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  1. 1

    50hp Mercury 500 lower unit swap

    I have a 1974 50hp Mercury 500 ser#4073302. My lower unit is locked up I have found one but it is listed as being from an early seventies red stripe 50hp with 11 splines on the drive shaft mine has 13 splines. I thought the redstripes were merc 500s also. If anyone could shed some light I...
  2. 1

    1974 Mercury 500 Thunderbolt lower unit swap

    I have a 1974 I believe 50hp Mercury 500 Thunderbolt Serial #4073302. The Lower unit I want to use is from a 50s model 50hp mercury. Everything looks the same except for the replacement doesn't seem to have the Reverse shift cam or base on the shift rod just the bushing that has the slot thru...
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