Hi Larry!,
One reason that this could happen; Is first, did you get your housing from a reputable dealer, or just buy it from a private party? Reason I bring this up is because some people advertise their junk as good usable stuff. I will also mention the straightness of the axles. Not that this may be the cause of your problems if your axles are straight; But because some people don't keep track of these things until it has damaged the housing, or whatever part. Then they sell it off as spares or good, usable parts. This happens in all types of racing.
Steve