Roy Rothlisberger owns a machine shop and is an engineer that is serious about his work. When he came up with the Mag-Hytec cover, it wasn't made to pretty up the axle. With its thick, 1/2-inch lip and O-ring gasket seal, this cover is one of the best we've seen on the market. It also features an oil dipstick with a magnet and a drain plug assembly with a magnet to make changing oil a breeze. The cover is manufactured from 356-T6, high-grade aluminum and has a fitting for a temperature sender. It also features 1/4-inch fins at the rear that actually dissipate heat more efficiently. The cover holds 5 quarts of oil, allowing more of it to get into the axle and properly lubricate the bearings. The kit also comes with stainless steel, hex-head bolts, and installation directions.
Roy also manufactures a transmission pan cover that incorporates the same cooling and maintenance aspects of the differential cover. The cover is obviously much deeper than the factory pan and uses 4 extra quarts of transmission fluid than a stock pan. Furthermore, the Mag-Hytec pan also has a drain plug with a magnet on it as well as the same hex-head stainless bolts that hold it in place. The deeper pan uses a standard transmission oil filter that sits on a baffle, preventing any starvation, yet keeps dirt and grime away from the pickup.
For our installation, we used LE 607 heavy-duty gear oil and LE 7500 transmission fluid.
We took our '95 Suburban to B&F Auto Transmissions where the Mag-Hytec transmission pan and differential cover were installed. The installation was simple, and after driving around with the LE lubricants in the truck, there was a noticeable difference; the shifting improved and was much quieter and firmer than before.
We installed the Mag-Hytec rear differential cover on our '95 4x4 Suburban, which uses a GM 14-bolt, 10-1/2-inch rear. B&F transmissions in Panorama City, California, performed the installation at its facility. | 
Once the old oil was drained and the factory cover was removed, the Mag-Hytec cover was installed; no need for gaskets or silicone. The cover uses an O-ring and stainless steel bolts to hold it in place. | 
Roy suggested that we use LE gear oil. We used 5 quarts and added the friction modifier for limited-slip differentials such as ours. |
A close-up of the cover shows the drain sump that holds any foreign particles. Our rear antisway bar came close to hitting the cover but clears fine. Note the deep fins that actually cool the oil in the differential. | 
We also installed the Mag-Hytec transmission pan. The first step was to drain and remove the old pan. | 
We opted to put in a new filter, which goes in the stock location; no need for any extension tubes. |
Since the Mag-Hytec pan is larger, we had to unbolt and move the truck's transmission crossmember for clearance. | 
The finished installation looks great and will reduce the amount of heat generated in the pan. The use of the LE fluid also gave us a noticeable difference in shifting performance and smooth operation. | |