Question about transfer case - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Yukon Jack** · 12-24-2002, 10:36 AM

The transfer case adapter I will be using has a fair amount of surface rust and pitting on the area that mates to the transfer case. It appears that there is normally just a very, very thin gasket used in this location.

I don't believe the adapter holds any gear oil so I'm guessing that having that surface completely clean and smooth is not critical.

Is that correct?

My72Cheyenne · 12-24-2002, 12:29 PM

If you're mating this adapter to an automatic transmission, there is some fluid that will enter this coupling. If you'll notice, there are 2 oil seals in the adapter. There is a reason for this. A small amount of ATF will be kept from passing through to the transfer case by these seals, and keep it from leaking out of the adapter by that large "O" ring on the flange of the adapter where it mates to the transmission. I just rebuilt my 205 and put new seals in this adapter last week, so the info is fresh in my brain. Good luck.
Tom

**Yukon Jack** · 12-24-2002, 12:39 PM

It's mating to a 4 speed manual and I did get new seals for it and the Rockwell T-221 so sounds like I will be okay, I will try to clean it up a bit, but won't spend to much time. Thanks

barn9 · 12-24-2002, 12:54 PM

Hey Mark, Merry Christmas to you, the wifey, and the girls!
How's the project going? Hope you got a chance to take advantage of the nice weather last week. Did you get the spot fixed by the kick panel? Thought any more about paint while it's apart (Jason and I promised we would keep trying to talk you into it you know)? Enjoy the "White Christmas" nature has provided us, later, LB.

**Yukon Jack** · 12-24-2002, 01:02 PM

Merry Christmas to you also. I got the transfer case cleaned up last weekend along with some other brackets. Hope to get the cab pulled over the holiday and get it to my friend to fix a couple problem areas.

Paint, who needs paint! Nah, can't do a real paint job right now, just too short on cash and I want it back together NOW!!!

A few can's of olive drab just might hit it while it's apart to get it one color - who knows.

HeavyK20 · 12-24-2002, 01:05 PM

Not sure on the Rockwell until I get it apart, but on the 465/205 setup that area does see oil. The transmission does not have a seal on the rear of the mainshaft and hole in the adapter for the coupling goes straight through to the transfer case.

12-24-2002, 10:36 AM	#1
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Question about transfer case The transfer case adapter I will be using has a fair amount of surface rust and pitting on the area that mates to the transfer case. It appears that there is normally just a very, very thin gasket used in this location. I don't believe the adapter holds any gear oil so I'm guessing that having that surface completely clean and smooth is not critical. Is that correct? __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-24-2002, 12:29 PM	#2
My72Cheyenne "Work in Progress" Join Date: Dec 2002 Location: Bend, Oregon Posts: 55	If you're mating this adapter to an automatic transmission, there is some fluid that will enter this coupling. If you'll notice, there are 2 oil seals in the adapter. There is a reason for this. A small amount of ATF will be kept from passing through to the transfer case by these seals, and keep it from leaking out of the adapter by that large "O" ring on the flange of the adapter where it mates to the transmission. I just rebuilt my 205 and put new seals in this adapter last week, so the info is fresh in my brain. Good luck. Tom __________________ 72 Cheyenne 4x4, 350, th350, np205, factory air, tach, headliner, tilt

12-24-2002, 12:39 PM	#3
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	It's mating to a 4 speed manual and I did get new seals for it and the Rockwell T-221 so sounds like I will be okay, I will try to clean it up a bit, but won't spend to much time. Thanks __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-24-2002, 12:54 PM	#4
barn9 Half a bubble off! Join Date: Jun 2000 Location: Winfield, Ks, USA Posts: 5,588	Hey Mark, Merry Christmas to you, the wifey, and the girls! How's the project going? Hope you got a chance to take advantage of the nice weather last week. Did you get the spot fixed by the kick panel? Thought any more about paint while it's apart (Jason and I promised we would keep trying to talk you into it you know)? Enjoy the "White Christmas" nature has provided us, later, LB. __________________ Just call me LB. '71 Cheyenne, 402BB, hauls blondes, brunettes, or redheads.

12-24-2002, 01:02 PM	#5
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Merry Christmas to you also. I got the transfer case cleaned up last weekend along with some other brackets. Hope to get the cab pulled over the holiday and get it to my friend to fix a couple problem areas. Paint, who needs paint! Nah, can't do a real paint job right now, just too short on cash and I want it back together NOW!!! A few can's of olive drab just might hit it while it's apart to get it one color - who knows. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-24-2002, 01:05 PM	#6
HeavyK20 Registered User Join Date: Dec 2001 Location: New Richmond, WI Posts: 547	Not sure on the Rockwell until I get it apart, but on the 465/205 setup that area does see oil. The transmission does not have a seal on the rear of the mainshaft and hole in the adapter for the coupling goes straight through to the transfer case. __________________ Eric 1969 K20, 465/205 package



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