Tranny to transfer case snapped - JeepForum.com
 
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post #1 of 12 Old 06-06-2020, 11:48 AM Thread Starter
CJPondScum
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Tranny to transfer case snapped

Good morning!

Went wheeling this week and my twin stick started popping out of gear. Looked underneath and sure enough the the transmission cracked/broke where it bolts into the transfer case. See pic. Does this mean I need to replace the tranny? What causes that? Ugh

Thanks Kevin

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Kevin
1983 CJ7 - PondScum
360 TH400
35's 4:56
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post #2 of 12 Old 06-06-2020, 12:21 PM
John Strenk
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What transmission/ transfer case are you running?

It could be the adapter plate that needs to be replaced.


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post #3 of 12 Old 06-06-2020, 12:30 PM
oldschool74cj5
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hello

not that you will need a whole new transmission but will need a new tailhousing or adapter. since its a th400 to a dana 300 its probably a advance adapters or novak. amc used the th400 with dana 20's. the best thing is clean it all up and hopefully see whos it is. normally advance adapters cast a AA in theres. once you know who's it is you should be able to buy a replacement tailhousing adapter. you should be able to unbolt the adapter and bolt a new one in once you knows whos it was made from.

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post #4 of 12 Old 06-06-2020, 12:34 PM Thread Starter
CJPondScum
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Nice thank you! Didn't even think about there being an adaptor there. I will check it out

Kevin
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post #5 of 12 Old 06-10-2020, 08:34 PM
brianscoob
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Garage
It might even have a warranty on it or a lifetime guarantee on it. I'm sure that ruined your weekend as that's a nasty one, hopefully you got home okay!
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post #6 of 12 Old 06-11-2020, 01:38 AM
whodatschrome
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I broke the adapter between my T5 and D300 years ago. A shackle reversal, too long of a front driveshaft, and a sweet jump all contributed to the big POP. A replacement adapter (and a shorter front driveshaft) was all it took to fix.
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post #7 of 12 Old 09-17-2020, 10:16 PM Thread Starter
CJPondScum
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Update... Pics of the broken Advance Adapter. Just got the replacement in and ready to bolt up the transfer case!

Funny enough the hardest part was removing the drive shaft as all the u-joint strap bolts we're completely rounded off and took forever to get them out!
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Kevin
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post #8 of 12 Old 09-18-2020, 09:20 AM
jeepster4245
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Just curious about what you were doing to possibly cause that to occur?
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post #9 of 12 Old 09-19-2020, 10:53 AM Thread Starter
CJPondScum
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We were rock crawling but there was no indication of an issue until I got off the trail and to the highway... Right when I was going to stop and air up, unlock the hubs etc it kicked out of 4 hi and wouldn't go back in. Advance Adapters asked me the same thing, he hadn't seen that happen before he said.

Kevin
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360 TH400
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post #10 of 12 Old 09-19-2020, 10:55 AM Thread Starter
CJPondScum
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How did you figure out your front drive shaft was too long? Is there any indications I should look for? I have been wheeling it for about 6 years now and this is the first issue with the transfer case/adapter.

Kevin
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post #11 of 12 Old 09-19-2020, 11:27 AM
Fourtrail
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Quote:
Originally Posted by CJPondScum View Post
How did you figure out your front drive shaft was too long? Is there any indications I should look for? I have been wheeling it for about 6 years now and this is the first issue with the transfer case/adapter.

Easiest is a zip tie on the slip joint and see how close the slip comes to completelty compressing after a day of intermidiate wheeling. reverse shackle will make the axle move back a greater amount than a front shackle and that is when tcases and adapters get busted.

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post #12 of 12 Old 09-19-2020, 06:21 PM
John Strenk
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I had a friend of mine do the shackle reversal on his CJ,

Turns out on a normal CJ shackle set up the axle moves forward when the springs are compressed, with a shackle reversal the axle moves backwards ramming his drive shaft into the t-case.
In his case it cracked his front output housing on the t-case up. Had to get a different driveshaft. I think Tom Woods helped him figure the right on.

Imagine the force on that adapter everytime your springs collapse and rams your drive shaft into the t-case


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