posted November 19, 2002 11:22 AM
from speedway engineering's FAQ section...
>How much and which oil do you recommend for your rear end units?<
"We suggest you use a good grade oil, 85-140 wt,. such as Mobil 1, which we use on our house car. Never fill the Quick Changes or Ford housings any higher than bottom of 3 in axle tube. We do install level checks, at that point on all our Quick Changes and Floater housings. On the Quick Changes this is on the right side bell and/or on the center spur gear case. On the Floater Housings, the level check is on the back cover."
PS... a drain plug should be installed facing down (or back at the bottom is fine) and the fill hole should be slightly higher than the level plug on the carrier.
speedway engineering feels that a large vent is not required (they ship their housings with a stock size ,1/4" NPT IIRC, vent hole)
and remember if you are going to put in inner (tube)seals .... you need to use axel grease on the axel/hub bearings.