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03-22-2005, 10:20 PM
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#1 |
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Registered User
Join Date: Jan 2005
Posts: 21
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SM 420 Question
How hard is a SM 420 to NP205 adapter to find?? I own an 84' and recently swapped out the raggy R4 for a TH350 and am pleased but i still like a manual. I have a 420 with a rockwell T221 T case attached, but dont know much about the T221. I also have a 465 that is missing an input shaft and top cover i could rebuild. I hear the 420 is pretty tuff though. Any suggestions anybody??
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03-23-2005, 07:27 AM
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#2 |
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user # 2756
 
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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very thay were never offered together, in 69 the rockwell was mated to an SM465, then it was sm465 to NP205. The two never crossed. Probably have to call one of the aftermarket adapter people like advanced adapters. Well the 420 was out of production in 1968 time frame, so it's old but still strong. The rockwell would just cost more to rebuild but parts are available if needed. Go w/ the 420/221 or find a 465/205 combo.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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03-23-2005, 08:34 PM
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#3 |
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Registered User
Join Date: Jan 2005
Posts: 21
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Yea, ive heard its pretty tuff, I just dont know much about the rockwell and theres not near as much info on it as there is on the 205.
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03-24-2005, 01:52 PM
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#4 |
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Senior Member
Join Date: Jul 2004
Location: Clarks Hill, Indiana
Posts: 733
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Rockwell
I rebuilt my Rockwell last fall. It is very easy to do. The hardest part was getting together all of the seals. I had to go to 3 or 4 different places to get all the seals together. I pulled it apart, found out what I needed, spent saturday morning chasing parts, and put it back together. Drove her to work Monday morning
 As long as you've got the adaptor, put the 420 & 221 in and drive it like you stole it!!
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1969 K10 - V8, 465, 205, 12 bolt, D44 2002-current 1969 K20 - V8, 465, 221, Eaton, D44 2012-current Nothin' but drums on all 4 corners! past horses in the stable 72 C10-short step (97-02), 68 C10-long fleet (06-12) |
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