Spoke to Speedway they Normally do run a inner axle seal including snap rings on both sides of the seal on all the NASCAR housings. That being said he has not seen any failures since 1993 when they changed to a different type of diaphram seal. BUT did say that is would be possible if the housing was bent or "rubbed" as the seal is quite delicate and also can be damaged during assembly if the axles being used do not have a large enough taper on them. that is the official answer.
Also the housing has axle seals at the housing ends. so the inner would not be required.
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