I have a 1988 4+3 corvette. I am going to change the filter in the overdrive unit.how much fluid do I have to put back in. also do I have to rotate the rear wheels to fill the unit to be completely full. first time doing this any help is appreciated. thanks mike

 

I don't know the exact amount of fluid. However, when you change the od oil fluid and filter you remove the pan then change the filter. After you get the pan back on you remove the 'fill plug' from the side of the O.D unit and fill it until the fluid level reaches the fill plug then replace the 'fill plug.'

I would guess it is 2-3 litres of fluid not sure on the exact amount but it is a fairly simple job. Hope that helps you out.

 

Exactly, just a suggestion. Break loose the fill plug before you drop the pan. This will eliminate the possibility of not being able to fill an empty unit. I have had good success with RTV on the pan, just let it set up

 

That's a good suggestion about removing the fill plug first.

 

3 qts will be a little more than enough. It wouldn't hurt to spin the wheels (pump) to get any air out, but it's usually not necessary unless you blow out the cooler lines.

 

All great advice so far. Spinning the wheel to circulate the new fluid and expell air pockets is a must in my opinion. I always do it.

 

If the Fluid is Nasty Burnt (Black & Smelly) I would make it a Point to Blow out the lines otherwise you would be putting a 1/2 Quart of mud into your work.

 

Get 3 quarts of Dexron III ATF (non-synthetic) fluid and that should be enough. The cooling lines hold maybe a pint. If you want to do a complete flush, remove both lines from the OD unit and use a very low amount of air pressure to blow the old fluid out. Re-attach the lines.

With the pan off, make sure you remove all traces of old sealing material like cork gasket or RTV sealant. Check the pan rails and make sure they are straight. Remove the magnet from the pan and clean it then replace back in the pan. Install the filter and put the pan back on. Tighten the bolts evenly. On my old '87 4+3 coupe, I used "The Right Stuff" sealant. Another good sealant is the basic MoPar RTV Sealant that you can get at any Dodge, Chrysler, or Jeep dealer.

The filter is the same one used on some Ford "FMX" auto trans that came in some Fairlanes, Mercurys, some Mustangs and even some F-150 pickups.

The p/n's should work and are much cheaper than the various accessory catalogs:
Advanced: (Carquest 85926)
AC Delco: TF184
Fram: FT1024
NAPA: ATP14717
Ford: D0AZ-7A098-A

Note that these filters do not include the rubber grommet but you can remove the old one and transfer it to the new filter.