The correct way to do a rear gear box oil change on a 360

Remove the rear bumper, open gear box fill port (12 mm allen head). This is also the dip stick.

Remove drain plug (14mm allen)

After draining, remove filter screen located on left rear side of gear box (8mm or 10mm bolt). This is the reason why the rear bumper needs to be removed to gain access to the filter screen. Clean the screen with some Brake Cleaner solvent..and rinse with water and dry it off with some compressed air.

Replace the copper sealing washer on the drain plug,and install a new o-ring on the filter screen housing. Install.

Fill gearbox with 4 liters of 75w90 synthetic. I use liqui-moly products. Reinstall fill plug with a new washer and snug it down.

Drive the car around the block and recheck the level. Adjust as needed. Final fill level should be 1/2 way between the min and max mark on the stick. Install rear bumper.

 

This, in general bumper has to come off unless you’re one of the folks that cut a hole in the diffuser for easier access. Which I personally am not a fan of


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Lots of these cars even 20 years on..have never had that filter inspected. Best to have a look if you do not have a service history. Even then..Best to have a look regardless. Lots of shops charge for it, but never do it

 

Tom is correct, most shops don't look at the screen. It takes too much time but that is the right way to do it. It usually is full of sealer from assembly.
I fill to the middle with the fill dipstick not screwed in. I then run the engine on the lift in gear a bit, that lets the trans oil pump run and then I re check the level and bring it to Minimum not screwed in.

 

I have taken out the back bumper 2 years ago to clean my filter. A PIA job without a helper.
However, I believe Ferrari Designers forgot to install this "Maintenance Port" for frequent gear oil changes.
Yes, I say this in jest but think of this; WHO did you think designed these other ports on the under-tray?

Just saying!

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Is this the correct way to check the gear oil level? With the dipstick not screwed in? Is it the same for a F430?


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It's the same process on the f430 minus the bumper removal. You only need to remove the rear diffuser section on the f430. Leaving the stick loose or snugging it down really is up too the person doing the job. As long as the end result is proper then no worries.

 

Thanks for the response.

I was commenting on the correct way to check the gear oil level. If it’s checked with the small dipstick screwed in, it will read differently than if it’s just resting on the threads. I’m just trying to find out what’s correct.


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There is no big difference in the level, whether you leave dipstick loose or tighten it..
I leave it loose.. you will be in the correct range either way.

 

Great, thank you. That’s the info I needed.

Happy Thanksgiving!


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Check the amount of fluid going in, I've never managed to need more than 3 litres in practice although some quote 4. And definitely undo the filler before the drain. That thing is tight and it usually needs a breaker bar and 1/2" drive hex to break loose (I use a long impact drive hex head). Don't over torque it doing it up either.

 

I would think just snug for the fill cap. Why the heck is it so tight? There’s no gear oil pressure, correct?


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The tightening torque isn't high, but there's something about the heat cycles and the crush washer that make that sucker very hard to crack open after a year or 2.