12-30-2018, 06:45 PM
The differentials of our vehicles are often overlooked and underserviced, but they are not immune to this, and NOt inexpensive to rebuild.
There are a lot of extra capacity differential covers out there, intending to both reduce the workload on the gear oil and cool it better, but most of these disregard fluid dynamics, and instead of the gear oil following the ring gear around in a nice circle, the squarebacked extra capacity covers allow the ring gear to sling oil into this cove like shooting a hose at a wall at a 90 degree angle, instead of nearly parallel with it.
The guy in the link below is basically setting up videos to ultimately sell a product, but he is collecting data, and not just spoutin theory which I respect, as there is so much theory that in actual use does not hold up, yet is time honored and spouted as gospe and repeated ad nauseam reaching legendary status, and has stories sung from the hills about it.
I find it interesting just how quickly the gear oil gets whipped into a froth.
https://www.youtube.com/watch?time_conti...-yG3D3JBRs
He then has a video with an extra capacity square backed cover too.
He does not share the temperature data he gathers, or at least has not yet.
My opinion is the extra capacity square backed covers are likely doing no harm, but are not giving the purported benefit they say they are.
A drain hole would be nice to have, but I'll be sticking with the stamped steel cover which came wth my 9.25 chrysler differential and use a synthetic gear oil changed at about 35K mile intervals. BUt if I were worried about differential temperatures, I would sticker it with aluminum heatsinks in true OCD fashion and go from a 75w-90 to a 80w-140.
My chrysler 8 3/8 differential did wear out. badly pitted spider gears. Likely lube failure related.
I was quoted 1300$ to rebuild it. I got a junkyard 9.25 for 500$ but then had to spend nearly 800 having new bearings installed in it.
Anyway I though this Video was interesting and wanted to share. Perhaps it will remind somene to not ignore thier differential and save them 1200$+ in rebuild costs.
There are a lot of extra capacity differential covers out there, intending to both reduce the workload on the gear oil and cool it better, but most of these disregard fluid dynamics, and instead of the gear oil following the ring gear around in a nice circle, the squarebacked extra capacity covers allow the ring gear to sling oil into this cove like shooting a hose at a wall at a 90 degree angle, instead of nearly parallel with it.
The guy in the link below is basically setting up videos to ultimately sell a product, but he is collecting data, and not just spoutin theory which I respect, as there is so much theory that in actual use does not hold up, yet is time honored and spouted as gospe and repeated ad nauseam reaching legendary status, and has stories sung from the hills about it.
I find it interesting just how quickly the gear oil gets whipped into a froth.
https://www.youtube.com/watch?time_conti...-yG3D3JBRs
He then has a video with an extra capacity square backed cover too.
He does not share the temperature data he gathers, or at least has not yet.
My opinion is the extra capacity square backed covers are likely doing no harm, but are not giving the purported benefit they say they are.
A drain hole would be nice to have, but I'll be sticking with the stamped steel cover which came wth my 9.25 chrysler differential and use a synthetic gear oil changed at about 35K mile intervals. BUt if I were worried about differential temperatures, I would sticker it with aluminum heatsinks in true OCD fashion and go from a 75w-90 to a 80w-140.
My chrysler 8 3/8 differential did wear out. badly pitted spider gears. Likely lube failure related.
I was quoted 1300$ to rebuild it. I got a junkyard 9.25 for 500$ but then had to spend nearly 800 having new bearings installed in it.
Anyway I though this Video was interesting and wanted to share. Perhaps it will remind somene to not ignore thier differential and save them 1200$+ in rebuild costs.