8hp70 heater bypass

Once my part is in, there are no moving parts in that housing. So if it's in, it's in. I'd suspect some kind of blockage elsewhere or I'm curious if there's an electrical issue causing false temp readings.

Purely conjecture, but possible.

Hawk did you get any more data this weekend? Any more instances of it happening?

Joe _S2013 said:

Hawk did you get any more data this weekend? Any more instances of it happening?

Click to expand...

No, it has been behaving this past weekend, plus I kept it in manual speed mode which for me drives so much better. But I haven't really gone anywhere far and away which is when it rears its head. Still thinking of doing a fluid/filter replacement to see if that will help. Maybe there is something floating around in there causing the issue. My truck is coming up on 100K miles and I have already started planning on doing the 100K servicing like brakes, spark plugs, etc. Just replaced my rear springs which was a nice ride improvement. So I am trying to research on doing the dropping of the Transmission pan and fluid replacement myself. I was thinking also about replacing the old thermal heat exchanger, but from what CAULK04 stated earlier I'm re-thinking that too. Don't see the point in wasting $400 for that item if I am going to get the same results.

I don't know how you drive or how long your trips are, but I set my cruise and go. I will use my cruise to adjust my speed, so more than once I looked down and saw my RPM's up and realized I inadvertently shifted to a lower gear. The +- gear buttons are right above my cruise control buttons on the 2014.

I don't want to talk you into anything, especially if you have less than 60K miles on your dealership replacement transmission. I really would ask about the warranty, I believe they should give you at least 25-50K on the replacement or the remaining on your factory warranty, whichever is longer. By putting the eliminator in you may have helped them by hiding another problem and possibly voiding the warranty. I would not take it to them with the eliminator installed if it is still under warranty. -I understand they wont do anything until it throws a code and that it takes almost complete failure before these transmission throw a code, but if it is under warranty and you have the dealership working on it, then I would just take video and take it in until they did something or it failed again. I tried multiple dealerships and private garages in my area to do the transmission filter and fluid change/flush (using Mopar 8/9 speed fluid), none would. All sated that it was maintenance free, and did not want to take the risk especially when I told them my problems (High heat, slight bump, random skipping). -One stated the transmission was bad and offered to get a JASPER trans, diagnosed and had a solution in a 5 min phone call (I am glad I did not listen to him).

All that said, the filter and fluid change is a lot easier than it is made to look online, especially if you have a sloped area that you can level the transmission rail, and mark, like i did. I did the Transmission Heater Assembly MOPARTSINC(transmission Heater Assembly 68463479AA) It is the entire assembly that bolts to the side of the transmission, and it is only held on by three bolts. It was only $139.00 and it only took me about 2 hours after I removed the exhaust crossover. If you decide to do it I will write up a quick procedure on what I did and some parts you might want to have. It was key for me, I cannot get my transmission temps above 200 and I have been trying hard (surprised I have not gotten a ticket yet). -Before it stayed above 200 this time of year. I am confident this, and fully filling my transmission fluid, fixed my problem. I want to make a run to Ohio before installing the eliminator, just to be 100 percent sure.

I had to added one quart more than I took out, and I am pretty confident I had it level and achieved the proper conditions. I am waiting for the new transmission fill plug, so when that comes in I plan on checking it again, just to re-re-re-verify. I think the low level was the cause of the bump and skipping. I initially did the, only put back in what you took out philosophy(4.5 quarts), and during testing the temps stayed below 200, but I still had the bump and the skipping. Once I did the second fill (using the driveway method) with the additional quart it shifted like butter, no bump when stopping, and I cannot get it over 200 degrees and speeds in excess of 100mph and heavy acceleration. -I know I sound like a broken record, but I went from thinking I needed a new transmission and babying it to racing mustangs on 66, MPG is at 14.5.

Total for all was at $650.00: $155.00 shipped for, Transmission Pan with integrated filter(changeable) Dorman 265-850 from rockauto(most resembled the stock) ; $170.00 shipped, Mopar fluid 7quarts on Amazon; $170.00 shipped, Transmission Heater Assembly MOPARTSINC(transmission Heater Assembly 68463479AA); 100.00 shipped in misc parts from MOPARTSINC (Fill plug, two exhaust flange bolts and nuts, two new shifter linkage screws); $18 shipped Amazon EVIL ENERGY 3.0" Exhaust Narrow Band Muffler Seal Clamp Stainless Steel 2PCS(had one missing, that is what happens when you buy used); $18 out the door at Home Depot HDX 2Gal Pump Sprayer. $20 out the door at Harbor Freight for, insulated welding gloves and torpedo level; and About 10 hours of time over two days.-still waiting on fill plug, so add about 1 hour to replace and setup for rechecking the transmission fluid level.

Thanks for that response! You have motivated me to do it myself. If you can send that write up on how too. i will follow your directions and see if for once and for all I can resolve this. Really appreciate it. And definitely let me know how your run to Ohio goes. Thanks again.

FWIW to anyone, I think I've replied to all currently inquiring about my t-stat eliminator and still have one left in stock. More material on the way to make more soon.

