1996 3 Jaw vs. 6 Jaw Lower Units

E

EMC 1810SS

Petty Officer 2nd Class
Joined
Aug 20, 2010
Messages
176
I have a 1996 Mercury 75 3 cylinder. Last week the lower unit failed in catastrophic style.

I am contemplating rebuilding or replacing. This brings up a few questions. I have a 3 jaw reverse gear which seems to be much more expensive to find parts than a 6 jaw unit.

Can I put 6 jaw gears into a 3 jaw case? What other parts would be needed besides the gears and the clutch?

The next question, is a 6 jaw case a straight bolt in to my mid? or does anything need to change? I have heard the shift shaft is different but I have yet to isolate a separate part number.

Thanks for all of your help!
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,619
Re: 1996 3 Jaw vs. 6 Jaw Lower Units

Can I put 6 jaw gears into a 3 jaw case?
Click to expand...
Yes....
What other parts would be needed besides the gears and the clutch?
Click to expand...
Prop shaft ,shift rod and link arm
The next question, is a 6 jaw case a straight bolt in to my mid? or does anything need to change?
Click to expand...
Its a straight up bolt on but you have to change the shift rod and arm as throw is shorter..part # 79932A20
79932A20 | LEVER KIT-SHIFT | Mercury | Crowley Marine
 
G

GreenHornet763

Seaman Apprentice
Joined
May 30, 2011
Messages
36
Re: 1996 3 Jaw vs. 6 Jaw Lower Units

I have all parts for this lower unit, 1993 Mariner 90hp. Broken forward gear. My replacement LU came in friday. LMK
 
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