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Sm465 help!!

 
ChevyMan84.
I love my Chevy Chevette!
Posts: 7
Joined: 08/13
Posted: 08/14/13 09:20 PM

I just bought an sm465 out of a 78 k30 4x4. It's a 10 spline input and 10 spline output. I began pulling it apart and I noticed that reverse gear and shaft wouldn't engage. Then I noticed that the gear actually slid back and forth on the reverse idler shaft. Is it supposed to do that?! Is there a bushing or snap ring missing?? If you have any info. Please help. Thanks.  
Good trucks are built not bought.

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 08/15/13 12:08 AM

there is  a reverse clutch fork to slide the reverse gear in and out ... if the gear is in the wrong position when the cover is installed. it may not go into reverse.

Sm465shiftercoverforks Zps2033ec6c

the long shift fork engages in the groove in the reverse slider...

some of the various 4 speed like these.. might need the cover components replaced to tighten up the slop in the shifter levers..  

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 08/15/13 12:09 AM

the 465 as i recall has a sliding reverse idler.. to engage or disengage reverse..
#53 and #54 in this diagram...

Sm465diagram Zps500e4bdc

perhaps this will help..

there used to be some articles over in the truck magazines on this.. but a few weeks ago.. they changed the format.. and most are missing..  

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ChevyMan84.
I love my Chevy Chevette!
Posts: 7
Joined: 08/13
Posted: 08/15/13 05:16 AM

Ok that makes so much more sense now. Thanks so much for the info. I found that diagram a few days ago and have been using it as a reference ad it helps alot. Thanks for the reply.  
Good trucks are built not bought.

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ChevyMan84.
I love my Chevy Chevette!
Posts: 7
Joined: 08/13
Posted: 08/15/13 05:20 AM

Is there anyway you would know if I have to do mods to te drive shafts? It has a 350/t350/np208 combo right now. I plan on changing the t350 for the sm465 I'm building. And other mods u can think of would help. Thanks!  
Good trucks are built not bought.

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 08/15/13 09:51 AM

i may be wrong completely..

but does the transmission tunnel unbolt in your cab???? to expose the whole top of the transmission...  

i seem to recall that automatic transmission cabs have a complete floor...

the manual transmission cabs have a floor with the removable panel...

might be something you may want to cut the floor out of a junk yard cab..  cutting around the removable panel.. so you can cut your floor and screw.. rivet.. weld. this mounting flange in...  if your truck is not already equipped..

a hint when i used to do clutches a lot.. back in the early 80s..

3 or 4 long bolts.. grade 8..  so i could slide the transmission back on them to access the clutch without dropping the transmission..

you will want a set with the heads of the bolt cut off and  ground to a slight taper on the cut end. so you can slip the transmission onto them and guide it in without it hanging on the input shaft..

and i am not sure about the 4x4 versions.. but i do recall the one ton versions had a complicated cross member with many bolts to keep the frame rails square with each other..

since you will have the carpet out .. you might want to also coat the floors with some bed liner material.. to prevent rust thru..  

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ChevyMan84.
I love my Chevy Chevette!
Posts: 7
Joined: 08/13
Posted: 08/15/13 10:52 AM

No mine came with a 305/700r4 combo ad the owner b4 me put a crate 350/th350 combo in it. I bought it for 2 grand ??.anyway I read that the sm465 you don't have to cut the floor. And I have used that trick with the bolts countless times to do clutch jobs and so forth. Glad to kno I'm not the only time saving mechanic in the world lol. Also the sm465 came stock as an option in my truck. And I know that there is an inprent in the floor for the shifter. So I should just be able to cut out that hole and run the shifter threw?  
Good trucks are built not bought.

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ChevyMan84.
I love my Chevy Chevette!
Posts: 7
Joined: 08/13
Posted: 08/16/13 06:50 AM

Does anyone know any advantages/disadvantages for slip yoke vs fixed yoke on a np205 transfer case? I found 1 of each for sale and there the same price. Which is better/stronger/less likely to cause problems?  
Good trucks are built not bought.

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 08/16/13 10:18 AM

there was a big change over in the offroad trucks magazines..


but a lot of the articles are still available..


there are several that you might want to look thru on this search..

http://www.fourwheeler.com/search/?q=slip%20yoke%20NP205

including one that described how to build a really strong NP205..  

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waynep712222
I have an SS396 tatoo
Posts: 251
Joined: 03/13
Posted: 08/16/13 10:28 AM

sure looks like people are going to the bolt on yoke..  with slip joints in the drive shaft..

probably so the fluid does not leak out if you break a drive shaft out and have to remove it and drive with just the front wheels..  

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ChevyMan84.
I love my Chevy Chevette!
Posts: 7
Joined: 08/13
Posted: 08/16/13 11:59 AM

About how much do you think that driveshaft would cost me, I'm leaning towards the fixed yoke  
Good trucks are built not bought.

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zman123
Everything in my driveway’s a Chevy
Posts: 537
Joined: 06/08
Posted: 08/16/13 08:14 PM

A custom driveshaft will cost between $300-$400  

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ChevyMan84.
I love my Chevy Chevette!
Posts: 7
Joined: 08/13
Posted: 08/19/13 05:01 AM

Think il stick with the slip yoke for now. Buddy of mine said if I didn't like it that we could swap my slip yoke for he's fixed. Thanks for all the help guys.  
Good trucks are built not bought.

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