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chrysler 545rfe need advice #4692088
03/12/18 05:17 AM
03/12/18 05:17 AM
Joined: Mar 2018
Posts: 13
Australia
Johnnos Offline OP
Johnnos  Offline OP
Joined: Mar 2018
Posts: 13
Australia
Hi everyone,have a little Jeep jk diesel shorty running the 545rfe trans.It started making a loud high pitch whine noise when cruising at 100kph and i would lift my foot to coast and noise starts up,only does it after about 25mins and at 75 degrees C operating temp.runs fine through all gears and after chasing diff issues/driveshafts ect we pulled the box out and had it fully stripped down but they found nothing and reassembled it with new seals,gaskets,frictions and a few other bits and pieces.The noise went away once reinstalled and now 3500klm later it has come back again. are there any transmission guys that could offer advice as the local shops don't seem to confident.i have a recording of the noise i can send if that helps.Thanks in advance.......

Re: chrysler 545rfe need advice [Re: Johnnos] #4692191
03/12/18 08:05 AM
03/12/18 08:05 AM
Joined: Jan 2013
Posts: 1,831
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 1,831
Texas
I am not a drive train expert & know next to nothing about Jeeps .

Having said that , I would investigate the diff and maybe the drive shaft .

Does it have limited slip diff ? When was the last drain & fill on the diff . Transfer case ? Front diff ?


Wyr
God bless
Re: chrysler 545rfe need advice [Re: Johnnos] #4692296
03/12/18 09:55 AM
03/12/18 09:55 AM
Joined: Dec 2002
Posts: 4,143
The Garden State
Whimsey Offline
Whimsey  Offline
Joined: Dec 2002
Posts: 4,143
The Garden State
It sounds like your diff fluid thins out after 25 minutes of driving and reaching 75*C. What viscosity are you using? Another possibility is is the shims for the ring and pinion are not set properly. Our 2005 Ford Explorer does just the opposite, it whines when you accelerate. It was rebuilt 3 times under warranty and it still does it. It was rebuilt by the dealer and I can only assume they don't really know how to shim the ring and pinion correctly. It has a 195,000 miles it and the whine has become a "white" noise in the background.

Whimsey

Re: chrysler 545rfe need advice [Re: Johnnos] #4692372
03/12/18 11:26 AM
03/12/18 11:26 AM
Joined: Mar 2014
Posts: 662
Twin Cities MN USA
Inspecktor Offline
Inspecktor  Offline
Joined: Mar 2014
Posts: 662
Twin Cities MN USA
We had a 99 Suburban that had a whine under certain conditions. Turned out to be front diff, made noise when freewheeling.


2001 Ranger 3.0 156,000 mi
2006 Dakota 4.7 155,000 mi
1986 GL1200A 72,500 mi
2001 Buick LeSabre Limited 291,500 mi
Re: chrysler 545rfe need advice [Re: Johnnos] #4692871
03/12/18 08:02 PM
03/12/18 08:02 PM
Joined: Sep 2015
Posts: 2,256
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,256
Malaysia
Originally Posted By: Johnnos
i have a recording of the noise i can send if that helps.Thanks in advance.......

Yes, care to upload the audio?
Btw, what's the oil grade in use vs what owner manual says and its L capacity?
75*C operating temperature after a 25 minute drive is too high ..... and abnormal for an unloaded machine, IMHO.

Last edited by zeng; 03/12/18 08:03 PM.
Re: chrysler 545rfe need advice [Re: Johnnos] #4692981
03/12/18 09:29 PM
03/12/18 09:29 PM
Joined: Oct 2014
Posts: 2,408
San Antonio, TX
Nyogtha Offline
Nyogtha  Offline
Joined: Oct 2014
Posts: 2,408
San Antonio, TX
Are you using a licensed ATF+4 transmission fluid?

https://www.centerforqa.com/chrysler-brands/

What I'm reading is 75C is the ATF temperature, is that correct? My Ram EVIC displays ATF temperature but not differential temperature.

That temperature (75C = 167F) is about the top ATF temperature Ive seen my similar transmission reach in Texas heat pulling a trailer at 75 MPH (120 KPH). My truck has an air cooled transmission fluid cooler with no thermostat regulation.


