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little confuzed about doublers

original balzer

original balzer

1/2 ton status
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I searched but I cant find the answers Im looking for.

I would like to have a SM465/NP203/NP205 set up.

Heres what I have concluded SM465 has 10 spline output BUT NP 203 ONLY has 23,27,31, & 32 spline inputs. Am I missing something here? Isnt there a way to put a NP203 behind a SM465? I guess I never realy looked into it and just thought it was available.

Balzer
 
According to ORD in 73-75 Gm used 203's behind 465's with female 10 spline inputs to connect to the 465's 10 spline male output. I have never seen one of these so I can't prove it. I used a 32 spline 1978 TH400 203 with the ORD 32 spline short 465 output and the northwest fab all steel adapter to connect them. Hasn't broken yetbut I have less than 1,000 miles on mine so far.

Nate
 
when did you get the 32 spline shaft from ORD? I am gonna try to run this same setup...but called ORD a few months ago, and they said they don't have them? they said they were working on getting someone to make them. have they got them now, or is yours older?
 
http://www.offroaddesign.com/catalog/doubler.htm

[FONT=Arial, Helvetica, sans-serif]GM SM465 4 speed Manual Transmission:
If you have an SM465 transmission there are 3 ways to mate it to the NP203.[/FONT]

[FONT=Arial, Helvetica, sans-serif]1: Use a factory configuration. GM mated the NP203 to the SM465 in 1973-1975 using the 10 spline output in the 465, a 10 spline female input in the NP203 and a 4.25" adapter housing between the two. This configuration was used in a wide range of GM trucks but is somewhat rare. Problems are the 10 spline connection tends to wear in the long term and it's difficult to find. Positives would be the short length and the ability to use the common 10 spline output in the transmission.[/FONT]

[FONT=Arial, Helvetica, sans-serif]2: Use a SM465 that was originally mated to an NP208 transfer case. This 465 will have a 32 spline output shaft with a 8 3/8" adapter housing. You'll use a NP203 gearbox with a 32 spline input gear and the face of the 203 drilled and tapped with the GM round bolt pattern to match up to the factory 208 adapter housing. This works very well if you have the available length in the vehicle since the parts are commonly available and the 32 spline connection is very strong and durable.[/FONT]

[FONT=Arial, Helvetica, sans-serif]3. Use the factory SM465 to NP203 adapter housing with ORD's new 32 spline SM465 output shaft and a 32 spline input gear in the NP203. This allows the shortest overall length with the highest strength, most durable spline connection.[/FONT]
 
ftwk5 said:
when did you get the 32 spline shaft from ORD? I am gonna try to run this same setup...but called ORD a few months ago, and they said they don't have them? they said they were working on getting someone to make them. have they got them now, or is yours older?
Click to expand...
I got mine like 6 months ago and then it took then like 6 weeks to get the shaft to me after I ordered it. Do you have a factory adapter or were you going to run the northwest fab one?
 
I went to the site and it wasn't there anymore. It used to be on the page with the Th400 adapter so I pulled out my paperwork at it has been a year since I ordered mine so I guess they may have discontinued them. You could give them a call and see if they just took them off of the page for some reason.
 
This is the setup I had in my old rig...
doubler4.jpg

17.jpg


10 spline 465--->factory 465/203 adapter--->10 spline 203--->discontinued ORD adapter plate---> factory 465/205 adapter w/10 spline coupler--->10 spline 205. It worked just fine with 42's and 5.13 gears. Haaard to find the parts though. :(

My rig is in this video if ya wanna see how it worked. Just look for the ugliest rig- thats mine. :haha:

http://video.google.com/videoplay?docid=-6460089531892180223
 
I have my stock 32sp connected to an ord dubbler from a th400.
I hardly ever use both t case lows since granny gear works fine. I have better drive shaft lenths and angles now though.
 
There is the rare 10spl 203 out there. To run a 10 spl 465 doubler you must find the 10 spl 203 and the rare 465/203 adapter. They are out there but they can be somewhat hard to find and somewhat expensive when you do find them.

From what I have read they were only available in 1974 models with some of them floating into late 73 & early 75 possibly. 74 was the only full year of production on the 465/203 as far as I am aware.

Harley
 
I'm still searching for a 10 spline input 203. Been a couple years now.
 
That is why the ORD 32sp 465 output and NWF adapter was awesome. Short, strong and easy to find. Maybe a little expensive but you get what you pay for. But if NWF discontinued the adapter it's gonna get a lot harder to build that setup.

Next question from me, what are you guys with doublers running for front driveshafts? I've still got a lengthened stocker with a clearanced CV but I think that at full droop it is gonna be maxed out and if I'm in 4 wheel drive I have a feeling that it may grenade. :doah: Haven't tested this but it scares me.:confused: I've got 6 inches of lift and a 2 inch up rotation for future reference.
 
That driveshaft setup is what a few of us in AZ are running with ok results. Matt (az-k5) runs a Th350 doubler with the clearenced CV & lengthened. It has held quite well for him sofar. He has broke one but the parts he started with weren't in the best shape. His new one he just built seems to be working very well sofar. I just clocked my NP208 and about to do the same thing for my driveshafts.

My front flex is limited by my shocks so I am just going to continue with somewhat limited flex upfront like I have for the past years. I have never really found a situation where I have been at a noticeable disadvantage from lack of front flex.

Matt (az-k5) & Andrew (77chevyK10) are currently working on a driveshaft setup like they showed on Pirate awhile back that used axleshaft ujoints & ears to increase the flex angle and minimze costs. They just started working on it so I don't think they have progressed far on it. Andrew is the one who will probably be machining the stuff to make it work.

You might also think about moving the front axle forward some if you can so you can lengthen the dshaft & decrease the operating angle a little. That is my plan. My front axle is going 1.5" forward soon to help my 37's clear the firewall more & to help with the driveshaft angle.

Harley
 
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