I would think adding extra fluid would aid somewhat in cooling because you would be increasing the heat sink somewhat?
I had to pull the axles to replace the bearings which got me thinking about fluid capacity. My axles tubes do not have any internal seals in them. It seems like most of the fluid could run to one side or the other in a long sweeping turn and starve the differential. I have a DPI Black Gold differential. The unit took approximately 2.75 quarts before fluid began to flow from the front fill port. As a data point, I have a catch can that is angled in such a way as to drain back into vent line so I never lose any fluid. I called Griggs and spoke with Bruce. He stated that they run the OEM capacity and that overfilling it will result in leaks. It appears that the OEM capacity is enough to keep the differential lubed based on my research.
Adding alum diff cover / girdle adds legitimate fluid capacity and promotes cooling. You do not want to overfill your diff - if it leaks and ruins a set of brakes that sux.
Temp is of course determined by time/speed and tire height/gear ratio as well.
Be mindful of the fluid used. Lots of new synth fluids have less heat transfer capacities than the traditional dino based lubes. Hypoid gears present really heavy shear loads on the lubricants also.
I run an Eaton TrueTrac (Torsen style) diff and use old school conventional 85W140 with a 3.73 gear and a girdle. I think it holds 3 pints now.
Not a bad idea to change it fairly regular basis, just like all automotive fluids.
I call that cheap insurance, and you get a good look at the conditions of all your systems.
Since the fill method is to add fluid until it starts to back out of the fill hole, how could you over fill it? I would think the only way you could have more fluid is to use an aftermarket cover that was designed to allow more fluid capacity. In any event I run a stock cover in my IRS and run the s*** out of it on the track with no issues. If you have a cooler you would probably have to fill your diff., close it up, run the car, then add more fluid to make up for the fluid that fills the cooler and lines.
2020 MVP Track Time Schedule
Fellow Track Junkies and Racers:
MVP Track Time (www.MVPTrackTime.com) is excited to announce our 2020 track event schedule. Another fun year of exciting on-track action awaits. We have a host of exciting track events for 2020. I hope you’ll join us for the...
I am trying to figure out a strut tower brace for my fox but I don't think anything will fit with my Kenne Bell that has a bypass valve(which is part of the lack of room). Does anyone have one?
I am thinking about selling the blower to get a vortech so I can fit the STB.
Thanks to Mustang5L5 who posted a low mileage SPR ZK rack the other day, I embarked on the SN rack swap in my car.
I installed a low mileage 50k SPR ZK rack, reused my also new Solid Rack bushings, and bought the Maximum Motorsports swap shaft.
Prior to this, I was on the stock 4 cyl rack...
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