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Old 04-16-2009, 08:45 PM   #1 (permalink)
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NV4500 leaks

Hey Y'all,

Here's my situation:

I have a brand new 92-94 early style GM NV4500 4x4 version transmission. It is bolted up to a hybrid fixed yoke NP208 and has a DIY4X clocking ring in-between.

Yesterday, I started my truck for the first time with the transmission installed. Immediately, Syntorq fluid began heavily dripping from where the clocking ring meets the t-case.

I don't understand why the NV4500 would leak, so I called my builder and he explained to me that the entire adapter fills up with Syntorq. I knew that the 5th gear overdrive which is contained inside the forward area of the housing gets oiled, but I didn't think that the output shaft area after the retainer was supposed to fill up. Here's a picture of the area which I am questioning:



When I pulled the BW1356 off my core, there was no Syntorq in there. What gives? I'm having a hard time accepting this as normal. I'm not aware of the NV4500 and t-cases sharing oil.

I have found that all models, Dodge and GM, except the 4x4 GM version have rear output seals. WTF?

Please help.

Thanks,

Manny
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Old 04-17-2009, 10:50 AM   #2 (permalink)
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I ran into this with mine, different t-case but same senario and I have a seal on mine. Had to use black RTV on the clocking ring (both sides) and the studs. No leaking now.
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Old 04-17-2009, 10:51 AM   #3 (permalink)
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Fluid gets thrown up in that cavity but shouldn't stay there. Did you have the Tcase in when you started the truck? The countershaft rotates all the time (I think??)in the bottom of the case, even in neutral ,just off of the parasitic drag though. So it could throw fluid up there and leak if the tcase wasn't in yet.
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Old 04-17-2009, 02:05 PM   #4 (permalink)
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ive got a nv4500 - 205 in my cummins .... silicone that sucker thats what i did.

mine doesnt leak , well it does but thats not the point here.

the silicone works
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