yourleftnut1

I have no idea what the stall speed for the torque converter is on mine. Now that you mentioned the issue with V8's only, I have never seen a single 4.3L on those 100's of work orders at work. Each rebuild comes with a work order that specifies the engine it is used for and I've seen only V8's. lol.. All torque converters are replaced with each rebuild. Maybe I won't have to replaced the TC on my truck after all. fingers crossed. We have a torque converter rebuilding department too. When I get the chance, I Will check how often the 4.3 gets rebuild. i seriously do not remember seeing any 4.3's coming through. Glad I didn't get the Z71 V8 version then. I don't do a lot of towing, so the 4.3L fit the bill. Heaviest tow was a 500lb (probably less) jon boat lol.. dropping the trans pan and changing out the spark plugs seem a lot easier on the V6 vs V8 too..

i've done this to other cars before and I have gotten almost close to the max capacity specified by the manufacturer.

I own a 4.3L with 70k miles on it. Decided to do a transmission flush just using the internal pump. After doing the transmission thermostat bypass MOD using the tap method, I hooked up clear hoses to the cooler. Started truck and let the pump do its thing. I've only managed to get about a total 8 quarts out including the fluid left in the pan. From my researches, a simple drop pan should get around 6 quarts and a flush should get almost all of it out. Somewhere in the neighborhood of 12 quarts if I'm not mistaken. I checked the fluid level before the flush at normal operating temperature and it was on the HOT side. Did I get a false reading and i've always been low on fluid? Trans does NOT have any leaks. I filled her back up with 8 quarts of valvoline synthetic ATF (red jug) after replacing filter and seal. It's on HOT and runs fine after a week now.. Gonna do another flush and see if I get the same amound..

I love my silverado. 70k miles and no issues so far, but I must say, the transmission seems like the weakest link. I haven't messed with other auto manufacturer's transmission at work, but seems like GM took a short cut on the 4L60E's and 6L80/90's. Almost all the internals could be upgraded to a better part and it doesn't cost much more. Don't know what the previous owners used their trucks for, but we would get transmissions in with cracked drum pistons, cracked clutch plates, and many other things. We always replaced those failed parts using sonnax after market parts.. seems like the torque converter on my truck will eventually fail too. the good part is, I can rebuild my entire transmission in my garage and borrow tools from work to work on it over the weekend. i could even take it to work and have it test run on a dyno before installation.

So I'm a transmission builder for a major remanufacturing company. I'm quite new to this field. I rebuild 6L80/90, 4L60E, and 700. I owned a 2015 4.3L silverado. I'm new to GM trucks. I live in the midwest. The 190F transmission temps have always bothered me quit and bit. First I thought maybe an external cooler would be beneficial, but then after a ton of researches, it turns out, GM has the thermostat set at around 190F. This makes putting an external cooler useless. I ran into this mod and this thread. Decided to give it a go, but using the TAP method. My normal temps dropped at least 20F. For city driving, I'm usually around 160F. Freeway at 75MPH, it's around 170F. Before even without a tow load, it would be around 195 in the summer. yikes! Like one user mentioned, during the winter, the temp never reaches 100F. That also bothers me too.. Hopefully this mod will help with that in the winter. Anyways, I have torn down and put together 100's of 6L80/90's and I noticed that most of them have a burned smell and a lot of the time, the clutches, clutch plates, drums and shafts looked a bit toasted. lol. I wonder if that has anything to do with the temperature of the transmission. Not gonna lie, we get like 100's of 6L80/90's a week esp 6L80's. Almost made me regret buying my silverado.