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#1 |
Modern day Fred Sanford
Join Date: Oct 2005
Location: Greeneville,TN
Posts: 330
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The official,unofficial guide to transfer case adapters
"What does this adapter fit or what adapter do I need to run transfer case X behind transmission Y" is a commonly asked question on this board and others that I frequent.This is a guide to help identify what parts you have or will need when swapping transmissions and cases.
Starting in around 1970ish until around 1977 the Th350/205 adapters used a center support bearing around the drive sleeve to hold it in place. ![]() The sleeve had a step cut in it to accommodate the bearing,whereas the later style didn't. Early style on the left,later on the right. ![]() The 78ish to 80 Th350/Np205 adapters are identical to the earlier style with the exception of the sleeve and bearing.All Th350/205 will have a four bolt pattern on the trans side. ![]() And racetrack or figure eight pattern on the case side. ![]() During that time GM also offer the 203 fulltime case behind the TH350's and they took a different adapter. Trans side. ![]() Case side. ![]() The Th400 adapters came in four different styles depending on the application. The 400/205 adapters were either the figure eight/racetrack pattern up until about 1984,or the later round pattern used until around 91 when the body style changed on the 1-tons. Figure 8/race tack pattern (trans side). ![]() Case side. ![]() The late style round pattern adapter. Trans side. ![]() Case side. ![]() Last edited by 1-tonmudder; 01-15-2009 at 11:22 PM. |
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#2 |
Modern day Fred Sanford
Join Date: Oct 2005
Location: Greeneville,TN
Posts: 330
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Re: The official,unofficial guide to transfer case adapters
The 81ish-87 3/4 ton's with the Th400 trans used a different adapter.It is shorter/thinner than the 400/205 adapter's and has no provisions for a shifter to be bolted on the side.
Trans side. ![]() Case side. ![]() The 400/208 combo's used the Mil CUCV pickup's were the same as the civilian versions but use a taller or longer adapter.Otherwise they are the same as the civ version. ![]() The 400/203's used one style and it was completely different from the others. Trans side. ![]() Case side. ![]() In about 1981 GM starting usin the 208's behind the Th350's.It was only a 1-2 year deal until the 700R4's came out.The 700 and 350's both different adapters. The Th350/208 adapter,trans side. ![]() By 1983 they were using the 700's and it required another adapter. Trans side. ![]() Last edited by 1-tonmudder; 01-15-2009 at 11:39 PM. |
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#3 |
Modern day Fred Sanford
Join Date: Oct 2005
Location: Greeneville,TN
Posts: 330
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Re: The official,unofficial guide to transfer case adapters
The SM465 four speeds used four different adapters.The 465/Rockwell 221 adapter was the first.(I will post at a later date).
The second was the 465/205 adapter used from about 1972ish to 1980. Trans side. ![]() Case side.(again the racetrack/figure eight pattern) ![]() Around 1973 until 1975 they offered the 203 behind the 465.This is the only pic I have at this time. ![]() The 3 speed sagianw transmissions were offered with a 205 behind them as well. Trans side. ![]() Case side. ![]() In 1981 they went to the NP208 and for the most part got away from the 205's except in the 1-tons.The 465 adapters changed again with the case change. Trans side. ![]() Case side. ![]() Around 1986 GM went to the round pattern 205's and changed the adapters also. Trans side. ![]() Case side. ![]() The late 465/205 adapter looks alot like the 465/208 adapter but the 208 adapter will work on a 205 due to it not having any provisions for a shifter(notch on the flange and threaded insert on side. ![]() Now for the disclaimer.I am not an expert nor do I claim to be.The dates are not exact,give or take a year or two, and this is not to say that newer/older parts have been swapped in.These are merely my observations from years of swappin/buyin/sellin and usin these parts. Last edited by 1-tonmudder; 01-17-2009 at 10:37 PM. |
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#4 |
Well, Whoop-dee-do!
