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Old 09-10-2009, 01:24 PM
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np208 transfercase

I have a 1973 chevy 4x4 4 speed manual tranny 350 engine, the transfer case is shot (its an np208) and i was wondering if a 208 out of an 86 chev with a th400 transmission will bolt up to my standard or if ill need some kind of adapter. Any help is much appreciated.

Thanks
Cody

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Old 09-10-2009, 01:38 PM
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I think the spline count on the output shafts are different from a 350 to a 400 but not sure
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Old 09-10-2009, 02:20 PM
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Quote:
Originally Posted by Codyw
I have a 1973 chevy 4x4 4 speed manual tranny 350 engine, the transfer case is shot (its an np208) and i was wondering if a 208 out of an 86 chev with a th400 transmission will bolt up to my standard or if ill need some kind of adapter. Any help is much appreciated.

Thanks
Cody
Are you sure you have a 208? Or did someone transplant it in there?
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Old 09-10-2009, 04:20 PM
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I thought trucks of that year had a 203 tranfer case made of cast iron? Is thanfer case have an aluminum case or cast iron?
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Old 09-10-2009, 06:50 PM
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The guy i bought it off of said it was a 208 but it could b a 203 im not 100% sure, if it turns out to b a 203 is it possible to put a 208 or a 205 in?
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Old 09-10-2009, 09:19 PM
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Both should be 32 spline
Shane
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Old 09-11-2009, 12:59 AM
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Quote:
Originally Posted by Codyw
I have a 1973 chevy 4x4 4 speed manual tranny 350 engine, the transfer case is shot (its an np208) and i was wondering if a 208 out of an 86 chev with a th400 transmission will bolt up to my standard or if ill need some kind of adapter. Any help is much appreciated.

Thanks
Cody
Maybe. The 400 spline count is 32 splines. If your standard has 32 output splines it should work.

Edit:

1973 Chev with a 350 engine came only with NP205, NP203, or Dana 20 transfer cases.

Last edited by mmerlinn; 09-11-2009 at 01:06 AM. Reason: Addendum
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Old 09-11-2009, 08:40 AM
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I re-read the original post. Your 4 speed will have very course splines maybe 10 and the transfer case from a auto transmission will have fine splines 32.
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Old 09-11-2009, 02:58 PM
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Is there some type of conversion kit available for the swap?
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Old 09-11-2009, 10:35 PM
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Quote:
Originally Posted by BBCMudbogger
I re-read the original post. Your 4 speed will have very course splines maybe 10 and the transfer case from a auto transmission will have fine splines 32.
If its a 208 it should have the adapter spacer.
Shane
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Old 09-12-2009, 06:41 AM
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In reading and responding to your other post here in the transmission and rearend forum, you state you have a manual transmission, in a 1973 GM truck.

Given those 2 facts, your transfer case should have ONLY been either a Dana 20 or a New Process 205.

Just out of curiousity, what makes you think the transfer case is bad in your truck?
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Old 09-12-2009, 09:34 PM
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its not transfering power to the font driveshaft and it makes a bad grinding noise when its in 4h or 4L, but it does work fine when its not in 4wd
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Old 09-12-2009, 10:34 PM
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You just may have the NP203 and have a broken chain.What kind of shift linkage is on your's? If you have a 203 you should have a 2L setting. shifter all the forward towards dash is 4L,Then 2L N 2H 4H.

If it is a Dana or a 205 you could try and shift the fork by hand to see if it will go in.You may have a broken shift fork.

Last edited by prostreet6t9; 09-12-2009 at 10:41 PM.
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Old 09-14-2009, 01:22 PM
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i got underneith the truck and scraped all the muck off the t case and the tage says its a new process gear 208, the shift pattern is 2H N 4H 4L (over to the right and down)
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Old 09-14-2009, 02:31 PM
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Quote:
Originally Posted by Codyw
i got underneith the truck and scraped all the muck off the t case and the tage says its a new process gear 208, the shift pattern is 2H N 4H 4L (over to the right and down)
Is the T/C all aluminum????
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