Generally the 31 spline carried the 3.0625 bearing caps. Ford at one time offered a bearing called SlimLine for use in the 2.893 units for the 31 spline carriers. You will need to find a cap for the 3.06 bearing.
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Larry............
96 Ford F350 PSD CC DRW
64 Fairlaine 500 rust bucket/future Tbolt clone with 501 BBF
<font size=-1>[ This Message was edited by: Just Strokin on 11/26/05 1:47am ]</font>