Tranny / tcase problem
Hi all,
my friend has a '71 GMC K1500, 400 sbc, sm465 trans and 205 t-case. Yesterday, the housing between the tranny and t-case split wide open. The trans is still in place but the transfer case is barely hanging on (just by the side mount that bolts to the frame). Has anyone ever seen this before? Does anyone make a replacement housing? It is too dark for good pictures but it's a mess! Thanks for any input, Colby. |
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I have a 465/205 adapter that you can have for free. Just pay the ride. This adapter is also from a ’71 or ’72 and must have had a small crack as it has been welded. I used it for 10 years without issues and became a shop ornament once I swapped in the NV4500. PM if you want it. I shipped a TH350/205 adapter a while back and the shipping was around $40. PM if you are interested and I’ll get you some pictures of the weld job. '78....no holes drilled in the tcase http://farm6.static.flickr.com/5244/...9d597bf8_b.jpg |
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I'm confused! what is it that causes the torque bracket to put more stress on the tailhousing. The only thing I can think of is if you had a broken motor mount or something. Please help me understand this. Frame flex?
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Thanks for the info dirty larry, never heard that before....just another day of learning hanging around
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I'm guilty of this myself...I had no trouble or leaks till I replaced my soft worn rubber transmission and transfer case mounts with poly, allowing virtually no movement at all. It didnt take long to develop a nasty leak from a crack in the adapter.
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Thanks Larry! It makes sense to me now and Blazerman just confirmed it!
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Thanks for the info guys, looks like I will be removing the bracket I fabbed because I thought it was missing. My drive train came out of a 74, xfer had the holes drilled and tapped. I drove it for 15 years without one with no problems (did have the engine chained to the frame on drivers side to limit torque) but thought I would make it "correct" this time.
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That bracket/mount also has rubber bushings? My truck did not have one but I added one during my"rebuild". Sounds like maybe I should take it off....
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This is some good info!
I just placed a NP205 in my 68 burb and was about to drill new holes in the frame for the mount. The truck original came with a NP203 and the mount is in a different location along the frame = 4 less holes to drill and less parts to deal with. |
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Hey Larry;
Did you fab up a rod or something that ties the transfer case to the bellhousing for extra support or is it OK not to have anything other than the mounts on the crossmember? Opinions? Thanks |
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http://farm6.static.flickr.com/5170/...067286ee_b.jpg http://farm6.static.flickr.com/5290/...79130148_b.jpg |
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What an interesting thread - when I swapped in an NP205 into my 70 Blazer in place of the broken Dana 20, the side bracket didn't fit and I've been meaning to get around to modifying it or making a new one - now I can forget about doing that. Procrastination paid off!
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Yukon, that is funny....procrastination pays off, maybe not, ill want till tomorrow to find out
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I've got a 700R4 in my '72 K2500. It only has 4 bolts holding the adapter on the transmission. Will that be sufficient to hold it without the side bracket or do I need a brace rod from the bell housing?
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No way. The side bracket creates more problems that it saves, which is why GM quit using on trucks build after ‘72. That is information straight from a retired GM truck engineer. The support rod between the tcase and trans bellhousing is not a bad idea to add but still not required. |
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What year vehicle should I look for in the junk yard? I'll get the brace rod just to be safe.
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DirtyLarry you can call BS, but this is the voice of experience. I shatter my trans casing and that was with the frame attachment. I was just giving my two cents.
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The frame bracket does not allow the transfer case to flex and thus either breaking the case or the adapter most usually if it were mine i would get rid of it
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