I just had my 48RE flushed and the fluid replaced with Amsoil. When I replaced the fluid, I also added a PML tranny pan. I have a temp gauge located on the test port and before Amsoil, I was getting readings of 180-190 around town unloaded and up to 200 when towing my 5ver. Now I'm getting readings of 190-200 around town unloaded. I haven't towed my 5ver yet, but I'm afraid of what kind of temperatures I'll be seeing when I do. Anyone have any ideas why I would see an increase in temperature with Amsoil.

 

Seems to me that the new tranny pan is not the issue here. My guess would be that it has to do with the Amsoil. Personally I use all dealership fluids on my truck except for the engine oil, but Valvoline premium blue is endorsed by Cummins, so it’s ok. I figure these trucks were engineered to run with manufacture spec fluids and every single aftermarket fluid is going to have different properties from the stock ones even if they are the same viscosity. That’s just my two cents.

 

I think the first response you'll get is regarding the wisdom of using the test port. But all things being equal, temps should not change at all just because you changed fluid. Also, I thought the idea of getting the aftermarket pan was to get more fluid and thus lower temps. Without better info, I suspect it may have something to do with the flush itself... maybe?

 

2x on the flush, probably a stupid question, but did they change the filter as well?

 

This was my initial guess also, the filter could be super clogged? Mabe you have a bad gauge?

I've been running the Amsoil ATF for 15k+ miles and I can't get it above 190* towing in stop and go traffic.

A long time ago someone posted a image of a tranny temperature picture. It showed certin degrees that the tranny reaches and when the ATF starts to break down, I don't know where to find it but maybe someone knows and can post it up.

*Edit*
This isn't the exact picture I was reffering to but it's the same concept.

 

Outside temps change during the summer so much how can you say that your temp went up due to anything but higher temps outside. I don't think you have a problem at all it is just increased outside temps went up, so have your tranny temps. A flush, Amsoil, or PML pan will not cause this issue. Now an ill fitting tranny filter may cause an issue if they didn't replace the rubber o-ring.

 

Yes, they changed the filter.

 

when I changed just to Amsoil trans fluid in my 01 I saw 10* drop in temp.

have you had the bands adjusted lately???

 

What brand filter did yo go with Is it the sme brand as the one that came out, did they install it correctly?

 

It was a mopar filter. Whether or not it was installed correctly, is beyond me. The shop I took it to is reputable, but mistakes can happen.

 

Theres the problem, relocate your temp sender to the pan or hot line. What you reading is stagnent oil temp...not what is circulating.

Richard

 

I was always told to place trans temp senders in the pan for the most accurate temp readings....but it seems like none of the install sheets being sent with the gauges say anything about it...I guess it is for easy install

 

I've used Amsoil AFT in all of my Dodge transmissions over the last 7 years and have never had a problem with the fluid nor have I had one fail on me because of the fluid I used. With you having a bigger pan and new Amsoil fluid I would think you would see a drop in temp but then you did say you let them flush it (power flushes can casue problems on trans that have not be serviced regularly) and that the probe is in a test port and that is the wrong place to have it as it should be on the line out.

My $0.002

 

I had my tranny serviced at 30K and did the flush/Amsoil at 47K. Irregardless of where the temp probe is, I'm wondering why I'm seeing an increase in temperature with Amsoil.

 

The flush could have forced metal particles in to the port and they have collected at the end of the probe and are retaining heat and there for making the gauge go higher.