![]() Join Date: Mar 2003
Location: Easton, Mo. pop.- me & scarcely a few others
Posts: 2,302
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Re: The official,unofficial guide to transfer case adapters
Good idea! I'd like to add that of the 465/ 205 combos, the later "round pattern" is IMO the best. It uses a female input like the TH400 setup. No coupler to wear, less "clink clank" on accel/ decel and far stronger. The old coupler type can can split or shear the splines off with big HP and abuse.
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'68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD ![]() '72 K20 500 Cad/TH400/NP205 SOLD ![]() '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car ![]() |
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#5 |
Modern day Fred Sanford
Join Date: Oct 2005
Location: Greeneville,TN
Posts: 330
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Re: The official,unofficial guide to transfer case adapters
I have pulled the old 10 spline sleeve's off and the splines on the trans output have almost a razors edge on em.The later is a lot better design,just harder to come by.
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#6 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,683
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Re: The official,unofficial guide to transfer case adapters
Do you need pics of the Rockwell T221 to SM465 adapter? I'll take some good ones for you if you do. I also have a good pic with a side by side comparison of the NP205 sleeve and the Rockwell T221's sleeve.
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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#7 |
Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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Re: The official,unofficial guide to transfer case adapters
Here are some I have. #1 is the transmission side of the 465/221 adaptor
![]() this is the transfer case side ![]() the side cover ![]() and then I had this shot saved of the 32 spline 465/205. This isn't mine, I forget where I found the pic. ![]()
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1969 GMC K2500 ![]() 1996 Honda Accord 2007 Kawasaki KLR 650 |
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#8 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,862
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Re: The official,unofficial guide to transfer case adapters
Lookin`good for a FAQ thread for sure.How about transfer case differences for each transmission?Like spline counts and differences in shaft lengths.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#9 |
Currently Blazerless
Join Date: Apr 2000
Location: St. Joseph Mo.
Posts: 4,826
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Re: The official,unofficial guide to transfer case adapters
This has been long overdue...some great info here.
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1972 C/30 133" W.B. C&C 1970 GMC 3500 157" W.B. single wheel C&C |
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#10 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,683
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Re: The official,unofficial guide to transfer case adapters
Here is a comparison of the measurements of the SM465/Rockwell T221 combo and the SM465/NP205 combo (the NP205 is a 70's vintage with a yoke style rear output.)
![]() ![]() And here are some pics of the coupler/sleeve differences. Both couplers are for mating to the SM465. ![]() ![]() ![]() The first pic makes the one coupler's diameter look alot bigger, but it is actually just a bit bigger. And a note, the 3 speed manual/Rockwell coupler is longer than the SM465/Rockwell coupler and can be cut down to be used if you were to swap from the 3 speed manual to the SM465 but still staying with the Rockwell transfer case.
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 Last edited by Yukon Jack; 01-17-2009 at 09:59 AM. |
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#11 | ||
Modern day Fred Sanford
Join Date: Oct 2005
Location: Greeneville,TN
Posts: 330
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Re: The official,unofficial guide to transfer case adapters
Quote:
![]() Thanks for the pics. Quote:
Does anybody have any pics of the TH350/Dana adapter ???? The one used before the 205's.That is the only adapter I have never had one of. |
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#12 |
Registered User
Join Date: Oct 2008
Location: WV
Posts: 209
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Re: The official,unofficial guide to transfer case adapters
Excellent information. This will be very helpful in my saginaw to sm465 conversion. Thank-you 1-tonmudder!
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#13 |
Modern day Fred Sanford
Join Date: Oct 2005
Location: Greeneville,TN
Posts: 330
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Re: The official,unofficial guide to transfer case adapters
I got my late style 465/205 adapter today so I added that info.
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#14 |
Registered User
![]() Join Date: Sep 2003
Location: Denver, CO
Posts: 3,725
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Re: The official,unofficial guide to transfer case adapters
Old thread--does anyone know where this information (with pictures) can be found today?
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