C-6 trans case cracked!!
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Freshman User
Joined: Feb 2011
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C-6 trans case cracked!!
Hi i have a 1981 F250 with a 351m, C-6 big block trans and a BW1345 Tcase. Today i lifted the cab off the truck, took off the tcase and trans. when i was taking the bolts out of the trans from the engine the 2 top pieces were broken off the tranny where the bolts go threw.. (2 top bell housing bolts). they are a clean cut off like a fracture.. i still have the pieces for them.. as i was taking the tcase out i noticed that the trans mounts were very bad like marshmollows.. im wondering if anybody had heard of this? but my real question is, what material is the trans case made of. cast, steel aluminum? i really cant tell seems like a white metal to me.. im wondering this so i can weld them back on.. thanks!!
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
Good luck its cast aluminum and welding it will be near impossible. Most of the time the top two bolt holes crack when someone tightens only the top bolts trying to install the transmission pulling it closer to the engine.
Cargo Master
Joined: Aug 2007
Posts: 2,560
Likes: 69
From: New Zealand
It's not difficult to weld aluminum (& most aluminum alloys) with tig, or a mig welder set up for aluminum - unlike doing it with arc or oxyacetylene, as in the old days.
But you will need to be very careful to check that the front face is flat after the repair - neither higher or lower than the rest of the bellhousing surface - or it will be likely to break again.
But you will need to be very careful to check that the front face is flat after the repair - neither higher or lower than the rest of the bellhousing surface - or it will be likely to break again.
Cargo Master
Joined: Mar 2007
Posts: 2,935
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From: Arcadia, Fla
With a busted bellhousing, the starter aligment will be off and you will eat up starters and flex plates. What caused the bellhousing to bust up is the bad tranny/engine mounts. Seen this before and a 300 I6 and a C6 tranny,
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Joined: Jan 2001
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From: Virginia
What scares me is you said "you are going to try it" and see what happens. I haven't welded aluminum too much, but what i have welded didn't turn out too well. I get the impression you have to practice a little bit before you get good at welding aluminum.
I applaud you for wanting to try it, but I think I would hunt around for a shop who has someone who is experienced at welding aluminum. This is going to be something you are not going to want to mess up, because you probably can make it bad enough where someone else won't be able to fix it.
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Hotshot
Joined: Feb 2004
Posts: 11,697
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From: Marengo, Iowa
I had my cousin tig one a long time ago when I got a lesson about seating the converter all the way in. He welds it regularly though, and had the proper equipment for it. Not something I would do as a beginner.
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