mark79,80

Some say to only fill the steering gear box 3/4 fill as the grease will expand when heated, and if the box is full the grease will blow out the seals.

Other articles say to remove the lower and middle bolts and pump in grease until it shows at the bottom threads of the middle bolt hole.
A modified bolt with a zerk fitting is sold for that use.

I have been using this method by removing the grease coupler from the end of a flexible grease hose and inserting the threads of the hose into the box. I use a good quality chassis grease. I figure that this method fills the box not as tightly as using a zerk fitting on a modified bolt and should allow a bit of room for the heated grease to expand.

What is the level to fill the steering box?

MelWff

the factory method is to remove the two bolts, look in the shop manual to confirm.

7T1vette

If you fill it with liquid lube, letting it 'blow by the seals' might work, but it is a helluva way to service your car.

It would be much better to fill it with gear grease MOST of the way (leave about 1/4" air gap) so there is room for the grease to expand when it heats up. I prefer using a good full-synthetic gear grease so that it WILL NOT melt when hot and so that it WILL NOT separate or oxydize over long periods of time.

mark79,80

I have the 1980 Service Manual and could not find any instructions for filling the steering box.
It says the box is filled for life.

Faster Rat

I bought one of those grease fittings to insert in the lower cover bolt hole...then pumped it in. That was before I sent the gear out for rebuild. I was told it was overfilled and to throw that damn fitting away.

marshal135

I used that fitting w/o a problem.
I removed the other bolt to observe level.
I used a power full flash light and blue HD chassis grease.
The blue shows up really well using the light.
Marshal