8hp70 deleting just thermostat

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Ram1683

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Hey everybody. I just did a ton of reading on here about the revmax heater bypass. I installed mine months ago but since late October as the cold set in I could drive an hour and not have the trans touch 100⁰. My issue is the trans acts like a different animal until i can get it to 120ish which isnt easy. I called ZF and spoke with them, they told me 130⁰ range I should be fine but an hour at 80⁰ isn't good. It needs to warm up to shift properly. I thought about pulling the just heater block off plate. I have a 180 stat so in my head trans would sit in the 160⁰ range. On here I read that you shouldn't run just the thermo bypass, either all or nothing. What would the harm be by running the warmer but not the thermostat?
 

Wild one

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Hey everybody. I just did a ton of reading on here about the revmax heater bypass. I installed mine months ago but since late October as the cold set in I could drive an hour and not have the trans touch 100⁰. My issue is the trans acts like a different animal until i can get it to 120ish which isnt easy. I called ZF and spoke with them, they told me 130⁰ range I should be fine but an hour at 80⁰ isn't good. It needs to warm up to shift properly. I thought about pulling the just heater block off plate. I have a 180 stat so in my head trans would sit in the 160⁰ range. On here I read that you shouldn't run just the thermo bypass, either all or nothing. What would the harm be by running the warmer but not the thermostat?
Throw the Revmax kit away,return it to stock and hunt up Jesse Caulk /Caulk04 for one of his thermostat bypasses,it allows you to keep the thermal heater in play . The RevMax kit leaves alot to be desired especially compared to Jesse's bypass.
 

Wild one

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Different Drummer

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Just as an experiment during cold weather is there any way you can fabricate something to obstruct air flow to the Transmission oil cooler in front of the Eng? Might help to get the Temp. up to the 130 degree range.
 

crash68

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Just as an experiment during cold weather is there any way you can fabricate something to obstruct air flow to the Transmission oil cooler in front of the Eng?
The 8HP in the Ram 1500 trucks use the top couple rows of what's also the AC condenser as the trans cooler
 
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Ram1683

Ram1683

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Just as an experiment during cold weather is there any way you can fabricate something to obstruct air flow to the Transmission oil cooler in front of the Eng? Might help to get the Temp. up to the 130 degree range.
I was actually thinking about that. Used to have to do it to one of my s10's to get heat. 160⁰ stat was a bad idea in that.
 

Different Drummer

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The 8HP in the Ram 1500 trucks use the top couple rows of what's also the AC condenser as the trans cooler
Yes, that is the area I was suggesting he might try to restrict airflow to. Just the area at the top. Even something temporary as an experiment. Maybe a piece of heavy cardboard fastened with some zip ties. I don't think he could hurt anything giving it a try and it would certainly be easily removed.
 

t0ymach1n3

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I deleted all that ******** and ran AN lines and fittings to the trans. Tapped the trans to accept the AN fittings and the trans runs like a champ. Screw all that other stuff.
 

Wild one

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I deleted all that ******** and ran AN lines and fittings to the trans. Tapped the trans to accept the AN fittings and the trans runs like a champ. Screw all that other stuff.
Why didn't you use the 8HP70 out of a car,they don't use the thermal heater,and the case is already tapped for fittings
 

t0ymach1n3

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Cause I didn't have one available at the time, didn't get that knowledge till well after the fact and I still would have needed to either run some different trans cooler lines or tapped the trans to do what I wanted anyways. I will say it's not that difficult to tap and run the lines and looks pretty slick to boot.
 

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