How To: C15a Wire-3 restoration

[rob love]

Originally Posted by Jordan Baker

I haven’t looked that far ahead yet for what oil I’ll use. My Willys MB seems to like the 80/90 transmission hypoid oils.

Not all hypoid oils are the same. The most current spec of hypoid is GL4 edited to add: now GL5) which is reported as harmful to brass. Not a problem for your Chevy crash box, but any transmission with synchro rings may not have a happy ending.

What belongs in those is GL1 or possibly GL3 specification. Tough to find...ask any Dodge Diesel owner with a manual transmission. I ended up using royal purple.....expensive, but cheaper than removing and repairing the transmission.

Bob: I always considered the oil leaks on a chevy quite standard. Many of them here at the museum feature multiple drain pans underneath them.

[Robert Bergeron]

Rob/ Jordan : Gl4 could explain the early demise of the 2 nd gear and it’s brass syncro ring in my GPW transmission a couple of years ago ...

[Lynn Eades]

A friend of mine is just replacing a new jeep trans. with a new jeep trans. (1000km) Reason: Incorrect oil. The Hypoid oil ate the bushes in the cluster.

Jeep has bronze bushes inside the cluster gear (counter or lay shaft) and the reverse idler as well as the synchro (baulk rings) The Dodge (New Process) and Ford 4 speed crash boxes have a bush in the reverse idlers. I assume the G.M. box has bronze bushes in the reverse idler as well.

Also, bead blasting is great for the gears as stated, but!.... Total cleanliness is absolutely imperative, after blasting. It gets everywhere!

On both counts, Beware!

[Wayne Hingley]

Hi Rob: Is this the Royal Purple product you are using? In your research, did you find any other non-EP gear lube options?

http://www.royalpurpleconsumer.com/p...mission-fluid/

[Jordan Baker]

Today I took apart the top of the transmission. It was in dire need of some cleaning on the outside and at the base of the shifter. Some very very thick crudy grease. The inside looks great though. Everything came apart nicely. My only concern was that the reverse shifter yoke looks worn.

It’s part number 4.303 GM590515 Yoke reverse shifter.

The parts are all soaking in parts cleaner to help soften the hard grease.

[Alex van de Wetering]

Great work again, Jordan

Now the hard part what colour to paint it? From what I have read here on the forum they may have come Chevy grey, semi gloss black or even have been painted the final body colour of LG#3, SCC2 or SCC15

I also painted mine grey recently....and just like you I thought that would be great for spotting leaks, but I am now thinking about respraying it body colour...as that's what i think I am seeing on the factory pictures.

Alex

[rob love]

Originally Posted by Wayne Hingley

Hi Rob: Is this the Royal Purple product you are using? In your research, did you find any other non-EP gear lube options?

http://www.royalpurpleconsumer.com/p...mission-fluid/

The Q&As at the link you show says it is fine for the soft metals. I am using the 75W90 that is available at Cdn tire. My transmission shifts nicer with it, and everything I could find on it was that the synthetic was fine for the synchros.

I think Boss lubricants still sell GL3. Seems to me Dodge and the other likely will too, but pretty sure theirs will be as much or more than the Royal Purple.

[Jordan Baker]

I went out and checked on what I’m using. I was mistaken. I’m using the 75/90 stuff from CND tire as well.

[Wayne Hingley]

Thanks gentlemen. I looked up the info on the Royal Purple (Max Gear) 75w90, and it does mention that it is yellow metal safe. Ill be switching my lube this weekend.

I suppose the same would be true for the steering box, PTO and winch lubes. Is there any yellow metal in the differentials?

http://www.royalpurpleconsumer.com/products/max-gear/

[rob love]

Originally Posted by Jordan Baker

I went out and checked on what I’m using. I was mistaken. I’m using the 75/90 stuff from CND tire as well.

When I said "stuff", I was relating to the royal purple....not the Cdn tire house brand.