raabdunn

If anyone is wondering, I took the truck to a tuner shop and they hooked it up to HP tuners, deleted the ISS and did a couple other small things and now the truck runs tip top. Thanks.

I'm going to take it into a shop tomorrow, but I'm not confident they'll be able to fix the problem. I think I found it. I checked for codes, got a P0717 Input Speed Sensor low voltage. Quadruple checked and neither my old or new trans have an external ISS. I unplugged the trans connector and found the new trans is a 13 pin, where as my old one is a 15 pin. Not too happy about that. So now I'm digging into wiring schematics to see if those two pins are in fact causing the code. Anyone know if I can just get the TCM reflashed to allow for the 13 pin tranny?

Ain't that the truth! I can rebuild a motor no problem but man am I a newb when it comes to tranny issues! When the tranny slips the temp spikes up. It will go back down a little until it slips again which is why I concluded the overheating issue isn't the cooling system but something internal. Could the TC not be locking? This tranny came with a pan already fitted with a drain plug which I'm pretty happy about! It seems similar if not the same size as the OEM pan on my old tranny. I'll measure it today after work. I'm also just going to take some fluid out and run it trusting that the dipstick reading is true (which is what JEGS told me to do although the guy didn't really seem too knowledgeable). My reasoning is that if the pan was bigger, that would mean the stick would show I would need additional fluid beyond normal OEM capacity. If it was a smaller pan then I probably overfilled (which is what is showing on the dipstick). Honestly don't really know at this point. Kind of at a loss.

Update: Drove home last night and the transmission was fine. Shifted fine and got up to 165 degrees. This morning I'm driving in and after about 20 minutes on the highway, my rpms started fluctuating. I got off the highway and the truck has a pop shift inbetween all gears. A small one from 1/2 and a huge one from 3/4. In fact I have to take my foot off the gas for it to shift or else the RPMs will just keep climbing. This is causing the heat issue. I'm guessing I didn't do a good enough job to ensure the TC was spinning freely before I bolted it up to the pressure plate. Could this be the issue of a binding (or not locking) TC? Thanks again. By the way I have a new CEL. I'll scan it after work today.

Thanks for the reply! I think I'm going to go ahead and get the radiator, a new aux cooler, and new lines and see if that fixes the issue. 190 isn't terrible, but it was climbing steadily without signs of slowing down. Only reason it didn't go higher is because I got to work and shut the truck off. I did check it with the engine running. Trans was around 150-160 degrees. Anybody else have any ideas?

Hi all, new to this forum. I apologize if this topic has been covered before. Here goes: I have a 2007 Silverado 1500 4WD with about 130k on the dial. About 2 months ago I was driving down the road and I got a warning to shut my truck off because my transmission was overheating. I looked at the trans temp and it was pegged at 275. I shut it down and limped it to a transmission shop. After $1200 of diagnostic work they told me my TC blew up and threw shards all over the transmission and that I would need a rebuild for another 6500. I said no thanks I'll just order a new 4L60e from JEGS (with a new TC of course) and throw it in myself. While there were metal fragments in the pan, I don't think that the failed TC caused the overheating issue. Fast forward to now and the new trans is in. I drove it to work this morning and the trans got to 190. I believe it would have gone higher as it was still climbing up until I shut it off. Not catastrophic but very concerning nonetheless. I flushed my fluid lines and trans cooler before installing the new trans. What do you all think? Should I start with a new cooler/lines and see if that fixes my issue? Something to note, the instructions from JEGS states that their transmissions come with an aftermarket pan, and my dipstick readings may be innacurate. They instruct you to fill the transmission to proper level (12-13 qts.) I took this into consideration and filled mine with the 11.2 stated as capacity for my truck. The fluid is very high on the dipstick. Perhaps the excess fluid is causing overheating as well? Any and all help is greatly appreciated. Thanks in advance.