3rd member talk (ring&pinion setup etc.)

[Ivan141]

Yes, heat is probably the biggest problem, but then the question is: what gets damaged/out of spec and causes the whining?
I have been looking around a bit at different solutions to differential overheating, here's what I've seen so far:

-Increasing oil capacity. Richmond gear recommends people to cut out the oil filler plug on the axle, and reweld it a bit higher. This makes sure there is enough oil in the diff, even during prolonged high-G exposure.

-Increasing capacitiy the other way, there is this build-up thread of an N2 spec ae86 coupe where the rear axle housing is modified to allow more oil in it. A sort of protrusion is welded on the rear of the axle for that purpose. I have also heard a similar story from a guy that used to race a KP60 starlet

-Differential oil cooler.. like for instance TE71corolla here on the forum has. This is a very nice solution, but a bit difficult to do, expensive and increased risc of failure due to the extra complexity/exposed bits...not what I would want on my daily driver.

I might just do that oil filler relocation trick, if it cant do any harm I can afford the extra oil.