Refilling a J30 diff in-car

[phuz]

Does anyone have a clever way to refill the fluid while the diff is still in the car?

I pulled the input flange out today so I could shave off 22 of the 23 teeth on the ABS wheel and I lost about a pint of fluid. I had the front end jacked up pretty high, but still lost a decent amount. Afterwards I went for a 1 mile test drive and by the end, the diff was whining pretty loud. I need to get more fluid in there before I drive it again and I'm hoping I don't need to drop it to do so.

[waxdnuggz]

Theres a tool you can buy from a parts store that screws ontop of the gear oil bottle. Its like 4$ tops. Either that or get a long peice of oxygen hose or of the like (about 3ft long 4 would be better. Have someone hold one end into the diff while you stand up with the bottle and the hose pressed over the tip of the lid (if its the cone shaped lid like usual. And just turn the bottle upside down. Dont squeeze too hard or the hose will come off. you have to have the bottle higher then the diff or youll make a mess and it wont work. Fill until the fluid reaches the fill plug and starts to trickle out and done

[phuz]

Thanks. I'm hoping I didn't do any damage to the LSD over that one mile.

[waxdnuggz]

If it really was only 1 qt and 1 mile you should be fine