Lower unit swap.

A

Armed_icebear44

Cadet
Joined
Nov 9, 2024
Messages
8
I have a 1983 25 HP Johnson. The drive shaft snapped and the some of the bolts that hold the lower unit on also snapped. ( Didn't hit anything at anytime since Ive owned the boat, it was runing normal then just went into what seemed like neutral.) My buddy has a 1981 evenruide 35 HP with a busted power head but new lower. Was wondering if they are compatible. If read on some other forums that they are and others they are not. Just looking for a solid answer.
 
R

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,870
The lower units are NOT the same.------Will not fit.-----You can look into swapping the powerhead over.
 
R

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,870
Driveshaft's have a different part #-----Therefor may not swap over.----Put the 2 driveshafts side by side and compare them.
 
6

62Scout

Petty Officer 3rd Class
Joined
Sep 18, 2017
Messages
93
I'd sure want to know WHY it broke before I start going down the road of throwing parts at it...it would take an awful lot of force to snap a driveshaft, like say something causing the prop to come to an instant halt from high speed.

One of my parts motor has a sezied gearcase from the PO not keeping up on an oil leak, causing the oil to be 100% replaced by water. "Was running great one day...then just stopped like it hit something under water...". Still didn't break a shaft.

I'd be thinking you've got something else broken in that lower unit that caused it to immediately seize...
 
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