pre alpha lower unit

KJM

Lieutenant Junior Grade
Joined
Jul 31, 2016
Messages
1,186
i think the gears in my lower unit are shot, she skips in reverse badly now and even sometimes in forward, also often cuts out when i engage in forward. anyway the drive is a 1978 pre alpha . i think its a MR but not sure. i have ordered a old pre alpha lower unit on ebay from a different motor set up and am hoping it will still fit mine. does the engine size matter for lower unit? i understand the gear ratio is changed in the upper unit?
 

KJM

Lieutenant Junior Grade
Joined
Jul 31, 2016
Messages
1,186
so what would happen if the gear ratio was different? will the lower physically fit the upper?
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
40,581
If the two are the same ventage then they will fit together, just the ratio may be different. Maybe Bt Doctur can advise more
 
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