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SM 465 Shift Fork Coating

K5-CJ5

K5-CJ5

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I know it has been discussed but to my knowledge no cure aside from a fork replacement.

Has anyone tried a bed-liner type coat for a cure, or a plastic dip to replace the worn fork pads?

Any thoughts would be great, if not I think I will try some type of formula to dip the forks in because it seems like a major waste to replace the entire fork because of 1 inch of coating.
 
Any dip/spray coats I can think of won't hold up. There are others I am sure I am unaware of. GM appears to have used a dip.

It looks to me to be some sort of teflon or teflon-like coating. Whatever is used needs to be very slippery (and hard), as the shift collar will tear even the fork metal up if it makes contact with it, and the dip coatings I am aware of are far too soft and "grippy" to hold up to the rotation of the shift collar.

My intention was to come up with a way to machine the fork to take some sort of shift pad (similar to what the NP208/241 use, as well as the T56, among others). Unfortunately, without knowing the specs on the various pads that already exist, it's impossible to determine if any of them are likely candidates. We just need to find a pad that will fit in the shift collar, and be adaptable to the 465 shift fork with minimal work.

Otherwise, $40-60 forks are the only viable option IMO.
 
Doing more researched showed that it is a teflon coating. The iron has to be heated to 400 deg, then dipped into the liquid teflon. I have emailed a company that specializes in teflon coatings for boeing and aerojet. The coatings are chemical, friction and heat resistant. Far more than this application requires. I hoping that I get an answer back during the week and can find a way to purchase a small quantity of the material.

If anyone has other ideas keep them coming. I will look into the different fork pads that are available and see what would be required to adapt the 465 shift forks.
 
Might need to inquire about how thick the coating can be made. I'm not sure if that sort of stuff you can just re-dip until thick enough, or if you get one shot at it?

Not sure what your reasoning is on getting them re-coated, but I tend to side with the opinion that the lack of coating is what causes the 2nd gear pop-out, and if that theory is correct, coating thickness is critical.
 
dyeager535 said:
Might need to inquire about how thick the coating can be made. I'm not sure if that sort of stuff you can just re-dip until thick enough, or if you get one shot at it?

Not sure what your reasoning is on getting them re-coated, but I tend to side with the opinion that the lack of coating is what causes the 2nd gear pop-out, and if that theory is correct, coating thickness is critical.
Click to expand...


It was part of the email I sent. It seems that you can apply thicker and then sand down to proper thickness. I need to order a new shift fork and see what the thickness is when new to determine how thick it need to be.
 
Look into a material called Turcite.

It is used a lot in applications like that. I did some research on it a few months back, because the ways on a surface grinder used it and it needed to be replaced.

In that application, it was glued with a special glue after the surface had been roughened.

If I remember, it was Turcite B for that, but I think your application would do better with Turcite A.

But I may have that backwards........
 
not sure but, there are some chemical dips that I found when looking up turcite that Fordum recommended. The turcite seems like it would be a great product to use as well, however its much cheaper to get the new shift forks as you have to get the turcite in a 48x48" sheet at about 3k.
 
Yeah, I suspect thats why new forks are the only option right now.

I am curious if they are still making forks, or if not, where the supply of new ones is coming from, and if it's going to run out. :(
 
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