"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: chrysler 545rfe need advice [Re: Johnnos] #4693037
03/12/18 11:18 PM
03/12/18 11:18 PM
Joined: Mar 2018
Posts: 13
Australia
Johnnos Offline OP
Johnnos  Offline OP
Joined: Mar 2018
Posts: 13
Australia

Re: chrysler 545rfe need advice [Re: Johnnos] #4693045
03/12/18 11:26 PM
03/12/18 11:26 PM
Joined: Mar 2018
Posts: 13
Australia
Johnnos Offline OP
Johnnos  Offline OP
Joined: Mar 2018
Posts: 13
Australia
Front dana 44 is aftermarket and we pulled that apart and found nothing,same for rear diff and both shafts.Having the trans out and freshened up was the only time we got rid of the noise but only for 3500 klm. Its a right pain in the [censored] trying to diagnose the issue...

Re: chrysler 545rfe need advice [Re: Nyogtha] #4693050
03/12/18 11:30 PM
03/12/18 11:30 PM
Joined: Mar 2018
Posts: 13
Australia
Johnnos Offline OP
Johnnos  Offline OP
Joined: Mar 2018
Posts: 13
Australia
It runs a big cooler and that temp is taken on the exit line going to the cooler after its been through the transmission.What is your normal temp on trans around town?

Re: chrysler 545rfe need advice [Re: Johnnos] #4693062
03/13/18 12:00 AM
03/13/18 12:00 AM
Joined: Oct 2014
Posts: 2,408
San Antonio, TX
Nyogtha Offline
Nyogtha  Offline
Joined: Oct 2014
Posts: 2,408
San Antonio, TX
Originally Posted By: Johnnos
It runs a big cooler and that temp is taken on the exit line going to the cooler after its been through the transmission.What is your normal temp on trans around town?


Typically 140F to 150F in warm Texas weather, it can get to 160F in stop & go rush hour traffic when ambient temperatures are in excess of 100F and pavement temperature well exceeds that. However, I think my EVIC displays the transmission sump temperature in my 68RE, I think the measurement point is part of the submerged TCM in mine.

What transmission fluid are you using? Everything I've read is these transmissions are very picky about operating correctly on licensed ATF+4, or one boutiqe substitute Redline C+ that's reported to have the same additive package as licensed ATF+4 but a superior base stock. Interesting how it went away temporarily with fresh fluid of whatever you're using. It makes me curious about fluid without the correct frictional properties perhaps being at least part of the picture.

BTW I've never heard a similar noise to what you posted from my transmission.

You may find this web site to be of interest.

https://www.allpar.com/mopar/transmissions/545RFE.html

Last edited by Nyogtha; 03/13/18 12:13 AM.

"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: chrysler 545rfe need advice [Re: Johnnos] #4693069
03/13/18 12:13 AM
03/13/18 12:13 AM
Joined: May 2012
Posts: 1,399
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,399
Georgia
That sounds like gears to me. Does it do it in a certain gear?

Re: chrysler 545rfe need advice [Re: Nyogtha] #4693075
03/13/18 12:20 AM
03/13/18 12:20 AM
Joined: Mar 2018
Posts: 13
Australia
Johnnos Offline OP
Johnnos  Offline OP
Joined: Mar 2018
Posts: 13
Australia
Its running penrite ATF FS MULTI at the moment but did the same thing on atf plus 4 ?

Re: chrysler 545rfe need advice [Re: AVB] #4693076
03/13/18 12:24 AM
03/13/18 12:24 AM
Joined: Mar 2018
Posts: 13
Australia
Johnnos Offline OP
Johnnos  Offline OP
Joined: Mar 2018
Posts: 13
Australia
Hi its only when warmed up and trying to coast at 65 mph or more,if u slow it down to 50mph after it starts it does not come back..

Re: chrysler 545rfe need advice [Re: Johnnos] #4693077
03/13/18 12:26 AM
03/13/18 12:26 AM
Joined: Oct 2014
Posts: 2,408
San Antonio, TX
Nyogtha Offline
Nyogtha  Offline
Joined: Oct 2014
Posts: 2,408
San Antonio, TX
How old or maybe burnt was the ATF+4 when it started making the noise?

Any reason you used the Penrite fluid after reassembly?

Anything to lose displacing the Penrite fluid with licensed ATF+4 and seeing what results you get except whatever a system fill of ATF+4 costs in your area?


"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: chrysler 545rfe need advice [Re: Nyogtha] #4693079
03/13/18 12:34 AM
03/13/18 12:34 AM
Joined: Mar 2018
Posts: 13
Australia
Johnnos Offline OP
Johnnos  Offline OP
Joined: Mar 2018
Posts: 13
Australia
Trans rebuilder was happy to run this in it and we were not sure if it had fixed original problem,atf plus 4 is pretty hard to get here and super expensive.But i hear what your saying and id like that in there myself.

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