Question For SM465 Guru's

[MuddinManny]

If you have a 465/208 like your sig says, then you have a 32 spline 465.

The 10 spline he's referring to is a 465/221 and 465/205 thing only. It has the crappy little splined sleeve between the male output of the trans and male input of the xfer that likes to strip out.

The 465/208 and 465/241 definitely all have 32 spline connections with no sleeve. So do newer (84 or 85 and up K30) 465/205's, but they are rare because they only came under K30's.

So is there such a thing as a 32 spline NP205? If so, what year(s) truck(s) do I search for in the bone yard?

Manny

 

[RingMaster4x4]

So is there such a thing as a 32 spline NP205? If so, what year(s) truck(s) do I search for in the bone yard?

Manny

you just missed it manny. So do newer (84 or 85 and up K30) 465/205's

 

[Jimbo*]

OK, did some checking, comparing and testing. The aluminum cover shifter setup is definately shorter throw. The shifter will not interfere with either the dash or a bench seat set all the way back( don't know for you short guys). The shifter is moved rearward 3 5/8 inches from a standard cast iron type shifter cover.
The first two pics show the difference in shifters; short throw aluminum top shifter above the cast iron top shifter.
Third and fourth pics show the difference between the aluminum top cover, and the cast iron top cover.
Manny, the fourth pic is the same as your tranny.
The last pic shows the noticeable overhang the aluminum top has.
Clear as mud, right?
Jimbo

 

[Jimbo*]

Sorry Manny, I should have read your sig, then I would have known you have a 32 spline 465.
You can bolt up a round 32 spline 205 to your tranny with the correct adapter. This adapter is far more scarce than the round 205.
Jimbo

 

[BigBen]

This is starting to look like a pretty cool 'possible' upgrade on my '74.
I wonder how much floor I'll need to chop out to get it to fit?

-Ben

 

[dyeager535]

I was wondering that as well, only one issue I see (without having a floor pan to look at right now) is that the tower may stick up so far that the boot won't work any more. As I recall, the floor slopes down right about where the newer style tower sits.

 

[u2slow]

True enough, but that style is also meant to have a straight shifter rather than the double bend style the square body versions got. My NV4500 shifter (same 5" rearward location) with the straight shifter doesn't drop any further rearward when in reverse than the old 465 I had did. Of course the NV4500 does have a shorter crisper throw...no knuckles into the dash in third either.

My '69 C20 had a straight (single bend) shifter on the 465.

The 465 shifter in my Burb wasn't a knuckle smasher until I bent it from abuse.

AFAIK, those late aluminum cover is quite sought-after because they are more easily broken than the old iron ones.

 

[MuddinManny]

Ok, let's go through this slower.
1) It's more than just shifters, it's the entire top cover of the tranny. I have an extra. We are not sure the throw is actually shorter, yet.
2)Round=hump(s)=short=32 spline.
Figure eight or "racetrack" =flat crossmember=tall adapter=10 spline

Jimbo

I checked today. I have a long flat crossmember, standing pretty tall, and the Figure 8 Pattern where the TC meets the Tranny. That means my output is a 10 spline?

Sorry for my stupidity

Manny

 

[Jimbo*]

Manny, you are not stupid!
Your sig says you have an NP 208 transfer case. If you in fact do, then you have a 32 spline SM465, and you can bolt a NP 205 to it.
When you feel like it, look at your transfer case. Is it aluminum or cast iron?
If it is aluminum, there should be a circular tag with leters and numbers stamped into it. These letters and number will tell you the model and gear ratio of your transfer case.
If it is cast iron, you have two possibilities; NP205, or NP203.
You might have an NP205, but I seriously doubt you have An NP203.
If your case is cast iron, and has a small round cover with three bolts holding it on in the center of the rear of the case, then you have a NP205.
Let me know what you find.
Jimbo

 

[MuddinManny]

Manny, you are not stupid!
Your sig says you have an NP 208 transfer case. If you in fact do, then you have a 32 spline SM465, and you can bolt a NP 205 to it.
When you feel like it, look at your transfer case. Is it aluminum or cast iron?
If it is aluminum, there should be a circular tag with leters and numbers stamped into it. These letters and number will tell you the model and gear ratio of your transfer case.
If it is cast iron, you have two possibilities; NP205, or NP203.
You might have an NP205, but I seriously doubt you have An NP203.
If your case is cast iron, and has a small round cover with three bolts holding it on in the center of the rear of the case, then you have a NP205.
Let me know what you find.
Jimbo

That easy Jimbo: 208C. The case is aluminum. Tranny is cast iron. So I can get a 205 and it's direct swap? I'm sorry, I just am havin' a tough time with this. I don't know why?

Manny

 

[Jimbo*]

That easy Jimbo: 208C. The case is aluminum. Tranny is cast iron. So I can get a 205 and it's direct swap? I'm sorry, I just am havin' a tough time with this. I don't know why?

