545RFE, harsh 2 to 3 upshift fix?

Yeti · **Posted:** Wed Apr 30, 2014 1:03 pm

I hope too

Yeti · **Posted:** Wed Apr 30, 2014 3:21 pm

waiting to see if it works, I use a trick when I go down hill , block second gear, and before putting in Drive I increase the speed to 28-31 mph, pull up the foot off the gas and i put D when the revs drop to a minimum, so it does not shift rough

racertracer · **Posted:** Wed Apr 30, 2014 4:43 pm

Guys, the dealer had my tranny apart last summer and they worked on it for 8 weeks to replace the TC.

When I finally got it back, I had a second F37 sticker under the hood with a new revision number, side by side to the old F37 Sticker.

They updated the ECU and TCM.

Now, I don't want to jinx myself but the hard 2 to 3 shift I felt is gone.

My only problem is that the new TC is a bit weak for the Hot Tune, but the shifting is flawless.

Within those 8 weeks they replaced 2 TC and finally replaced the whole tranny with a remanufactured one.

lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

racertracer wrote:

Guys, the dealer had my tranny apart last summer and they worked on it for 8 weeks to replace the TC.

When I finally got it back, I had a second F37 sticker under the hood with a new revision number, side by side to the old F37 Sticker.

They updated the ECU and TCM.

Now, I don't want to jinx myself but the hard 2 to 3 shift I felt is gone.

My only problem is that the new TC is a bit weak for the Hot Tune, but the shifting is flawless.

Within those 8 weeks they replaced 2 TC and finally replaced the whole tranny with a remanufactured one.

Was the rough shifting gone in the interim period between the initial work (which it appears they updated the TCM and ECU programming) and the installation of the reman tranny?

racertracer · **Posted:** Wed Apr 30, 2014 6:39 pm

It was in the shop for the full 2 months

Yeti · **Posted:** Thu May 01, 2014 8:04 am

racertracer wrote:

Guys, the dealer had my tranny apart last summer and they worked on it for 8 weeks to replace the TC.

When I finally got it back, I had a second F37 sticker under the hood with a new revision number, side by side to the old F37 Sticker.

They updated the ECU and TCM.

Now, I don't want to jinx myself but the hard 2 to 3 shift I felt is gone.

My only problem is that the new TC is a bit weak for the Hot Tune, but the shifting is flawless.

Within those 8 weeks they replaced 2 TC and finally replaced the whole tranny with a remanufactured one.

I'm really curios to see what they have changed in ECU .........if done

Yeti · **Posted:** Thu May 01, 2014 11:35 am

test started, I reprogrammed the ECU and did a first round and a cold engine gave no problems, but I have to wait a few km and run tests to verify

racertracer · **Posted:** Thu May 01, 2014 11:59 am

Yeti.

I would send you the Original ECM that the dealer reprogrammed, since I have a separate Hot Tuned unit in the CRD now that came out of my previously totaled CRD before it went to the scrap yard.

But since it is still shifting flawlessly even with the Hot Tune ECM in it, I would think that it is not due to the ECM reprogramming but to what ever was done to the tranny and TCM.

I need The TCM though, I can't send that, I need the vehicle.

Yeti · **Posted:** Thu May 01, 2014 1:54 pm

I'm really curios in ECU flash that Chrysler do

racertracer · **Posted:** Thu May 01, 2014 3:05 pm

Yeti wrote:

I'm really curios in ECU flash that Chrysler do

Anch'io!

Yeti · **Posted:** Thu May 01, 2014 3:28 pm

racertracer wrote:

Yeti wrote:

I'm really curios in ECU flash that Chrysler do

Anch'io!

truckbouy2 · **Posted:** Fri May 02, 2014 4:53 pm

"Hi guys , I have the same problem , but i think I have found the problem ........or best ......the solution , In a engine ECU there are a map that determine the torque in a low and high load on the gear , in the next few day I'll try to tune the map lowering the torque on low load at low rpm , and I let you know if this work"

Yeti, that is just oustanding as it gets :BANANA:

The happy banana dance is as corny as it gets for an old man, but I'm doing right now.

Yeti · **Posted:** Sat May 03, 2014 4:20 am

Second cold start, there is still a little bit, but it's much better, I tried to recreate the condition that leads to a rough shift , turning off the OD, and the engagement is barely noticeable in 3rd, I need to know exactly what rpm puts the 3rd in your, in my is at 1600 rpm in order to concentrate on those rpm , sometimes puts his 3rd in 1200-1400 rpm , but will not be rushing shots, tell me yours, before singing victory I want to be sure

Yeti · **Posted:** Sat May 03, 2014 5:51 am

now i have lowered the torque a little bit at low load from 800 rpm to 1600 rpm , but I think is possible to do the same thing , working on the gas pedal map , lowering the torque requested at low load ..........if I can , I'll try the two different tune for see what is best

Auberon · **Posted:** Sat May 03, 2014 9:36 am

Deleted by Auberon

truckbouy2 · **Posted:** Sun May 04, 2014 11:22 am

Drove the Pricess's Jeep yesterday. 1600 rpm, 2nd to 3rd shift at light throttle, hard every time. Firm to heavy throttle 2200+rpm higher on the shift, smooth every time. There is no hard downshift at all. Same if overdrive is locked out or not.

Yeti · **Posted:** Sun May 04, 2014 12:29 pm

truckbouy2 wrote:

Drove the Pricess's Jeep yesterday. 1600 rpm, 2nd to 3rd shift at light throttle, hard every time. Firm to heavy throttle 2200+rpm higher on the shift, smooth every time. There is no hard downshift at all. Same if overdrive is locked out or not.

right is what I think and where I work on the map , in mine only when the oil is cold , but I'm almost ready

be patient I'm coming :wink:

truckbouy2 · **Posted:** Sun May 04, 2014 1:46 pm

"be patient I'm coming"

NOBODY rushed Davinci and you are the "Davinci" of ECM's and TCM's and we ALL are darn glad you are here at LOST.

Yeti · **Posted:** Sun May 04, 2014 2:13 pm

no no, too good to me, I will lead me, but I do not know everything :-)r

I'm a normal Human :lol:

thanks a lot

ebbnflow · **Posted:** Sun May 04, 2014 7:34 pm

truckbouy2 wrote:

"be patient I'm coming"

NOBODY rushed Davinci and you are the "Davinci" of ECM's and TCM's and we ALL are darn glad you are here at LOST.

X2. Thanks for taking the time to look into this issue Yeti.

545RFE, harsh 2 to 3 upshift fix?

Who is online