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Stupid transmission question
11-17-2013, 04:44 PM
Post: #1
Stupid transmission question
Hi guys, I've got a 76 Eldorado and am doing all the maintenance possible to keep it running. I'm about to replace both half-axles, and figured it would be a good time to replace the fluids associated with that. The only problem is that I don't know which fluids are...

This is an automatic transmission, so I don't know this, but will I need to replace gear oil or just automatic transmission fluid? So if I drain my transmission and put fresh fluid and a new filter in, will I also be lubricating my half axles?
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11-17-2013, 09:39 PM
Post: #2
RE: Stupid transmission question
Been MANY years since I did any serious work on a Caddy of that vintage so I can only give you common sense info.

First: Whatever comes out when you remove the axles is what you will put back in. ATF will be red in color and old fashion gear oil will be rather dark, have that musty smell, plus it will flow like cold honey.

You may be able to figure it out in advance by looking in the owner's manual to see if there's a listing for the refill capacity and type, otherwise you can look at the bottom of the trany to see if there's more than a single cover plate. (one for the dif?) Do not drain anything unless you can find where the refill point is!

Now, I recall on the older ones (mid 60's?) some had "bolt-on" type flanges at the trany end so nothing is lost during the job. If the axles pop out with a crow bar then oil will usually be lost.

Just a pointer... the axle joints are not lubricated by the trany oil if they are enclosed in a rubber boot. Typically this means there's a special grease inside. Replacement axles will come with new boots and new grease already installed. If you are buying parts and doing the rebuilding yourself then that's another story.... a messy one!
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