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  1. Finished up my PML diff cover about a week ago and figured I would post my thoughts on the part and the install. Overall the installation is easy. If you can change your oil, you can change your diff cover. Link to the cover: https://www.yourcovers.com/diffcover_11129.php About the cover: The PML cover increases the oil capacity of the rear diff by about 0.4-0.6 quarts. Part number 11129 comes in 3 finishes; standard silver, black powder-coat, and chrome. I opted for the black powder-coat cover. It fit well with my truck's theme and wasn't too showy. Its made out of aluminum and in conjunction with the cooling fins, allows your diff to run cooler. The cover fits the 9.5" ring gear in the standard rear diff and the 9.75" ring gear available with the max tow package. The covers comes with stainless steel allen head bolds and washers along with a plug for the fill hole and a stainless/magnet drain plug. Fit and finish were on point, not one issue with the installation. Install: Along with the diff cover you will need: 4 quarts of oil, 75W-90 Oil pump Drain pan Medium strength threadlocker (the blue stuff) Optional: RTV gasket maker if you do not want to reuse your OEM gasket Make sure truck is parked on level ground. Remove the (12) 10-mm bolts around the OEM cover. Remove all but two; leave one bolt finger tight on the bottom and one bolt finger tight on the top to allow a controlled drain of the oil. Inspect the OEM gasket, if you see any damage it should be replaced by RTV gasket maker. Use a razor blade to clean the mating surface of the diff cover making sure any oxidation is cleared off. Shouldn't be any if you were using the OEM gasket. Install the diff cover by carefully threading the bolts through the cover into the diff housing. Use blue threadlocker on each bolt. The bracket holding the emergency brake cable will need to be bent upwards to allow for cable clearance over the top cooling fin. Use the longest bolt in the pack in the hole for the brake cable bracket. All other (11) bolts are the same size. Tighten the bolts in a star pattern like you do with wheels. Tighten drain plug. Torque appropriately. Fill the diff casing by pumping oil. Continue pumping oil into the casing until it starts to spill out of the fill hole. Close up drain plug and wipe down the casing. If you used your OEM gasket you're good to go to drive. If you used RTV gasket maker than you should wait a few hours to let the gasket maker set up. And for good measure, here's my video of the installation! Again very happy with the cover. The cover looks great and is extremely functional for those of us that tow quite regularly.
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