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06-30-2008, 05:20 PM
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#1 |
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Registered User
Join Date: May 2008
Location: cali
Posts: 43
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sm465 t-case coupler
hey guys i have a 68 burban 4x4.. does anyone know where i can pick up a coupler (sleeve) that goes between a sm465 and a rockwell t221.. my burban has alot of slack in the driveline and i think its the coupler... im going to pull it out soon and make sure it is but i want to shop around but i cant find one anywhere.. does autozone carry them?
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06-30-2008, 05:58 PM
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#2 |
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Post Whore
 
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,686
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Re: sm465 t-case coupler
Welcome to the board.
That may well be a hard part to come by. I'll look around my barn and see if by chance I have one out of a spare to get a measurement for you. Memory tells me it is 10 splined but I can't remember how similar sized it is to the NP205's coupler. When I swapped my 3 speed for a 4 speed, the 4 speed's adapter was missing it's adapter. I'm pretty sure I took the 3 speed's coupler and had it cut down to the right length. Here's a pic of my coupler cut down next to a very rusty spare. I still have the rusty spare that I can get measurements for sure.
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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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06-30-2008, 11:04 PM
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#3 |
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Registered User
Join Date: May 2008
Location: cali
Posts: 43
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Re: sm465 t-case coupler
i did some research.. i know its a 10 spline but not sure the measurments.. i wont know for sure if thats the problem till i get i out but i will gladly modify a diffrent one to make it fit... ill be doing a build up thread soon too...
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06-30-2008, 11:13 PM
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#4 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,686
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Re: sm465 t-case coupler
Okay, I compared a Rockwell T221 coupler to an NP205 coupler and they are the same outer and inner diameter *edit - they are not the same! see my later reply*. The Rockwell coupler is 3 3/8" long with the splines cut back 1/4" from both ends. The NP205 coupler is 4 1/4" long and the splines are not cut back but they are angled. If that doesn't make sense, let me know and I'll get pics.
So you can get an NP205 coupler and have it cut down.
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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; 07-01-2008 at 03:52 PM. |
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06-30-2008, 11:29 PM
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#5 |
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Registered User
Join Date: May 2008
Location: cali
Posts: 43
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Re: sm465 t-case coupler
ok so if i get a coupler from a np205 i can cut it down to 3-3/8.. maybe have to trim the splines?
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07-01-2008, 12:10 AM
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#6 |
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Registered User
Join Date: Nov 2006
Location: OAKLAND CALI
Posts: 61
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Re: sm465 t-case coupler
Hey thats the same part that I need. Is there any place that I order from. My has a bunch of slack too
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07-01-2008, 03:51 PM
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#7 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,686
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Re: sm465 t-case coupler
I brought the two couplers to work today and I was wrong when I said they were the same diameter inside and out. Both couplers slip onto the 465's output shaft so the inside diameter is the same, however the outside diameters are different!
The outside diameter of the Rockwell's coupler is 2" while the outside diameter of the NP205 couple is 1 7/8". I also noted that the coupler for the Rockwell has splines that are open all the way through the coupler, however the NP205's coupler have what look like snap rings about 1 5/16" inside the coupler splines I'm guessing to keep the coupler from sliding to far onto the shaft of the transfer case or transmission. So, unless you can find a seal that would make up for the 1/8" difference in diameter, the NP205 coupler won't be useable after being cut down. If you want, I will measure the Rockwell's adapter seals and see if by chance they are the same outer diamter as the NP205's seals. If so, I would guess you could use the NP205's seals in your adapter and then be able to use the NP205's cut down coupler. Sorry for the mis-information in the previous post! Here are three pics for reference   
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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; 07-01-2008 at 04:19 PM. |
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07-01-2008, 04:09 PM
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#8 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
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Re: sm465 t-case coupler
While on the subject of these causing a lot of slack - being worn can definitely put a bit of slack into the driveline but there are probably other things that are adding up to both of you having a lot of slack in the driveline.
Both of my trucks have a bit of slack in the driveline that is noticeable like when I stop on a bit of an incline and shut the truck off in gear - the truck will roll forward or backwards a bit, however, I have had both transfer cases out not long ago and know for a fact that my both of the couplers are in very good condition. So, don't be surprised if the couplers end up not being the only source of the slack.
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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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07-01-2008, 05:18 PM
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#9 |
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Registered User
Join Date: May 2008
Location: cali
Posts: 43
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Re: sm465 t-case coupler
first off, thank you that info is very helpful.. as far as slack i have something that is very worn.. evry time i shift it bangs loud.. feels lift a bad u joint but they look good... im going to be pulling the driveshaft and check them first then pull the t-case.. i hope it is just a ujoint
plus do you know a good place to buy the part if it is bad? Last edited by lowe137; 07-01-2008 at 05:48 PM. |
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07-03-2008, 05:27 PM
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#10 |
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Registered User
Join Date: May 2008
Location: cali
Posts: 43
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Re: sm465 t-case coupler
i took it all apart and my coupler is worn.. only on the tranny side, but the tranny output shaft is worn too.. for now i switched the coupler around till i can get parts... i need a coupler and main shaft for sm465.. if any one knows where to buy these parts let me know...