Joe _S2013 said:

I had to added one quart more than I took out, and I am pretty confident I had it level and achieved the proper conditions. I am waiting for the new transmission fill plug, so when that comes in I plan on checking it again, just to re-re-re-verify. I think the low level was the cause of the bump and skipping. I initially did the, only put back in what you took out philosophy(4.5 quarts), and during testing the temps stayed below 200, but I still had the bump and the skipping. Once I did the second fill (using the driveway method) with the additional quart it shifted like butter, no bump when stopping, and I cannot get it over 200 degrees and speeds in excess of 100mph and heavy acceleration. -I know I sound like a broken record, but I went from thinking I needed a new transmission and babying it to racing mustangs on 66, MPG is at 14.5.

Click to expand...

So you are saying the fluid being low was the cause of the bump that happens when coming to a stop?

I've had that bump for a while now and I don't know what it could be. Dealership already changed the driveshaft and that didnt do anything. I feel like it might be the torque converter not working right when slowing down to a stop.

Because even cruising in 4th or 5th gear and let off to coast, then get back on it. The engagement of the transmission is harsh to me, like the TC don't know what the **** it's doing. lol

I just got a quart in of the MOPAR 8 and 9 Speed Automatic Transmission Fluid to test to see if it cures my heat issue that pops up when i do long trips following Joe's instructions.

Interesting, I came across a video on YouTube regarding checking fluid levels on the ZF transmissions. Also what is interesting is the car they were working on had a bypass valve. Anyway watch the video and tell me what you guys think. https://www.youtube.com/watch?v=BPkCUfqi-gE&t=6s

Well that was a bust. After taking an hour alone to get my truck at the right pitch and trying to keep the temperature from going over 122 degrees. I let it sat for like 30 minutes and then I was trying to unscrew the refill plug from the side of the tranny pan and failing pretty bad. First trying with a 8mm Alan wrench ( fairly good size one too) but still could not break the seal. I only had a torx bit that would fit on my breaker bar and that worked. But as I was loosening, I forgot to turn the truck back on. So I had to turn the truck back and run thru all the gears Reverse Drive Park Neutral, holding 10 seconds each, turned off ESC. Opened the fill opening and I lost about 2 shot glasses of fluid. Closed it back up. Had my buddy run thru the gears again for me while watching the temps. Repeated and got the same result. I don't know if I am doing something wrong or maybe there is too much fluid in there and that is my problem. At this point I am going to have to run to the dealer and see what they think. By the way this was just for trying to see what my levels were. With a quart of fluid waiting to add. Is it possible that I have too much fluid in there from the start? I have been reading that too much can cause over heating.

You are reinstalling the fill plug with the truck still running right? If you shut it off before you install the plug you will get excess fluid spilling out.

joesstripclub said:

You are reinstalling the fill plug with the truck still running right? If you shut it off before you install the plug you will get excess fluid spilling out.

Click to expand...

yep, truck was running when I was taking the fill plug off. But as soon as I got it off, the fluid started pouring out, not trickling out. I did this twice and got same results. So I called it a day. I did take the truck to the dealership yesterday, to see if they could check the level of fluid. They told me that I have a lifetime power train warranty. And that they would not mind checking the fluid level. Problem is they will leave my truck parked for 2 weeks before they get to it. Shoot I would pay them if they would just communicate to me how long they were going to need it and get it back to me in a reasonable timeline. Already called them 3 times today alone for an ETA with no response yet.

Truck is back from dealer. Service guy said transmission fluid was full and in good condition. (I did tell him that I lost some transmission fluid when I attempted to check it.) What are you going to do. He also told me that transmission temps on these trucks is within normal range too. Oh well, guess I'll wait till it blows up. According to him my drive train is good till 2099. Guess my grand kids can b*tch when they have to bring it in. lol.

caulk04 said:

FWIW to anyone, I think I've replied to all currently inquiring about my t-stat eliminator and still have one left in stock. More material on the way to make more soon.

Click to expand...

I'll take it off your hands if it fits a 2014 with an 8 speed. I can PayPal you the cash. Thanks in advance.

Best regards,

-Mike

Replied.

As is I will still have one more in stock and will be making a few more as needed or as time allows. Contact if interested.

caulk04 said:

Replied.

Click to expand...

Thank you, Sir!

Best regards,

-Mike

One more thought. I added back onto the exhaust cross member, the heat shield clamp under the trans pan. See if that helps any.

BlownGP said:

So you are saying the fluid being low was the cause of the bump that happens when coming to a stop?

I've had that bump for a while now and I don't know what it could be. Dealership already changed the driveshaft and that didnt do anything. I feel like it might be the torque converter not working right when slowing down to a stop.

Because even cruising in 4th or 5th gear and let off to coast, then get back on it. The engagement of the transmission is harsh to me, like the TC don't know what the **** it's doing. lol

Click to expand...

I used to have this clunk coming to a stop and harder shifts after I changed my fluid before I realized you need to fill it with the rear wheels jacked up (on the 4wd) in order to get the trans pan level (not the truck level). Literally put a small level on the bottom of the pan and you’ll see you need to get the rear wheels like 6” high off the ground.

Once I did this I added 2 quarts before it started to overflow and she’s been smooth as silk. Using amsoil signature atf.

Hope this helps.

James

caulk04 said:

Replied.

Click to expand...

Thanks Jesse! I received the part today!

Best regards,

-Mike

Great, take care!

5 in stock ATM