68 C-20 Yearly Maintenance?
 

I'm putting my C-20 away for the winter. I've changed the oil. Can anyone advise on what all I should grease (don't want to miss anything), and what I should check? I'm thinking I should change the transmission oil (3 on the tree). What does everyone use for that? Is there anything else I should inspect while I'm at it? The previous owner mentioned that the dealer would pull the rear axles every year to check the brakes, which seemed strange, but I guess after looking at things that must be what you have to do.

Any advice would be appreciated. Thanks!

Wes

Re: 68 C-20 Yearly Maintenance?
 

You can demount the drums to inspect the brakes, at least that is the case on the Dana 60 in my truck. No need to pull the axles, that's just going to be a cost upper for seals.

Engine oil, by the service manual- Change oil each 4 months. If more than 6,000 miles are driven in a 4-month period, change oil each 6,000 miles.

Diff, by the service manual, drain at 24k mile intervals.

Same manual, no indication of when the transmission oil should be changed. It's been long enough since I worked on one, I don't recall if mine had a drain plug! If yours has a drain plug, the diff mileage of 24k miles might be OK, but you should wait for others to chime in.

Re: 68 C-20 Yearly Maintenance?
 

I have never heard of the need to change all the fluids and pull axles yearly but maybe if someone have the need to get out away from everyone else and spend the winter wasting time that could be a thing.

As for storage, I would do the oil change and maintenance checks before driving and not storing, but give it a good clean, add some gas saver, top off the coolant, close it up tight and if stored outdoors, carport or shed maybe some kind of rodent repellent, if there is sure a thing, along with some cardboard underneath the truck to start with for a week or two checking now and again to see if anything is leaking and call it good.

Fall and Winter time here in the PNW is my favorite time to drive if it dry and there is no snow.

Best wishes.

Re: 68 C-20 Yearly Maintenance?
 

On an Eaton axle the drums are mounted to the backside of the hub. So yes to inspect the brakes you must pull the axles & hub.

Re: 68 C-20 Yearly Maintenance?
 

After over 50 years of neglect anything that has oil or grease of some kind needs service.

Re: 68 C-20 Yearly Maintenance?
 

This must have been what he was referencing. What's involved with this? Do you need to replace seals each time?

Re: 68 C-20 Yearly Maintenance?
 

Can anyone suggest a proper oil for the diff and for the manual transmission? I use Redline MT90 in my 73 Triumph GT6. The selector on Redline's site shows 75w90 for the rear diff, but does not suggest one for the transmission.

Re: 68 C-20 Yearly Maintenance?
 

The trans fluid needs to be GL-4 rated. GL-5 oil can damage brass parts in the transmission.

Re: 68 C-20 Yearly Maintenance?
 

Not true for all Eaton axles.

Re: 68 C-20 Yearly Maintenance?
 

Yes. But true for these years of truck.

Re: 68 C-20 Yearly Maintenance?
 

My 68 c30 with the 11000lb rear begs to differ ;)
not applicable to the discussion but eh :lol:

Re: 68 C-20 Yearly Maintenance?
 

I agree with your procedures. The main procedures should be when winter is over, just before you want to drive it after sitting. But here in the PNW we don't need to really winterize, just ensure fluids are there and coolant is at a safe zone. ...and take them out on those hit/miss nice winter days

Re: 68 C-20 Yearly Maintenance?
 

My cars are in a heated building, so I've always just done the maintenance when I put them away for the winter. I guess it probably does make more sense to do it before driving in the spring. Perhaps I'll change to that timing next year.

Re: 68 C-20 Yearly Maintenance?
 

This being the case, aren't there inspection holes in the backing plates?

Re: 68 C-20 Yearly Maintenance?
 

Grease is a loaded question. For instance, I have in the neighborhood of 24 zerk fittings. If I remember right, my factory (1971) C10 had 18 of them. Then there's hinges, bearings and such, I don't suppose you mean those. Short answer for zerks is front suspension, lower steering from the box down, and drive-line.

Brakes depends on the miles put on it right. Seems odd he checked them every year, but what do I know. Maybe the prior owner was just careful and took advantage of an annual service.

Re: 68 C-20 Yearly Maintenance?
 

I honestly don't know. I never really looked at them. Pulled all the brake parts off & replaced them with brakes from a 14 bolt. Now you have me wondering?

Re: 68 C-20 Yearly Maintenance?
 

If you drive the truck fewer miles then needing to change the oil based on mileage, it's recommended that you change it before you put it away for the winter. There are acids created as a byproduct of combustion that make it worthwhile to store it with clean oil. In the Spring you can drive it on the oil that's been sitting in it all winter if you want to, or you can change it again. Point being, if you just change it once per year, changing it in the Fall is better. Other than that, I would check the coolant and make sure it's good for whatever temperature is necessary. And the other items I would do on maintenance intervals, not based on the season.