Yes, it is a direct swap. What you need is:
1) a round 205 with the long 32 spline input
2) the 465-round 205 adapter
3) a single hump crossmember, and
4) the correct tranmission mount

I'm pretty sure your front driveshaft will work, it's the rear that will need attention. Look on the bright side, this is a perfect opportunity to eliminate the slip yoke!
If you do any crawling, you might want to consider a twin stick setup; this is an upgrade to a 205.
You should also consider, even though the 205 is worlds stronger that your 208, the low range is 1.96 to 1, whereas your 208 low range is 2.62 to 1.
This probably won't matter with a 4 speed, just letting you know.
Any other questions, don't hesitate.
Glad you're feeling better!
Jimbo

 

[MuddinManny]

That easy Jimbo: 208C. The case is aluminum. Tranny is cast iron. So I can get a 205 and it's direct swap? I'm sorry, I just am havin' a tough time with this. I don't know why?

Yes, it is a direct swap. What you need is:
1) a round 205 with the long 32 spline input
2) the 465-round 205 adapter
3) a single hump crossmember, and
4) the correct tranmission mount

I'm pretty sure your front driveshaft will work, it's the rear that will need attention. Look on the bright side, this is a perfect opportunity to eliminate the slip yoke!
If you do any crawling, you might want to consider a twin stick setup; this is an upgrade to a 205.
You should also consider, even though the 205 is worlds stronger that your 208, the low range is 1.96 to 1, whereas your 208 low range is 2.62 to 1.
This probably won't matter with a 4 speed, just letting you know.
Any other questions, don't hesitate.
Glad you're feeling better!
Jimbo

Thanks for your help. I'd be lost without your knowledge! Thanks for your thoughts towards my healing. It's a long road but I'm makin' it.

I will search for posts/pics of this adapter and the match tc. If I can't find any, can you possibly help out?

Manny

 

[Jimbo*]

Thanks for your help. I'd be lost without your knowledge! Thanks for your thoughts towards my healing. It's a long road but I'm makin' it.

I will search for posts/pics of this adapter and the match tc. If I can't find any, can you possibly help out?

I don't have the adapter, but do have/know the location of everything else.
Jimbo

 

[MuddinManny]

Hey Jimbo,

I got the low down on a SM465w/205 for $400.00. Question is, can I just disconnect that 205 from that tranny and hook it to mine?

Manny

 

[tRustyK5]

The vast majority of 465/205 combo's out there are 10 spline versions. You need a TH400 version 205, and possibly a new input gear. I think the TH400 uses the short 32 spline input and the 32 spline 465 uses the long 32 spline input.

Rene

 

[skyyk5]

I have the aluminum top in my K5. I love it! You can just swap the tops if you want. I used the clutch kit for a 89 blazer. If you can get a aluminum top, they are junk, just give it to me.

 

[Jimbo*]

The vast majority of 465/205 combo's out there are 10 spline versions. You need a TH400 version 205, and possibly a new input gear. I think the TH400 uses the short 32 spline input and the 32 spline 465 uses the long 32 spline input.

Rene

Rene, you are correct that most 465/205 combo's are 10 spline. However, in 1985 when GM went to the round style 205, they standardized the system, and just made one 205--round bolt pattern, and long 32 spline input. These 205's were installed behind 465's, TH400's, and even the few 4L80E's built in 1991.

The key here Manny, is to be absolutely sure the 205 you have found is the round style bolt pattern, AND has the corresponding adapter.
Jimbo

 

[Jimbo*]

I have the aluminum top in my K5. I love it! You can just swap the tops if you want. I used the clutch kit for a 89 blazer. If you can get a aluminum top, they are junk, just give it to me.

Finally!! A testimonial that corroborates my theory! Thanks Bro!!

How much clearance is there behind the shifter and the dash in low and/or third? How does the shifter clear the seat/console in reverse?

Thanks, Jimbo

 

[skyyk5]

Finally!! A testimonial that corroborates my theory! Thanks Bro!!

How much clearance is there behind the shifter and the dash in low and/or third? How does the shifter clear the seat/console in reverse?

Thanks, Jimbo

Well I can't really tell you that. I didn't even notice the difference in the position of the shifter hole till I had it cut, and was trying to put the tranny in. I already took the Alum. top shifter and bent it to match a cast top. I love it that way though. I would do it again.

 

[skyyk5]

If you copy a cast shifter bend, it will be farway from the dash, but alittle close to the console, I would bend it alittle foward. I love were it sitts though, feels good going through the gears. Would like to try a straight (stock) stick, to see what would happen. I think it would hit the console. I could get pics tomorrow if you want. The only thing is how close it is to the t-case shifter, the two holes pritty much meet. I'm running a 241, for now.