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Sychronized NP205 Fork Pads

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pseudomike

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Anyone here got a part number or exploded view of the synchronized GM NP205? I am looking for the Teflon fork pads in particular. It uses a different fork on the front output unlike most 205 cases.
 
They started in 1982-1984. Supposedly GM had a surplus of them and used them in K3500 truck up until '88...generally the K3500's with auto locking hubs. I have one out of an '85 K3500 I am trying to overhaul. The major difference is on the front output side where it has a different fork. So far my local drive train shops are looking at me like I am speaking greek claiming that there is no such thing. I did find a diagram, and it does in fact exist, but i still have no part number. There are three small teflon pads that slide into the fork. Mine are toast. I will get a copy of the diagram momentarially.
 
Aren't they part number 2381963?

Interesting, they are shown with the manual hub 205 diagram.

They are showing as still valid on GMPD. If you have to get a pack of 5-10, probably could sell them here. They might be one of those things that is cheaper locally due to shipping. :(

Yep, like $15 for a 1.93 part.

I hate "experts" who don't take the time to use their resources. Which is why I bet many of us don't let others work on our vehicles.
 
How about "my resources never cease to amaze you?" lol. I don't have to remember anything, except where to look.

Hope that helps. At least they are still available.

When you get them, maybe post up some measurements. I'd love to find something like that which could be "retrofitted" to the 465 shift forks with little work. The car transmission ones I've got my hands on are way too thin.
 
Ok, called the shop back, number translate right over $0.61 each. He said he has about 800 hundred of them in stock...same tabs used in the 405 tranny synchros if that means anything to anyone.

Thansk again,

Mike
 
Ok, they measure 1/4" wide, 5/8" long, and have a slot ~1/8" where the disc runs (channel shaped). They also have two retaining tabs each. For those in need of them they are also found in the NP435 4spd transmission (ford, dodge or chevy?).
 
I wonder if anyone is paying attention other than me for the forks. :)

I have a feeling 1/8" is quite a bit thinner than the forks are currently. Would be nice to have replaceable pads instead of the coating that wears off. But they sound like they would have pretty good contact with the components being moved due to their length.

Thanks, I'll keep this post in mind when/if the 465 shift fork issue ever comes back up.
 
It's been a while, but I think the 465 fork is similar to the 205 rear output fork in that the fork rides in a groove on the shift plate. The fork I was dealing with was somewhat the opposite, the shift plate was a single "disc" that ran inside the fork...and the Teflon pads insert into the fork if that makes sense? Perhaps I'm wrong on the 465 as it's been a while? You could always swap that Np435 in and solve the problem? I did notice that the rear output fork in the 205 which I think is designed like the 465 had significant wear whereas the front output fork had little or no wear other than the Teflon pads were very brittle.
 
I think I understand what you are saying. I believe the 465 forks could be modified pretty easily to take pads, IF the right pad could be found. Done on a scale large enough to make it worthwhile, a "mod" to the forks wouldn't be that expensive I'd think.
 
I would presume one could machine some pads out of nylon/teflon for the job that would slide onto the forks? Somewhat of a project but a lot cheaper than forks.

On another note, I remember in a previous conversation we were talking about a VSS in the 205. Well, as part of this little project I decided to tackle the VSS issue and my only concern is the clearance between the sensor and the reluctor ring. IIR you had mentioned .005" clearance but that seems a bit tight. I've been scouring hte internet for an answer and the only thing I have found are some instructions for AA and others for coversions. AA was throwing .012" +/- .002" out there using a GM sensor and NP241 reluctor ring. Another kit I saw said .030". IIR you said yours ran so close that it appeared to be hitting sometimes. I'm thinking I may shim mine out to say the .030" mark with some gasket material and give it a whirl. I can always shim it back in that way? Any thoughts? I'm going to try mocking the 241 back together to see where it sits as well.
 
Problem with the 465 forks is that they aren't really flat. My thought is the forks would need machined flat, THEN a pad could be used. You'd need to drill the locating holes for the pad retaining dimples too.

As to VSS, yes, it sure looks to me like the reluctor has hit at one point in it's life. Since GM used a gasket on the VSS, I can't imagine it's a SUPER precise distance. There would seem to be some real tolerance problems, since the output shaft has an endplay tolerance greater than zero, and nothing in the assembly was probably put together and "indexed" to make sure the VSS was X distance. I'd have to look in the '91 service manual, but I bet replacing the VSS simply says unscrew and insert new, no measuring or anything.
 
I'd say that I have all of .005" of play with brandy new bearings. I'd bet my slip yoke NP241 is no better.
 
Are you converting an NP241 over? Since the 241 came with VSS, isn't it just a bolt together deal?
 
I'm scavenging the parts out of a 241 for my 205. I got it all buttoned back up last night and it looks like I ended up with about .010" between the sensor and reluctor. I guess we'll see how it works.
 
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