« previous next »
Pages: [1]   Go Down

Author Topic: th400/203 to sm465/205 swap  (Read 6738 times)

Offline whiskeybent

  • New Users
  • Posts: 2
th400/203 to sm465/205 swap
« 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.
Logged
"Doing it in the dirt"
84 K-20 350(for now), th400, np 203

Offline pacu44

  • Newbie
  • Posts: 8
Re: th400/203 to sm465/205 swap
« Reply #1 on: June 15, 2009, 07:59:41 PM »
what you gonna do with the 400/203? dibs
Logged

Offline cracker0169

  • Registered Users
  • *
  • Posts: 150
    • Myspace
Re: th400/203 to sm465/205 swap
« Reply #2 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.
Logged
1981 K10, 350 - SM465 - NP205 sittin' on 37's
1983 C10, 305HO - TH400

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18377
    • http://www.73-87chevytrucks.com
Re: th400/203 to sm465/205 swap
« Reply #3 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
Logged

Offline malibu795

  • Frequent Member
  • **
  • Posts: 336
Re: th400/203 to sm465/205 swap
« Reply #4 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
Logged
adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline joesgarage71

  • Wrench
  • Senior Member
  • ****
  • Posts: 1157
Re: th400/203 to sm465/205 swap
« Reply #5 on: September 24, 2009, 06:35:06 PM »
 Hey Chris what was the last year for the NP-205 and what app?
 Steve
Logged
78' K-20 355/SM465/twin stick 205 6" on 36's
14 bolt FF/big bearing Dana 44 4.56 gears
92' GMC C-1500 454/4L80E/14 bolt

Offline malibu795

  • Frequent Member
  • **
  • Posts: 336
Re: th400/203 to sm465/205 swap
« Reply #6 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?
Logged
adam wildman
75 K25 383/400
79 malibu 454/T56 305rwhp/432rwtq 15.6@92.8mph
02 2500HD D-max/allison best time 13.77 @ 99mph 463rwhp/930rwtq

Offline hotrod24

  • Senior Member
  • ****
  • Posts: 1696
Re: th400/203 to sm465/205 swap
« Reply #7 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]
« Last Edit: September 24, 2009, 08:35:07 PM by hotrod24 »
Logged
1980 1/2 ton shortbed project...
1978 pontiac grand prix...

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18377
    • http://www.73-87chevytrucks.com
Re: th400/203 to sm465/205 swap
« Reply #8 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.
Logged
Pages: [1]   Go Up
« previous next »