Quick Transmission Question

[Ball4226]

I just finished a cross country trip from Florida to California pulling a trailer that weighed about 4,500 lbs. The truck has a firepunk street/track transmission and was operating around 144 degrees before the trip in 90 degree weather around town and cooler on the highway. Today I noticed the transmission running 155 degrees on the highway and in the 160s driving around town in 75 degree weather. I run the recommended dex/merc III, both the solenoid and transducer were recently replaced.

I checked the fluid today and it still looks clean, I did a full flush less than 20,000 miles ago. Im stumped on what could be causing the temp increase and havent been able to find any threads that talk about this specific problem.

Additional truck info: edge juice with attitude, fass 95 gph pump. everything else is stock.

 

[GAmes]

My guess is the tq converter isn't locking properly.

 

[Ball4226]

My guess is the tq converter isn't locking properly.

Is there anyway to test it? I know guys talk about driving around in second or getting a lockup switch. The truck has a triple disk and I can feel it lock up pretty solid around town and the highway.

 

[GAmes]

It's just like a slipping clutch. RPM goes up and speed doesn't go up at the same rate.

 

[Ball4226]

It's just like a slipping clutch. RPM goes up and speed doesn't go up at the same rate.

Not having any issues like that. Everything has been running normal, shifting normall (pretty hard like it always has) and holding RPM.

 

[Ball4226]

Update on the issue, after driving around town today I put the truck in park and let it idle for a bit. The temp on the transmission kept increasing. I’m pretty stumped here

 

[fest3er]

A long trip can 'clean' things and improve heat transfer. Those temps are still fairly 'moderate'. Could be the trip cleaned guck off the innards and the fluid is absorbing more heat. Or possibly the fluid is moving a little slower (filter getting dirty?) and picking up more heat than it used to.

 

[Ball4226]

A long trip can 'clean' things and improve heat transfer. Those temps are still fairly 'moderate'. Could be the trip cleaned guck off the innards and the fluid is absorbing more heat. Or possibly the fluid is moving a little slower (filter getting dirty?) and picking up more heat than it used to.

That makes sense. I’m going to change the fluid & filter in the next few weeks and get the bands tightened back up. I’ll let y’all know if I find anything out ‍

 

[Ball4226]

Update on the heat issue,

I changed the filter, fluid and adjusted the bands a few nights ago. There was no change in the amount of heat the transmission is producing. Around town I was seeing 160 degrees and on the highway it dropped slightly to the mid 150’s. I’m starting to wonder if the trans isn’t cycling fluid properly or if there isn’t something else internal going on.

I used valvolene dex/merc high mileage fluid and everything else looked good once I dropped the trans pan. A little bit of metallic material on the drain plug but it didn’t seem like anything excessive.

Thanks for all of yalls help, this is really stumping me.

 

[Timd32]

Does your valve body allow flow in park? The direction is usually to check in Neutral, I would expect it to rise in park after a run.

https://shopfirepunk.com/index.php?route=information/information&information_id=7

Where is the temp sensor located?

When changing the solenoids recently could it have moved in any way?

Can you check your sensor with a DVMM?

155 to 144 is a 7.6% swing how accurate is the gauge supposed to be accoring to the spec? If it a 5% gauge no big deal, even if its a .5% gauge still not sure if I would worry.

Does Firepunk have any data for this available?

 

[Ball4226]

Does your valve body allow flow in park? The direction is usually to check in Neutral, I would expect it to rise in park after a run.

https://shopfirepunk.com/index.php?route=information/information&information_id=7

Where is the temp sensor located?

When changing the solenoids recently could it have moved in any way?

Can you check your sensor with a DVMM?

155 to 144 is a 7.6% swing how accurate is the gauge supposed to be accoring to the spec? If it a 5% gauge no big deal, even if its a .5% gauge still not sure if I would worry.

Does Firepunk have any data for this available?

I’m not sure if it allows for flow in Park or not, the valve body is the high pressure body that firepunk puts in their transmissions as far as I know.

The temp sensor is located on the passenger side pressure port and the sensor is the one that came with the edge package. It didn’t register above 144 (ish) for the entire 2500 mile drive then suddenly out of the blue I started getting higher temps. I know the difference isn’t that extreme but it’s never happened before this.

I’ll try to document temps and what I’m doing at the time. Might provide some more insight to what’s happening.

I’ve also dug through their website a few times looking for troubleshooting. I’m not getting second gear starts which would be indicitive of a bad solenoid/transducer

 

[Timd32]

I’m not sure if it allows for flow in Park or not, the valve body is the high pressure body that firepunk puts in their transmissions as far as I know.

The temp sensor is located on the passenger side pressure port and the sensor is the one that came with the edge package. It didn’t register above 144 (ish) for the entire 2500 mile drive then suddenly out of the blue I started getting higher temps. I know the difference isn’t that extreme but it’s never happened before this.

I’ll try to document temps and what I’m doing at the time. Might provide some more insight to what’s happening.

I’ve also dug through their website a few times looking for troubleshooting. I’m not getting second gear starts which would be indicitive of a bad solenoid/transducer

I doubt it flows in park and you need to check levels and the sort in neutral at operating temp as per that FAQ unless you know different for your truck.

Could be 144 deg is the lowest temp and it was actually not working in the past? Here is my 2018 on a 50deg cold start, no idle time at all, mine was 18% off on the low end, the min on some numbers is 100 and 104, they should be pretty accurate at operating temps but who knows are they?

I would use the contact us from that page and see if a tech can help you out a bit. I have a bunch of Goerend parts and they have great support for customers, I would think firepunk be about the same they seem pretty popular.

 

[Ball4226]

I doubt it flows in park and you need to check levels and the sort in neutral at operating temp as per that FAQ unless you know different for your truck.

Could be 144 deg is the lowest temp and it was actually not working in the past? Here is my 2018 on a 50deg cold start, no idle time at all, mine was 18% off on the low end, the min on some numbers is 100 and 104, they should be pretty accurate at operating temps but who knows are they?

I would use the contact us from that page and see if a tech can help you out a bit. I have a bunch of Goerend parts and they have great support for customers, I would think firepunk be about the same they seem pretty popular.

View attachment 109410

The sensor will read below 144, it was 45 degrees this morning and the temp sensor was reading 50. So that part of it seems pretty accurate.

As far as I know the 47re doesn’t flow in park, but still never had this issue before. I’ll report back after I talk to them.

Thanks for your time

 

[cerberusiam]

You aren't getting accurate fluid temps with the sensor in that port anyway, might as well ignore it. All the pressure ports are dead end and do see fluid flow, they just heat soak form the engine and trans operation.

Move the probe to the cooler output line so have an idea what the actual fluid tmep is doing depending on load and ambient temps. Temps are too low to be reliable anyway, once you put the probe in the right spot you will see why.

 

[Ball4226]

You aren't getting accurate fluid temps with the sensor in that port anyway, might as well ignore it. All the pressure ports are dead end and do see fluid flow, they just heat soak form the engine and trans operation.

Move the probe to the cooler output line so have an idea what the actual fluid tmep is doing depending on load and ambient temps. Temps are too low to be reliable anyway, once you put the probe in the right spot you will see why.

Awesome, Ill work on that. Looks like glow shift makes a line tap that'll fit the 47re lines even though it is listed as a 68re/rfe

https://www.glowshiftdirect.com/transmission-line-t-fitting-adapter-for-dodge-ram-cummins/

 

[cerberusiam]

Yep, that is what is used to tap the cooler output line.