Hello, it's tough to say exactly what happened, it could be something to do with the transmission, more likely than a Torque Converter failure would be the Flex Plate that the Converter bolts to. When they break, it breaks off the end of the Crankshaft and the center part of the Flex Plate will stay bolted to the Crankshaft and the outer part will break free and just sit there still bolted to the Torque Converter, but you won't be able to start the truck, because the outer part of the Flex Plate has the teeth that the Starter Motor engages to. So, the starter will just spin the outer case of the Torque converter, plus a bunch of noise from the broken edges just spinning around and banging into everything. I believe there is a small access plate to get to the Torque converter bolts, but I think they are very difficult to get to, I think there is possibly a transmission support that needs to come down. Unfortunately, the Starter Motor on these trucks is under the Intake Manifold, so it's not one you could just drop out to inspect the Flex Plate, it's a pretty major failure if that's what you believe happened. You could try turning the engine over by hand with a socket and large bar on the Crankshaft harmonic balancer. See if you can identify where any of the noises are coming from. Because even if it was a transmission failure, you would still be able to start the truck, so I think that's going to be the big factor here.
Here is a video showing how they break in the center and fracture all the way around. Due to where the Starter Motor is located in this truck, I don't think it will start if the Flex Plate lets go altogether. But let us know what you find.
https://www.youtube.com/watch?v=u2I21GZ3DQE
https://www.2carpros.com/articles/how-flexplates-work
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Sunday, July 3rd, 2022 AT 7:30 PM
