P06DD Oil pressure

Jayselectricco · June 5, 2023

1 hour ago, mikeyk101 said:

Sorry, a little off topic but... That's an odd outcome. I've been using my RANGE AFM disabler for several years now and it never had an effect on transmission temps or give me any other problems. Well maybe when it was time for emission testing but that's easily solved. What did help for trans temp was swapping out the Transmission thermostat to the updated ones. Mine still seems to run a little warmer than others have reported but stays in the 150-175⁰ range. It only went up considerably north of 200⁰ when I was towing my toy hauler up a steep grade for several miles. Other than that, it has pretty much stayed at a much more reasonable temp. But taking it out and seeing lower temps would confirm that something was going on.

Do you have a 5.3 or 4.3? I have searched and searched for what exactly the AFM disabler does to keep it out of v4 mode, and what several people have told me is that it tricks your computer into sensing a heavy load to trigger the v4 off. If that is what's happening then there is no way the torque converter is not behaving differently. It may be that it effects the 4.3 differently than the 5.3, or may be something in the new firmware that doesn't agree with the 4.3. When my TQ went out I did the thermal bypass and added 2 transmission coolers, along with the new TQ but my temps still went very high. I thought I would just pull the range out and try it, and my temps dropped tremendously. I pulled a big load over an hour mostly uphill and my trans temps never got over 169. However with the range in the same trip unloaded id be going past 240. Very Crazy! I have a friend that has a Range on his 5.3 and its been on for years just like you with no problems.

mikeyk101 · June 5, 2023

Yes, I do have a 5.3l. And I was doubting you at all in your experience. It just seemed strange but you could be right about the 4.3 vs 5.3. I would assume that if it was tricking the truck into believing it was under load, gas mileage should also suffer but I haven't really notice much difference in V8 using Range vs normal V8/V4.

But very interesting...

Grumpy Bear · June 6, 2023

7 hours ago, Jayselectricco said:

Do you have a 5.3 or 4.3? I have searched and searched for what exactly the AFM disabler does to keep it out of v4 mode, and what several people have told me is that it tricks your computer into sensing a heavy load to trigger the v4 off. If that is what's happening then there is no way the torque converter is not behaving differently. It may be that it effects the 4.3 differently than the 5.3, or may be something in the new firmware that doesn't agree with the 4.3. When my TQ went out I did the thermal bypass and added 2 transmission coolers, along with the new TQ but my temps still went very high. I thought I would just pull the range out and try it, and my temps dropped tremendously. I pulled a big load over an hour mostly uphill and my trans temps never got over 169. However with the range in the same trip unloaded id be going past 240. Very Crazy! I have a friend that has a Range on his 5.3 and its been on for years just like you with no problems.

How much difference is there in rpm running a steady, say 60 mph between Range and no Range device?

Jayselectricco · June 6, 2023

12 hours ago, Grumpy Bear said:

How much difference is there in rpm running a steady, say 60 mph between Range and no Range device?

That's a really good question. I am not really sure what the rpm difference was, but I know it was driving differently. I actually liked the way the transmission shifted better with the range plugged in. I do remember it being below 2k in high gear running 65-70 about the same as it is now, but it was definitely shifting different.

Grumpy Bear · June 6, 2023

2 hours ago, Jayselectricco said:

That's a really good question. I am not really sure what the rpm difference was, but I know it was driving differently. I actually liked the way the transmission shifted better with the range plugged in. I do remember it being below 2k in high gear running 65-70 about the same as it is now, but it was definitely shifting different.

I thought perhaps the converter was not locking up. That will generate some heat.

Jayselectricco · June 6, 2023

51 minutes ago, Grumpy Bear said:

I thought perhaps the converter was not locking up. That will generate some heat.

That would make sense, the range was causing the converter to not lock up and that's what burnt my torque converter up. The new would have been next if I hadn't of pulled it.