malibu43

Ordered this switch off ebay. However, I was not able to find a way to get the old switch out without potentially breaking the little clip-in bracket that holds it in place. I couldn't lift it out due to the rest of the shifter assembly being practically right on top of it. How did you remove the old switch?

Nice. What kind of conditions? Towing? Highway speeds or slow climbs?

Just wanted to give an update on transmission temps while towing after doing the pill flip. It was up around 100 for the last week and I probably did about 700mi of towing. Flat, freeway towing temps are between 165-185 (in general). So it does run a bit cooler overall. Pulling West on hwy 58 through Tehachapi, temps got up around 194. Towing southbound over the grapevine on I5 I got just over 200. On the climb up into the campground (same windy, slow 2 lane highway we climbed last year) temps still sat around 220 for about 15 minutes, and then the last 5 minutes got as high as 245. The last 5 minutes was still a slight climb at really slow speeds (10mph maybe) due to the road being very rough with lots of potholes and ruts. So I think as long as you are keep a lot of cool air moving over the transmission cooler, the pill flip does keep the temps a little lower. But once the airflow dies down, my temps still skyrocket while towing. I'm going to reach out to someone at PPE to find out if an upgraded transmission cooler would even help in that scenario. I would guess that the effectiveness of a larger air-cooled transmission cooler drops off quite a bit as the air-flow decreases...

Did the "Pill Flip" this last weekend. Took less than an hour, and that included started and then stopping for 15 minutes when I realized the transmission was still too hot and needed to cool down. Highest temp I've see so far is 140, mostly in the 120-130 range. No towing yet. I'll report back later in the month after we take our trailer out. It will be local towing at sea level, so not a real test though.

Thanks. They seem to only have products for diesels. They have one for the 3.0 Duramax. I wonder if ot will fit a 5.3l 1500.

I figured that, but it won't be free if it's not part of the TSB. I'll have to decide between free pill flip or paying for the 70C thermostat. I guess just swapping the thermostat is a tiny bit less work...

I can't really find much info and am not sure how to know if what I'm looking at is an upgrade over what's already in the truck. Hopefully the pill-flip will be enough to keep the overall temp low so that when it does spike for short time, it's not spiking as high...

I see. I wasn't sure what MYC and MYD meant, but I see now those refer to 6 speed transmissions only. Bummer. I'll still plan on doing the pill-flip at some point.

Hey guys. I was researching the pill flip, and started reading through another thread on these forums on the topic. I eventually came across this post: I pulled up that TSB and it appears it applies to my 2021 5.3l 1500. If that's correct, per GM the lower temp TBV should be installed on my truck, right? I was all set on doing the pill-flip, but if I can take it into the dealer and they install the lower temp thermostat for free, I'll probably start with that.

Thanks. I looked into the Pill Flip. Doesn't look too difficult. If I did decide to go for a larger cooler, is there one you'd recommend? Are those typically pretty simple installs?

Thanks. I'm not super familiar with transmission cooling on these trucks. I have the 8 speed. I'm sure it would keep the tranny cooler for normal driving/towing, but I wonder if the pill flip would help in my two scenarios since I'm so far above the bypass open temp anyway. Also, was that the correct technical bulletin number? That one's for radio issues. Interestingly enough, I did have some radio issues early on (bought in August 21) and I think they already did the software update when I took it in for that...

I wanted to know if anyone can recommend a good aftermarket transmission cooler for my 2021 z71 RST, 5.3l gas. Specific part numbers or links would be appreciated. We tow a 6400lb (max gross weight) travel trailer. Over the past year we took it out over 20 times (some long trips, some pretty short). Under normal towing conditions (including over the Grapevine on I-5 in July and August), the transmission temp stays right around 192F with some spikes into the 210's or maybe 220's. However, a couple of times it went up around 250F. Once was on the final leg of a long drive once we got up into the Sierras in July, last 20 miles or so of the climb was windy, 1 lane road, around 4K-5K feet altitude. The second time was in November and it was colder. But the campground was on a hill and we had to make a couple loops through the campground on very narrow, windy roads, and then topped it off with having to back up, up-hill, to get into our site. Temp topped out at 255F. So hopefully there are some aftermarket coolers out there that work well in these sort of low-speed, low airflow situations where I've seen issues. Does adding a transmission cooler affect warranty? Thanks!

Just got the truck back. I like it! Can definitely feel the difference in the way it rides.

So a couple weeks ago, 4WP told me the 5100's had been pushed out to mid-May. But then they called Monday to say they arrived! Dropping the truck off Thursday to get everything installed.

Looks good. You said those are 265/65/20? I'm gonna keep my stock 275/60/20's until they wear out, but then will definitely fit the biggest LT tires I can on there.