How does a 465/208 setup seal itself?

[Hogback Fabrication]

No threads for a seal housing on the 465 output

No machined spot for a seal in the adapter

So does oil fill the adapter and rely on the gasket between the trans and adapter to keep oil in? Of course there's a seal on the t-case input but I would have thought there would be one on the trans output too.

 

[cegusman]

Yes fluid fills the adaptor and gets stoped by the tcase input seal. Thats how mine is from the sm465 to np203 or np205.

 

[Mr. Pickle]

If no seal, what about RTV? (I am probably sure you thought of that)

 

[Hogback Fabrication]

Yes fluid fills the adaptor and gets stoped by the tcase input seal. Thats how mine is from the sm465 to np203 or np205.

My current 465/205 (10 spline) just has a seal in the adapter to keep the fluid seperate, neither the trans or t-case had a seal.

Are you saying that the later 465/205's (32 spline) had only a seal at the t-case input and sealed the adapter with gaskets/RTV?

 

[Hogback Fabrication]

If no seal, what about RTV? (I am probably sure you thought of that)

Yep, and that's what I'll do if somebody can confirm that there is no seal there.

 

[dbreid]

I had the same question when I did my doubler.

Here's what was in my truck when I pulled the 205 (465/205):

I decided goopey RTV was lame, so I bought a sheet of cork gasket material and hand cut myself a nice gasket. Worked perfectly!

-Dan

 

[Hogback Fabrication]

I had the same question when I did my doubler.

Here's what was in my truck when I pulled the 205 (465/205):

I decided goopey RTV was lame, so I bought a sheet of cork gasket material and hand cut myself a nice gasket. Worked perfectly!

-Dan

Yeah, but that's a 10 spline 465/205. I already had that setup in my truck and I know how that seals.

 

[dyeager535]

Huh. Pretty certain my 32 spline 465/205 uses a double lip seal (or two) in the adapter, and it certainly uses gaskets on either end, since the adapter gasket is used to keep it from "bottoming out" on the transmission bearing IIRC.

 

[michaelgilitiuk]

did you t case come with the front driveshaft that has four bolts that bolt it to the case. mine has the u bolt that holds it to the case like my rear drive shaft i want what u have were can i get that

 

[dyeager535]

'85-87 parts manual shows a "SEAL, input drive gear" on the 208, and the same piece on a 205.

Adapter picture doesn't show the manual trans variant(??) but it does not show any internal seals, only the front and rear gaskets. Of course, the front one is called a seal, the rear a gasket even though they do the same thing, for only reasons GM knows.

 

[bp71k5]

If it helps, my 465 to 203 adaptor looked very similar in that there was no apparent place for a seal on the adaptor itself.

In fact, I believe the half-moon shaped cutout on the adaptor and 465 is so lube can get past the bearing. Maybe the seal in the 205 needs a little lube to stay flexible?

 

[scouthead]

1988 s465 that had a 208 attached to it. I hate that there is no seal on the back of my tranny. The adapter fills with gear lube - maybe a quart? makes a real mess when the T.C. come off. Makes me worry that the fluid level n the tranny will rop when the adapte fills, but I'm affraid to fill it again, because I used to have problems with lube oozing out of my shift tower when I was offroad (long downhill run allowed the adapter oil back into the tranny and then overfull?). I have seen other 465s that had a rear seal, so why can't mine? You would think that having a tranny and T.C. that used different oils, you would like to keep things seperated better. Makes sealing a clocking ring a lot of fun - wait no it wasn't.

 

[cdoggwsu]

Makes me worry that the fluid level n the tranny will rop when the adapte fills, but I'm affraid to fill it again, because I used to have problems with lube oozing out of my shift tower when I was offroad.

If you're filling the tranny on level ground, shouldn't the adapter and case fill at the same time? I'm about to tackle this myself as my '88 465/208 is leaking at the adapter (tranny side, tc side is fine), and from what looks like every mating surface on the tranny - pto covers even after new gaskets, top cover and what looks like up around the bellhousing, although that could just be leaking from the top cause the clutch feels fine. The leaking is very slow, just a few drips a week maybe, but the entire tranny looks 'wet' all the time.

 

[broncoman6524]

I just put my 465/208 back together. There is no seal on the back of the trans, or on the adapter. Just the input shaft seal on the case to keep the ATF and the gear oil seperate.

I just ran RTV over everything, and onto the bolts before I put them in. No weeps from my stuff.