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Old 08-10-2011, 10:43 AM   #1 (permalink)
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What Np205 for sm465?

I just bought sm465 without a t-case. It has the round 6 bolt pattern and 32spl output.
Do I need the long input shaft 205?
They easy to find?
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Old 08-10-2011, 11:20 AM   #2 (permalink)
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You have two options:

Find a 205 with the six bolt round pattern, it will have a long 32 spline input gear. That one will bolt right up to your adapter but they are tough to find, they only came in 85-91 1 tons.

Find a 205 with the figure 8 pattern, ideally with a short 32 spline input gear (that would have come from behind an 84 and older TH400, we can help you convert another 205 over to that input if you can't find one). Then you can use an older factory 465/205 adapter (the figure 8 one) with this spacer and it all bolts up:

http://offroaddesign.com/catalog/465spacer.htm

*Edit* I guess I should have asked, do you want a driver's or passenger drop 205?
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Old 08-10-2011, 11:42 AM   #3 (permalink)
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Passenger side drop.
Could I just use get the figure 8 pattern adapter and use a short shaft 32spl 205?
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454 4spd 241/205 doubler
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56s front 63s out back
Full hydro
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UNDER CONSTRUCTION 94 Z71
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Old 08-10-2011, 03:15 PM   #4 (permalink)
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Quote:
Originally Posted by STACKED View Post
Passenger side drop.
Could I just use get the figure 8 pattern adapter and use a short shaft 32spl 205?
nope.
it wont fit.
you need a round faced 205 and the long input.
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Old 08-10-2011, 03:23 PM   #5 (permalink)
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Quote:
Originally Posted by STACKED View Post
Passenger side drop.
Could I just use get the figure 8 pattern adapter and use a short shaft 32spl 205?
Yes you can, with the spacer I linked to before.
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Old 08-10-2011, 07:09 PM   #6 (permalink)
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I got a long input 205 off an 86 1 ton that I parted, tired of tripping over it. Bitch would be shipping it....
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Old 08-10-2011, 07:16 PM   #7 (permalink)
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So with the ord adapter I could use an older figure 8 style with the short 32spl input?
It seems to me that it would make it need a even longer input shaft
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Old 08-10-2011, 07:56 PM   #8 (permalink)
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make sure you have a 205 adapter and not the 208 adapter
they are different lengths
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Old 08-10-2011, 08:32 PM   #9 (permalink)
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Hell I thought they were the same.
What's the difference?
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Rocks both welded
56s front 63s out back
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UNDER CONSTRUCTION 94 Z71
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Old 08-11-2011, 04:34 AM   #10 (permalink)
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The round pattern 205 and 208 are the same length, just the 205 has a notch for the shift rails.
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Old 08-11-2011, 06:52 AM   #11 (permalink)
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Quote:
Originally Posted by b454rat View Post
The round pattern 205 and 208 are the same length, just the 205 has a notch for the shift rails.

Correction: the round pattern 465/205 adapter is 10" long, whereas the round pattern 465/208,241 adapter is 8" long.
As stated, the 465/205 adapter is notched for the 205 shifter rail, and has a boss cast into the side for the 205 shifter to bolt to.
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Old 08-11-2011, 07:21 AM   #12 (permalink)
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Mine is for a 205 then.
Thanks, that would have sucked.
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Rocks both welded
56s front 63s out back
Full hydro
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UNDER CONSTRUCTION 94 Z71
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Old 08-11-2011, 07:28 AM   #13 (permalink)
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So with the ord adapter I could use an older figure 8 style with the short 32spl input?
It seems to me that it would make it need a even longer input shaft?
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Rocks both welded
56s front 63s out back
Full hydro
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UNDER CONSTRUCTION 94 Z71
2 1/2 rockwells disk brakes
49" michelins
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Old 08-11-2011, 09:04 AM   #14 (permalink)
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Quote:
Originally Posted by STACKED View Post
So with the ord adapter I could use an older figure 8 style with the short 32spl input?
It seems to me that it would make it need a even longer input shaft?
As mentioned above the 465/205 adapter you have is super long and meant to use a long input in the 205 (this kept driveshaft lengths the same between late 465/205 and 400/205 setups).

The fig 8 465/205 adapter is more like 7", the spacer we make is do to exactly what you're trying to do: mate a factory 32 spline 465 to a fig 8 205 using a short 32 spline input.
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Old 08-11-2011, 02:46 PM   #15 (permalink)
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If you already have the 465/round 205 adapter, post up a wanted ad for a round 205. No need to add another adapter in place, or trade tranny outputs.
If you can't find one local, let me know-I'm sure I can find one and get it ti you reasonably.
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Old 08-11-2011, 03:58 PM   #16 (permalink)
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I don't have a figure 8 adapter yet, mine is the 6 bolt just weighing my options.
I really appreciate all of your help.
Which adapter is stronger the 6 bolt or figure 8? I also plan on doing dual 465s In the future and I need the strongest adapter.
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454 4spd 241/205 doubler
Rocks both welded
56s front 63s out back
Full hydro
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UNDER CONSTRUCTION 94 Z71
2 1/2 rockwells disk brakes
49" michelins
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Old 08-11-2011, 07:32 PM   #17 (permalink)
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I firmly believe the reason GM dropped the tall adapter in favor of the short style was to alleviate the leverage factor which was the cause of so many adapter breaks. I have seen dozens of tall adapters cracked or broken at the mounting points, and have yet to see a single short adapter broken, accident damage not withstanding.
If you get the chance to compare a tall and a short side by side, you will see what I mean; with the mounting point closer to the centerline of torque transmission, the leverage factor is dramatically reduced.
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Old 08-12-2011, 07:22 PM   #18 (permalink)
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I have a round 208 adapter also. Which way should I go. Will a 208 hold up. 454 4spd crew cab build prolly 39-47" tires
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454 4spd 241/205 doubler
Rocks both welded
56s front 63s out back
Full hydro
15" bead locks
46" MT CLAWS

UNDER CONSTRUCTION 94 Z71
2 1/2 rockwells disk brakes
49" michelins
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divorced ford np205
custom SAS
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Old 08-12-2011, 07:55 PM   #19 (permalink)
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Quote:
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I have a round 208 adapter also. Which way should I go. Will a 208 hold up. 454 4spd crew cab build prolly 39-47" tires
Not even close, the 208 will become many jagged pieces.

You need to keep the 32 spline output on the SM465, that leaves 3 options:

1: factory 465 to NP205 round pattern adapter (10"-ish) with round 205 and long input

2: 465 to 208 adapter (8"-ish) with round 205 and short input but you'll have to notch the adapter and deal with shifting.

3: 465 to 205 fig 8 adapter (7"-ish) with our plate and a fig 8 205 with short 32 spline input.

I'd personally tend toward #3 and not just because we sell the parts. The adapter is replaceable where #1 is really hard to find if anything happens to it. The aftermarket adapter housing we carry is pretty tough and I doubt you'd have problems with it anyway. The 32 spline fig8 205 is easier to find or create to get you started or to replace for any reason.

Actually I'd lean toward #4, put a reduction box in front of the 205, but depending on your gears, tires and terrain, you may not need it. I like it.
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Old 08-13-2011, 12:07 AM   #20 (permalink)
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Actually I'd lean toward #4, put a reduction box in front of the 205, but depending on your gears, tires and terrain, you may not need it. I like it.
You still haven't told us if you like it more than the automatic tho...
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