ATS trans cooler bypass valve

[lilbxl]

Anyone replace their stock TBV with the one from ATS or Revmax? I understand it allows the trans fluid to pass through the cooler at all times. Reading statements of significantly reduced trans temps. Also read that the stock units can stick and not allow fluid to the cooler. Looking for experience and opinions.

 

[TFucili]

No personal experience, but it was a hot topic on ramforum. Quite a few guys did the mod, and all reported much lower trans temps.

 

[lilbxl]

That’s what I’m reading, that most everyone who has installed this has a pretty significant drop in temperature. I’m not really worried about the cold weather part of it as I am in Louisiana. I’m thinking this may be beneficial to me.

 

[TFucili]

The thing I don't know is the actual benefit. Using my 6.4/66RFE as an example, even pulling at over 23K combined the thing stays locked up and rarely, if ever has gone over 170-172. So, if I installed the bypass and it ran at 130 or 140, what does that translate to in time before overhaul?

 

[lilbxl]

I just pulled my 36’ TT that weighs in at 10k~ on a 3 hour trip. On the way there temp got up to 188* and I was going 70~73mph. I’m just not real sure where the temps are supposed to be. It was 94* air temp. Probably just way over thinking this but I’ve seen charts of temperature related to trans life and cooler is better.

 

[Cummins12V98]

68RFE towing 29k combined at 100 degrees it would run 172. AISIN towing 35k combined 165 -168 at 100 outside.

I see ZERO issue for any type of device.

 

[lilbxl]

68RFE towing 29k combined at 100 degrees it would run 172. AISIN towing 35k combined 165 -168 at 100 outside.

I see ZERO issue for any type of device.

I was pulling just 10k and temp got to 188*. Slowed to 65 mph and temp came down to 180*. Not sure why I’m running about 20* above what you have stated?

 

[RVTRKN]

Aren’t they adjustable? I know the 2003 thru 2009 are, and are set for @ 140*. All it is is spring pressure that changes the closing temp. It closes the port on temperature rise, forcing the oil thru the heat exchanger. It’s based on path of least restriction, allowing oil to bypass the more restrictive heat exchanger, when cool. Adjusting for a lower temperature is cheaper than replacing it. If you don’t change the heat exchanger, why/how could changing the bypass make any difference, your still forcing the same oil through the same heat exchanger?

Anyone replace their stock TBV with the one from ATS or Revmax? I understand it allows the trans fluid to pass through the cooler at all times. Reading statements of significantly reduced trans temps. Also read that the stock units can stick and not allow fluid to the cooler. Looking for experience and opinions.

 

[AH64ID]

I would think that even in hot weather it would increase warmup times which would have an effect on wear and economy.

 

[kthaxton]

A solution looking for a problem.

That’s what I’m reading, that most everyone who has installed this has a pretty significant drop in temperature. I’m not really worried about the cold weather part of it as I am in Louisiana. I’m thinking this may be beneficial to me.

What I would ask is a drop in temperature compared to what? If your trans temp is running as most have posted here (168-180-ish under most circumstances) then that is ideal. Going lower than that is not beneficial, and is slightly detrimental.

How would it benefit you? Do you see higher temps under normal conditions?

 

[TCDiesel]

I'm with KT on this one, WHY? run cooler.

Back 20 years ago Your ATF life was connected to running heat, Not so today. I also don't support life Lube, IMO Trans should be service and lube changed or freshen up.

 

[lilbxl]

A solution looking for a problem.



What I would ask is a drop in temperature compared to what? If your trans temp is running as most have posted here (168-180-ish under most circumstances) then that is ideal. Going lower than that is not beneficial, and is slightly detrimental.

How would it benefit you? Do you see higher temps under normal conditions?

Everyday temps are 167*-170*. Temp hit 188*-190* when I was towing my camper for the first extended length trip, 3 hours.

 

[Cummins12V98]

I was pulling just 10k and temp got to 188*. Slowed to 65 mph and temp came down to 180*. Not sure why I’m running about 20* above what you have stated?

I did have a double deep MagHytec pan and was running AMZ/OIL. Never had overheating issues. ONLY time I saw temps high was towing there a town stop and go. It was about 225, as soon as i hit the Highway it was normal. Pic is 11 HO DRW 68RFE

My AISIN simply runs cool!

 

[lilbxl]

So, could I do more bad then good to the transmission by doing this?

 

[TCDiesel]

In extreme Cold Yes.... -0 and colder.

 

[lilbxl]

In extreme Cold Yes.... -0 and colder.

Should not see those temps here in Louisiana.

 

[CAROLINA CUMMINS]

Generally everyone posts their trans temps when towing, what about on steep winding gravel roads, goat paths, etc... What temps are ya'll seeing there? Only time mine has gotten close to 200deg was on a dirt road, 1st/2nd gear and no airflow but engine fan (admittedly that was before fluid/filter change and MH Pan).

 

[AH64ID]

Generally everyone posts their trans temps when towing, what about on steep winding gravel roads, goat paths, etc... What temps are ya'll seeing there? Only time mine has gotten close to 200deg was on a dirt road, 1st/2nd gear and no airflow but engine fan (admittedly that was before fluid/filter change and MH Pan).

I saw 174° on a couple mile steep pull in 1/2 at approx 18K GCW on a 80° day.

I'll have some more slow and steep pulls this fall to see how hot it gets.

I have also tried 4Lo to get into a higher gear so the TQ converter would lock but it wouldn't lock below 20 mph regardless of gear... there goes my idea of 4.10's helping at low speeds get to TQ lock sooner.

 

[CAROLINA CUMMINS]

We generally drive a lot of gravel/mountain roads in 1st or 2nd, was running 175 yesterday at 75 deg with A/C on, no load. Wonder if bypass would help in those situations?

 

[AH64ID]

We generally drive a lot of gravel/mountain roads in 1st or 2nd, was running 175 yesterday at 75 deg with A/C on, no load. Wonder if bypass would help in those situations?

What's wrong with 175°?