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WOW! So the torn O-Ring did it! I must have had the up-pipe cocked just slightly so it didn't seal enough to draw the fluid up. I'm relieved and my truck is happy again. Thanks for all your input! I've always been hesitant to go too far with transmission work as I'm not familiar with them. I...

Thanks for the reply! so I completely disconnected the linkage on the driver's side this time, including the bracketry for the sensor connectors, and "flipped" the linkage and that helped a lot! I also believe I found the culprit- a torn O-Ring at the top of the pickup tube!!! I must have rocked...

Thanks for the info, Gary! I'm in the process of messing with it again today. I pulled the external filter up near the front bumper and it was less an 1/4 full of fluid, giving me the idea that the transmission isn't pumping, so going back to the thought that the filter installation might be the...

Thanks for all the feedback on my issue! I messaged that past owner this morning, and found he drained and filled the transmission with Napa https://www.napaonline.com/en/p/NHF85405 Hydraulic Fluid, which has been discussed on here as being an acceptable fluid to use. Now I'm thinking the...

So much truth to that! I'm thinking I might have knocked the filter off the pickup tube or something... I'll dig into this further.

I regret not inspecting the old fluid more closely. The transmission seemed fine before I drained it so I didn't give the fluid the attention I should have. The pan had limited grayish/black residue/ sludge on the bottom after I removed it, but really no metal flakes on either the pan magnet or...

Thanks for the reply! Fingers crossed it won't need a transmission as it hasn't been run long. It was a red fluid that came out, I assume ATF was in it already, but have also heard they sometimes would dye oil red to help locate leaks? I assumed it was ATF that I drained at the time... It hasn't...

Good evening! I'm not at all knowledgeable when it comes to transmissions. I changed the internal and external filters in the Allison transmission and drained and refilled with Castrol TranSynd. I measured 3.5 gallons of fluid that I drained out after dropping the pan and external filter and...