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Unread 12-04-2013, 10:33 PM   #1
91YJ-98TJ
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Can a transmission be welded?

I went to check my transmission fluid, and the fill plug was pretty tuff to get off, so topped it off and went to put the plug back in, and being a dumb *** figured it should go on just as tight as it was getting it off and I broke of the top part of the threaded hole where the plug goes in. I keep trying to post pics but there too large. So can this be welded or what do I do from here?

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Unread 12-04-2013, 11:10 PM   #2
SeanB95YJ
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the material is (or SHOULD be) cast aluminum... it CAN be welded, but from my experience, would need to be TIG welded by a pro.

Whether or not YOUR particular break can be repaired I guess would depend on the extent of damage and the location. Only thing I can suggest would be to drain it, remove it and bring it to a good welding shop and ask them.

Good luck
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Unread 12-04-2013, 11:29 PM   #3
baktie_91YJ
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Its either cast aluminum or cast magnesium, dont remember which, both of which can be TIG welded. Unless you have a nice TIG setup and are extremely comfortable doing it then I would bring it to a shop
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Unread 12-05-2013, 07:34 AM   #4
tom_sprecher
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Even when you try to TIG cast aluminum it is almost impossible to clean it enough to keep worn holes from forming while welding it. Ask me how I know.
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Unread 12-05-2013, 10:22 AM   #5
superj
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liquid metal it, ha ha ha. sometimes that works for stuff, and sometimes not. just depends on the stresses that area of the transmission deals with
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Unread 12-05-2013, 01:22 PM   #6
91YJ-98TJ
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Thanks everyone. I've asked around town and a few people recommended the same guy, but when I went by he hasn't been there. I figure if he doesn't feel confident doing it just trying jb weld and hoping for the best because either way I'm looking at a new transmission. Right?

Think I probably ended up cracking it when taking the plug out since I did have to use a breaker bar and then just realized what happened when I tried to tighten it.
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Unread 12-05-2013, 03:00 PM   #7
Steve707
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If its aluminum you'll need a high frequency machine to weld it.
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Unread 12-05-2013, 09:40 PM   #8
nzpete
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Quote:
Originally Posted by Steve707 View Post
If its aluminum you'll need a high frequency machine to weld it.
What is a high frequency machine?
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Unread 12-06-2013, 07:01 AM   #9
Steve707
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Quote:
Originally Posted by nzpete View Post
What is a high frequency machine?
It'll weld AC and not just DC.
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Unread 12-06-2013, 07:19 AM   #10
bigbossd1030
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Of your tranny was in nice shape, can I suggest getting a used one from a JY, having it gutted and put your parts inside. Or get a used one and when the gears give er, swap yours in. Just an idea,
Should be cheaper than a reman or a new one.
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Unread 12-06-2013, 07:46 AM   #11
nzpete
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Quote:
Originally Posted by Steve707 View Post
It'll weld AC and not just DC.
Most stick welders are AC.
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Unread 12-06-2013, 08:02 AM   #12
Steve707
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Quote:
Originally Posted by nzpete View Post
Most stick welders are AC.
You plug them in to AC outlets, but you don't weld steel with AC. Stick welding is DC+.
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Unread 12-06-2013, 08:26 AM   #13
willawolfe
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Why not get a new trans on cl or junk yard. Aside from your labor it may cost same as paying someone who might be able to fix it
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Unread 12-06-2013, 10:31 AM   #14
fishadventure
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A photo of the break would be handy. Welding will work but you won't do that with a stick welder... Go to a pro welding shop as suggested.

However, what *I* would do is find a "core" or otherwise blown up/free/cheap tranny and just swap the cases.
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Unread 12-06-2013, 02:25 PM   #15
Norcal_chris
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Quote:
Originally Posted by Steve707 View Post
You plug them in to AC outlets, but you don't weld steel with AC. Stick welding is DC+.
Um what?

A standard transformer-based arc welder nearly always produces AC output. DC is the perferred method for welding , but tons of people weld steel with AC output buzz boxes



I welded up my transfer case that was halfway cracked and the ears broken off with a Mig Spool gun setup for AL. Worked awesome.
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