73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => 4 Wheel Drives => Topic started by: qboy on June 21, 2008, 12:28:34 am

Title: Transfer Case
Post by: qboy on June 21, 2008, 12:28:34 am

I've got a 1975 GMC K15 short bed 4x4.   How can I tell if I have an NP203 or an NP205 transfer case?

Title: Re: Transfer Case
Post by: VileZambonie on June 21, 2008, 01:39:17 am

What's your shift pattern? Look on the back of the transfer case for a tag. Is there an aluminum extension housing or is it all cast iron?

Title: Re: Transfer Case
Post by: joesgarage71 on June 21, 2008, 11:33:18 am

 If it has a drain plug its a 205
If not a 203

Title: Re: Transfer Case
Post by: blast on June 22, 2008, 10:45:28 am

Pics:  http://www.chuckschevytruckpages.com/drivetrains.html

Title: Re: Transfer Case
Post by: 87GMC2WD on June 22, 2008, 04:01:49 pm

what other kind of transfer cases are there. i dont have either of those two.

Title: Re: Transfer Case
Post by: VileZambonie on June 22, 2008, 09:09:40 pm

Did you look for the tag? Take a pic

Title: Re: Transfer Case
Post by: 76_Scottsdale on June 22, 2008, 09:32:10 pm

87GMC2WD

You may have a NP208. Check out that page to see what you have.

Title: Re: Transfer Case
Post by: Blazin on June 22, 2008, 09:59:09 pm

208s were not offered until 81, 82 ish.

Title: Re: Transfer Case
Post by: Fordeatinz71 on June 23, 2008, 07:44:29 am

yes but lets remember swaps do happen...

Title: Re: Transfer Case
Post by: Blazin on June 23, 2008, 08:06:55 am

Yes, but not useually a down grade!!!!! :P

Title: Re: Transfer Case
Post by: 87GMC2WD on June 23, 2008, 03:18:33 pm

well i have a 83 blazer and a 84 k20. the blazer i just got and is only a rolling chassis. that transfer case has a NP tag on it that i think says 203. the truck has no tag w/ 2hi 4hi n 4low.

Title: Re: Transfer Case
Post by: Donut on June 23, 2008, 06:50:57 pm

Is the transfer case alum or cast iron?

2hi 4hi n 4low.  that's the shift pattern, might be on the TC shifter knob.  The link Blast gave you helped me identify mine.

Title: Re: Transfer Case
Post by: 87GMC2WD on June 23, 2008, 08:05:38 pm

i looked at the tag again i think that it might be a 208. cleaned it with some brake clean and it looks more like an 8.
Blazin, you said the 208's are a downgrade. what is the difference and why are they worse.

Title: Re: Transfer Case
Post by: blast on June 23, 2008, 08:28:03 pm

here's a np208, does it look like this?

(http://i18.ebayimg.com/06/i/000/a5/bd/0aeb_1.JPG)

Title: Re: Transfer Case
Post by: VileZambonie on June 23, 2008, 08:49:45 pm

They're not a gear drive unit but for regular street and offroad use they're great. If you are a serious offroader not so good.

Title: Re: Transfer Case
Post by: Blazin on June 23, 2008, 11:58:33 pm

As Vile said 208's for street or mild off road / plowing they are fine, I have run many of them in my plow trucks over the years. Have 4wheeled them too. I have blown a few up. The 205 is gear driven so its heavier duty is all.

Title: Re: Transfer Case
Post by: 87GMC2WD on June 24, 2008, 06:27:43 pm

ok. thanks guys. well i got a spare so if i blow one up i got another, or ill go get a 205 from a junkyard

Title: Re: Transfer Case
Post by: Hank Hill on June 26, 2008, 10:23:43 am

My truck has over 400,000 on it and the NP208 is the only part on that whole truck that hasnt been rebuilt or replaced. I use mine off road and haul horses with it.

Title: Re: Transfer Case
Post by: 87GMC2WD on June 27, 2008, 06:15:26 am

wow. thats a lot of miles. but the 208 is the only orignal thing still going huh? ill only be using mine to plow, minor off road and to haul car trailers, so i should be ok for now, until i put a lift in it.

Title: Re: Transfer Case
Post by: Hank Hill on June 27, 2008, 09:51:37 am

Make sure you keep it full of oil. Thats what kills them. People let them run low of oil. My rear seal tends to leak. I replaced it but it still leaks a bit.
Yes the Transfer case and the body(sheet metal is still original but everything and I mean everything else has been replaced or rebuilt.