but usually just me noticing.


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Old 04-07-2015, 10:28 AM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

Has anyone done the update yet? Any improvements?


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Old 04-07-2015, 11:52 AM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

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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Old 04-07-2015, 11:52 AM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

I had it done last Thursday. I don't see a noticeable difference but I never had major shifting issues. 4000 miles on a 15' SRT, build date 12/2015
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Old 04-07-2015, 11:53 AM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

Quote:
Originally Posted by SRT6.4 View Post
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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And by higher shift points, I mean right to redline...much more get up and go, especially when you're already rolling..,


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Old 04-07-2015, 04:56 PM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

Update - The vehicle feels much faster now, I'm not sure what they put in the update but it's almost feels like an overall tune and not just a TCM update.




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Old 04-07-2015, 06:18 PM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

I'm scheduled to go in 4/9 this Thursday...


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Old 04-07-2015, 07:21 PM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

Quote:
Originally Posted by Jvmorales05 View Post
I'm scheduled to go in 4/9 this Thursday...


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It only took about 20 minutes in total. There's also a recent TPMS module update so make sure to ask them about it while you're there.


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Old 04-08-2015, 10:12 AM
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Re: 2015 Flash: 8HP70 SRT Transmission Shift Enhancements - New TSB 3/25/15

Had mine done yesterday and it solved my "clunking" issue. Hopefully it won't come back.


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