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Old 01-29-2018, 05:38 AM   #1
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47RH Output Shaft Leak

94/95 47RH with a NP241DHD behind it. First time I started it up, it leaked between the transmission and transfer case. Pulled the case off and replaced the transmission output shaft seal with a double lipped seal, still leaks. It's a nice steady drip when the truck is running. Friend of mine said he has had the same problem with all the 47RHs and just throw sealer between the two. Is this the answer? case looks good, no cracks that I can see, and the seal fits good on the transfer case input shaft.
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2006 Dodge 2500 QCLB 4x4 Goerend 48RE

1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs
 
Old 01-29-2018, 06:49 PM   #2
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maybe speedy sleeve it
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Old 01-29-2018, 08:04 PM   #3
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Is the input on the tcase long enough?. There is a thread on here somewhere where a guy is looking for a long auto input.
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Old 01-29-2018, 08:53 PM   #4
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Did you drive the trans seal in flush or deeper? I pounded one in to deep before and t leaked. Have you slid the seal onto the t case input to check if it's the right size ?
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Old 01-30-2018, 06:27 AM   #5
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I don't know if this is any way related, but I had to change the input yoke on my t case when I went to fat output. Anyway, the new yoke didn't come with the plug in the back of it and I didnt notice it, kept transferring fluid to the t case until it overfilled it and leaked out of about everywhere it could.
 
Old 01-30-2018, 04:09 PM   #6
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I didn't know there was a plug in there. Whenever I let a tcase lay input shaft towards the floor they leak.
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Old 01-30-2018, 06:43 PM   #7
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Quote:
Originally Posted by SCHMITTY View Post
I didn't know there was a plug in there. Whenever I let a tcase lay input shaft towards the floor they leak.
There is a plug in the base of the t case input, kinda like a freeze plug. It was missing in a new replacement input to the t case and I didn't catch it.
 
Old 01-30-2018, 11:33 PM   #8
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Quote:
Originally Posted by SCHMITTY View Post
I didn't know there was a plug in there. Whenever I let a tcase lay input shaft towards the floor they leak.
Jasonc is correct. You need that plug pressed into the t-case.

Not sure if concept is the same for a 47rh.
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Old 01-31-2018, 05:59 AM   #9
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My transcase came from a 47rh, 241dld.
 
Old 01-31-2018, 10:15 AM   #10
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There is also a seal on the front yoke of the transfer case that can leak and push fluid forward.

Another piece of advice. I have had transmissions come in with this same problem, replaced the seals on both transfer case and transmission and it still leaked. Long story short, the idiot who replaced the seal before I worked on the transmission drove the old seal out from the bottom of the seal and gouged the housing whee the seal sits! Needless to say I had to replace the OD housing on the unit. Make sure yours is OK.

I also removed 2 lbs of RTV from this transmission. They could not find the leaks so they sealed it up.
 
Old 01-31-2018, 11:05 AM   #11
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My 95' had a dhd on it. I've seen a few rh with dhd t cases
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Old 02-01-2018, 06:34 AM   #12
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Quote:
Originally Posted by odieub View Post
Is the input on the tcase long enough?. There is a thread on here somewhere where a guy is looking for a long auto input.
I'll measure again, but I believe so. I want to say I measured that a year or so ago because I was going to run a clocking ring. I'll double check.

Quote:
Originally Posted by SCHMITTY View Post
Did you drive the trans seal in flush or deeper? I pounded one in to deep before and t leaked. Have you slid the seal onto the t case input to check if it's the right size ?
Nope, right at the edge of the OD housing. It fits the transfer case input shaft perfectly.

Quote:
Originally Posted by jasonc View Post
I don't know if this is any way related, but I had to change the input yoke on my t case when I went to fat output. Anyway, the new yoke didn't come with the plug in the back of it and I didnt notice it, kept transferring fluid to the t case until it overfilled it and leaked out of about everywhere it could.
I'll take a look and see.

It's annoying, I thought I had checked everything. I am almost thinking about swapping transfer cases to something with a fixed yoke on the back, but I can't fit a NP271 so I am not sure what I would run.
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Old 02-01-2018, 05:14 PM   #13
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Quote:
Originally Posted by odieub View Post
Is the input on the tcase long enough?. There is a thread on here somewhere where a guy is looking for a long auto input.
Bingo, the input barely tickles the seal. Now I need to find a longer input shaft. I think this case came out of a manual transmission truck. Makes sense if then. Always something.

Thanks!!!
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2006 Dodge 2500 QCLB 4x4 Goerend 48RE

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Old 02-01-2018, 07:47 PM   #14
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241dhd long input shaft needed.. - Competition Diesel.Com - Bringing The BEST Together

If link works here u go.
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Old 02-02-2018, 06:11 AM   #15
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Quote:
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Thanks, I didn't realize Dodge could screw this up so good.
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2006 Dodge 2500 QCLB 4x4 Goerend 48RE

1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs
 
Old 02-02-2018, 11:18 AM   #16
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Damn I snagged a used dhd off a 24v for a 94 12 valve /47rh dump truck project. I wanted the dhd so I can run a pto for the dump bed. I grabbed the matching drive line yoke. Now I have to go measure my parts.
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Old 02-02-2018, 11:30 AM   #17
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Sure enough the input on the t case is too short. Just measured it with a straight edge and some calipers.
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Old 02-02-2018, 11:31 AM   #18
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I'm glad I followed this thread I would have been scratching my head this summer
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Old 07-23-2018, 09:32 AM   #19
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For future reference, you will need an adapter to push the seal back so it engages fully on the input shaft of the transfer case. I modified one I had laying around so it is 0.420" thick. Works great.

Click the image to open in full size.

Click the image to open in full size.
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