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Hey everybody, I'm in a 1997 GMC Sierra K1500 single cab short box. Within the last 30,000 miles, I have gone through three transmissions. All of these have cracked between the pan and the transfer case adapter. I'm looking for any insight on what is causing this issue. The crack is located in the same place each time. The truck has had the motor mounts replaced and the transmission mount, along with the u joints, are also new. The transfer case has been looked at. The truck has no lift and the torsion bars are adjusted slightly up. They are nowhere near maxed out. Thanks in advance.
 

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Is your frame bent? A buddy of mine was cracking his in a 2000 Silverado and after looking closer the frame was bent.
 

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I also want to add that bad ujoints can cause transmission cracks. The vibrations of the driveshaft do it. Gotta remember trans is just cast aluminum, they crack all the time. I believe this or lack of support rods may be your issue.
 
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