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73-87 Chevy _ GMC Trucks => 4 Wheel Drives => Topic started by: whiskeybent on May 10, 2009, 12:34:37 am

Title: th400/203 to sm465/205 swap
Post by: whiskeybent on May 10, 2009, 12:34:37 am
I have a 84 K-20 350  with 400/203, thinking of swapping to sm465/205  will the transfer case adapter on the th400/203 work on the sm465/205? how much longer are the front driveshafts? anyone know of any online junkyards or part sites that would have the 2 shafts or adapter if needed.
Title: Re: th400/203 to sm465/205 swap
Post by: pacu44 on June 15, 2009, 07:59:41 pm
what you gonna do with the 400/203? dibs
Title: Re: th400/203 to sm465/205 swap
Post by: cracker0169 on June 15, 2009, 09:59:55 pm
Those trucks didnt come factory with a 203 trans so that has been swapped in...

The swap is well worth it in my book.  I swapped the 350/203 out of mine for a 465/205 setup. I checked the classifieds in the area and found a guy parting a truck out.  Picked EVERYTHING up for $650 (pedals, linkage, front shaft {he had a short bed truck}, bellhousing, clutch and flywheel).  If lower gearing off road is what you are after, you could get the doubler from ORD and have 1:1, 2:1, and 4:1 ratios. For the rear driveshaft, I had a local welding shop cut and weld up a different shaft for the correct length.
Title: Re: th400/203 to sm465/205 swap
Post by: Captkaos on June 16, 2009, 08:03:29 am
Quote from: cracker0169 on June 15, 2009, 09:59:55 pm
Those trucks didnt come factory with a 203 trans so that has been swapped in...

You are talking the 81-87 specifically, right, because the 73-80's did come with NP203's
Title: Re: th400/203 to sm465/205 swap
Post by: malibu795 on September 22, 2009, 09:48:02 am
Quote from: Captkaos on June 16, 2009, 08:03:29 am
Quote from: cracker0169 on June 15, 2009, 09:59:55 pm
Those trucks didnt come factory with a 203 trans so that has been swapped in...

You are talking the 81-87 specifically, right, because the 73-80's did come with NP203's
yep i have seen 400/203 and 465/203 OEM setup

i just put swap a 350/203 to a 400/203
Title: Re: th400/203 to sm465/205 swap
Post by: joesgarage71 on September 24, 2009, 06:35:06 pm
 Hey Chris what was the last year for the NP-205 and what app?
 Steve
Title: Re: th400/203 to sm465/205 swap
Post by: malibu795 on September 24, 2009, 07:43:26 pm
the 90s blazers when 208 right?

when did they start droping then t-case onthe driver side 87-88 on the pickups and burbans.. and 93? on the blazers?
Title: Re: th400/203 to sm465/205 swap
Post by: hotrod24 on September 24, 2009, 08:26:15 pm
 i second that because i will be looking for a th400 and np-205 setup but i think it was 1980 when the 205 come out msg103892 date=1253835306]
 Hey Chris what was the last year for the NP-205 and what app?
 Steve
[/quote]
Title: Re: th400/203 to sm465/205 swap
Post by: Captkaos on September 28, 2009, 03:40:27 pm
Quote from: joesgarage71 on September 24, 2009, 06:35:06 pm
Hey Chris what was the last year for the NP-205 and what app?
 Steve

1991 R/V 3/4-1Tons with the smaller 6 bolt pattern.  1/2T were getting the new NP241 but could still get it.  Its one of those "phased" years.