Differential axial check plug
Reply #5 –
The 7.5 and 8.8 absolutely have a fill plug. And to my knowledge so does every final drive i would think. If for some reason you cant find the plug and or if it wont come out. You can buy a rear cover that has one. I install a plug some times in covers to increase the oil capacity. Chevy's with floaters need more fluid as they tend to starve the bearings of oil. I now install a plug extender that is a 90* street EEL to accomplish more of a fill on those axles. Fill the diff till the fluid just starts to run out the fill plug on a level surface. Or on the lift!!