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07-12-2008, 12:03 AM
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#11 |
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Registered User
Join Date: Jun 2008
Location: Evergreen, CO
Posts: 9
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Re: sm465 t-case coupler
I have also had problems with the coupler between my T221 and SM465. But it has worn out twice on the T221 side. The last time it stripped the splines completely out of the T221 side of the coupler. The input shaft splines on the T221 have also worn. Since I have not been able to find the couplers or a replacement input shaft for the T221 I am in the process of replacing it with an NP205. Please see the thread I posted today 7/11 for some of the issues I have run into. By the way my truck is a 1968 3/4T. If anyone can help me with the driveshaft issues I would appreciate it.
Thanks, Don
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1968 GMC K2500 |
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08-02-2008, 01:23 AM
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#12 |
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Registered User
Join Date: Jun 2007
Location: oregon
Posts: 1,069
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Re: sm465 t-case coupler
can someone tell me what that slot across the face of the couplers is for?
__________________
69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears: 
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08-02-2008, 11:28 AM
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#13 |
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Account Suspended
Join Date: Feb 2004
Posts: 3,051
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Re: sm465 t-case coupler
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08-02-2008, 01:40 PM
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#14 | |
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Registered User
Join Date: Feb 2003
Location: The Rubber City
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Re: sm465 t-case coupler
Quote:
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1969 GMC K2500  1996 Honda Accord 2007 Kawasaki KLR 650 |
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08-02-2008, 01:52 PM
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#15 | |
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Registered User
Join Date: Jun 2007
Location: oregon
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Re: sm465 t-case coupler
Quote:
still wondering what that slot is for.
__________________
69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:
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08-02-2008, 02:14 PM
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#16 |
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Registered User
Join Date: May 2008
Location: cali
Posts: 43
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Re: sm465 t-case coupler
well guys i ended up swapping out my 221 for a 205... i got a whole donor truck for 500 bucks and couldnt pass it up... now i have new a new set of problems im working out.. so far this site has been sooooo helpful...
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08-02-2008, 03:05 PM
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#17 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,686
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Re: sm465 t-case coupler
What problems are you running into?
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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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08-02-2008, 03:43 PM
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#18 | |
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Registered User
Join Date: Jun 2007
Location: oregon
Posts: 1,069
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Re: sm465 t-case coupler
Quote:
__________________
69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:
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08-02-2008, 05:17 PM
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#19 |
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Registered User
Join Date: May 2008
Location: cali
Posts: 43
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Re: sm465 t-case coupler
main problems now are getting a rear shaft.. when i drove it with just a front drive shaft... it pops out of 4-high into 2-high when i decelerate in gear.. not sure if its cause i dont have a rear shaft...
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08-04-2008, 11:47 AM
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#20 |
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Registered User
Join Date: Jun 2008
Location: Evergreen, CO
Posts: 9
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Re: sm465 t-case coupler
I just finished replacing my T221 with an NP205. I ended up having new front and rear driveshafts made. Tom Woods 4xshaft.com built the rear driveshaft for me ($304.00). The stock with the T221 was a 2 piece. The new shaft is one piece, 3 1/2" diameter. I had to remove ( cut the rivets) holding the old center support bracket and notch the frame crossmember that the bracket was riveted to. I reinforced this crossmember with a c-channel. The new driveshafts are great and I have had no problems.
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1968 GMC K2500 |
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08-04-2008, 11:50 AM
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#21 | |
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Registered User
Join Date: Jun 2007
Location: oregon
Posts: 1,069
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Re: sm465 t-case coupler
Quote:
__________________
69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:
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08-04-2008, 12:07 PM
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#22 | |
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Account Suspended
Join Date: Feb 2004
Posts: 3,051
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Re: sm465 t-case coupler
Quote:
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08-04-2008, 03:37 PM
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#23 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,686
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Re: sm465 t-case coupler
As far as I know the NP205 adapter is a dry adapter (doesn't hold any gear oil).
I know the Rockwell T221 adapter doesn't hold any gear oil as there is a hole in the foot of the adapter where it bolts to the crossmember.
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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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08-04-2008, 04:33 PM
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#24 | |
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Registered User
Join Date: Jun 2007
Location: oregon
Posts: 1,069
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Re: sm465 t-case coupler
Quote:
I agree.....................I greased mine up real good just for that reason.........................that slot has always baffled me. I can't figure any logical purpose for it.
__________________
69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:
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08-04-2008, 04:49 PM
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#25 |
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Account Suspended
Join Date: Feb 2004
Posts: 3,051
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Re: sm465 t-case coupler
Hey, you guys asked for my guess, I threw it out there. I know it's a dry system, I also know those seals leak like a sieve...
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