Keith Browning Posted November 9, 2013 Share Posted November 9, 2013 We just had a 4R100 bolted to a 7.3L come through with the case split in two at the converter housing across the fluid pump area. The engine vibrated badly but the trans still worked and the truck was still drivable. Long story short the torque converter came apart internally. I have never seen that. I could pick it up off of the bench, shake it and feel a heavy thump Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted November 9, 2013 Share Posted November 9, 2013 Pattern failure on 99-2000s IIRC, there was a TSB or SSM on it. What year? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted November 9, 2013 Author Share Posted November 9, 2013 I don't recall the year as I was not working on it but I think you are referring to the noisy converter TSB. I did not mention that this was a Ford reman transmission and converter but it was and the guy was lucky as hell as the warranty on the unit ended within days of the failure. Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted November 9, 2013 Share Posted November 9, 2013 You're right, I'm old. My mind is mush...... Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted November 10, 2013 Author Share Posted November 10, 2013 You're right, I'm old. My mind is mush...... Eh - dude you have so much knowledge in that skull of yours it must be hard to keep track of it at times! Quote Link to comment Share on other sites More sharing options...
ktmlew Posted November 10, 2013 Share Posted November 10, 2013 Had a buddy shop owner that had a Chevy box truck that had broken the case through the bellhousing several times. Being the curious type I went to look at it...the two-piece driveshaft was splined out-of-phase...DOH! Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted November 10, 2013 Author Share Posted November 10, 2013 Funny you mention that - Hot Line told us to check for u-joints which were in fact new but the converter was definitely the problem. Until now I never thought a driveshaft could do that to the front end of a trans but I guess it can. I would think the rear of the trans would be more likely... Quote Link to comment Share on other sites More sharing options...
Aaron Posted November 10, 2013 Share Posted November 10, 2013 This is an extreme example, but during a universal joint failure in a drag racing application I would say 99/100 times the trans case breaks at the front as well. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted November 10, 2013 Share Posted November 10, 2013 U joints are the devil !!! 1 Quote Link to comment Share on other sites More sharing options...
Aaron Posted November 10, 2013 Share Posted November 10, 2013 Quote Link to comment Share on other sites More sharing options...
Alex Bruene Posted November 11, 2013 Share Posted November 11, 2013 I've seen 3 transfer cases completely destroyed in the past year and a half. They were all on vehicles that were being driven in 2wd with the front hubs engaged. The DC joint on the front shaft would fail, then destroy the transfer case from the vibrations. Quote Link to comment Share on other sites More sharing options...
amailloux Posted November 11, 2013 Share Posted November 11, 2013 I had a pile of 5 front shaft as 1 fleet instructed their drivers to keep the hubs locked in all the time. Only 1 destroyed the t-case. I unlocked the hubs every Time I saw 1 of these trucks. I could unlock them, but the drivers couldn't. Quote Link to comment Share on other sites More sharing options...
batmantech Posted November 11, 2013 Share Posted November 11, 2013 We had a f-350 break the trans case across the top, Caused by the front shaft u-joint worn and vibrating. Quote Link to comment Share on other sites More sharing options...
lmorris Posted November 12, 2013 Share Posted November 12, 2013 We had a f-350 break the case across the top, Cause by the front shaft u-joint worn and vibrating. We see those on a regular basis, mostly from the front hub seals failing and the front hubs stay locked in. They get up to highway speeds and BOOM. What a mess. We have 2 fleets that stock a few of their own t-cases and send them down with the trucks. Quote Link to comment Share on other sites More sharing options...
mrbudge Posted November 12, 2013 Share Posted November 12, 2013 When I was at NVH classroom course, on the course before mine, the instructor broke the extension housing off of a trans by introducing a driveshaft vibration. He wanted to make is bad enough that the EVA would easily pick it up. For the next class the induced vibration was much less severe. Quote Link to comment Share on other sites More sharing options...
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