I blew the lower unit in my 2001 90hp Tlrz. The local boat repair shop has a 70Hp TLRZ lower unit available. Can I swap these two and if so, are the gear ratios the same?
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90 TLRZ lower unit?
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I say most likely.
90 has a 2/1 gear ratio. 70 has a 2.33/1 gear ratio. Use of a 70 lower unit might result in the need for a different propeller.
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