SSM III-IIIA
#2
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Join Date: Jan 2001
Location: ST. Louis, MO, USA
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IIIAs have the larger 26 spline prop shaft. Uses the same props as SSM V and VI. IIIs have the smaller 19 spline 1 3/8" shaft.
There are also some differences in the gimbals in the later IIIAs to make them stronger.
Gary
There are also some differences in the gimbals in the later IIIAs to make them stronger.
Gary
#4
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You can't tell by just the prop shaft, as it is possible to put the shaft from a big shaft #4 in a 3.
Take a look at the tilt pin hole, a 3 is 3/4, a 3A is 1". Of course it is possible to drill that out too.
Take a look at the tilt pin hole, a 3 is 3/4, a 3A is 1". Of course it is possible to drill that out too.
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Marc
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Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
#8
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Ike, no way to convert. A 4 upper is a different housing. A 3 and 3A have different vertical shafts in the lower.
We us the good old Merc HP gear lube.
We us the good old Merc HP gear lube.
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Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
Marc
www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired
#9
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What are the differences between a 3a and a 5 other than length?
I've got 5's on a boatwith stellings boxes we're riggin and we're just now dialin in the props. Maybe a cupped prop will help us get on plane faster.
Its a 38 that weighs 7800lbs. The drives are right below the transom, We're gonna try some cupped props next week to get that thing to plane off.
I've got 5's on a boatwith stellings boxes we're riggin and we're just now dialin in the props. Maybe a cupped prop will help us get on plane faster.
Its a 38 that weighs 7800lbs. The drives are right below the transom, We're gonna try some cupped props next week to get that thing to plane off.
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Michael1
Drives and Lower Units
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07-06-2007 09:16 PM