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th350 - np205 adapter seals

wazzabie

wazzabie

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Can anyone clarify the seals I need on the adapter from a T350 to an NP205 1971 or 1972.

Also is there a pre 1970 adapter that uses bearings?

Here is some info I found on the web... just wanted it verified.

Yes, there are 4 peices.

one o-ring on the input shaft that is INSIDE the coupler between the trans and transfer case on the transfer case side.

one square o-ring on the transmission side, seals to the adapter.

two seals that are to be placed inside the adapter, with or without support bearing, that are set in such a way as to keep fluid out from either side. these are to be butted up against each other.
 
That is correct, are you looking for the seal part numbers?

I had a 1969 NP205 out of a GMC Jimmy and it did not have bearings in the adapter but it was a side shift 3 speed model. 1969 NP205s are really rare.
 
020-2.jpg


022-1.jpg
 
GreenieK30 said:
That is correct, are you looking for the seal part numbers?

I had a 1969 NP205 out of a GMC Jimmy and it did not have bearings in the adapter but it was a side shift 3 speed model. 1969 NP205s are really rare.
Click to expand...
Ahhhhh yes! I bought an '80 SWB K10 once with the 10 spline 205 behind the 3 speed of which was a column-shift type. Looked exactly like the car trannys.

The adaptor was different than the other common setups. I had one I got off eBay for cheap but resold it out as it was nothing but dead weight. I can't remember any seals, etc. in it since it was covered up with grease.
 
As for the 350/205 adaptor, there are 2 types of which have been discussed already.

The way I've seen them, from past dismantling experience, the bearing type is the 1st Design and the 2-seal type is the 2nd Design.

Which is stronger? I have no clue. I've only driven 3 or 4 trucks in my lifetime with the 350/205 combo and all were the 2-seal types. I've just never gotten a chance to own and drive an older rig, namely a 1st Design truck.

I'd like to say the bearing type would be stronger because of the bearing obviously. But then you think about the 2nd Design with the 2 seals and wonder why GM changed the adaptor to that. The engineers must know something we don't in order to remove the bearing and add a seal in place of it.
 
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