Transmission case is cracked - Ford Powerstroke Diesel Forum
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post #1 of 22 Old 03-06-2013, 01:24 PM Thread Starter
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Transmission case is cracked

Does anyone know if this is common, or just my bad luck? My truck has been making a vibration at 40 mph and then again at 70 mph and higher. I was thinking u joints at first. But, now I'm thinking the transmission was going out this whole time. Or is it possible that the vibe caused the transmission to break? Today when I was driving the truck, I felt a thump and then I only had the vibe at 40 mph not at 70 mph. The truck seemed to shift fine on the way home, so...... I dunno. Guess it's time to take out a transmission.....

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post #2 of 22 Old 03-06-2013, 03:42 PM Thread Starter
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post #3 of 22 Old 03-07-2013, 08:06 PM Thread Starter
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Anybody... anyone.... any ideas??? Bueller..... Bueller?!?

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post #4 of 22 Old 03-07-2013, 08:26 PM
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Jse have you checked your motor mounts? And or your rearend? Had a turbo 400 shater a case only because the motor twisted the frame on a 69 chevelle as it shifted. The driveline was too long and jamed into the tail housing stopping the rotation and boom. So with that info my theroy is with a firm shift or a broken mount it might have done it? My rig is 9200lbs and when I had JW build my tranny the shift was hard and has some what calmed down sime my DP install?

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post #5 of 22 Old 03-07-2013, 08:33 PM Thread Starter
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No, I haven't, but I'm thinking of replacing them anyway. Also, I'd replace the trans mounts, u-joints, up-pipes, and who knows what else.... or sell as is then save for something newer??? Just sucks having more time to think than money to spend......

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post #6 of 22 Old 03-13-2013, 08:34 AM
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Any sort of mistorquing may cause a cracked housing, also improper alignment to the block or overtightening of bellhousing bolts.



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post #7 of 22 Old 03-13-2013, 10:49 AM Thread Starter
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Re: Transmission case is cracked

Yeah, I'm going to replace the trans mount and u-joints etc....

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post #8 of 22 Old 03-14-2013, 09:40 PM
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Mine was cracked 180 degrees around the top half of the bellhousing. I couldnt find any reason why and threw a new one in along with flex plate, torque convertor and mounts. Its been a few months now and no problems yet.
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post #9 of 22 Old 03-14-2013, 09:46 PM Thread Starter
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Quote:
Originally Posted by Greenman01 View Post
Mine was cracked 180 degrees around the top half of the bellhousing. I couldnt find any reason why and threw a new one in along with flex plate, torque convertor and mounts. Its been a few months now and no problems yet.
Did you get your flex plate checked to see if it was bad?

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post #10 of 22 Old 03-14-2013, 10:22 PM
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A bunch of teeth were missing. Probably should've checked for cracks as well...
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