> I'm planning on converting my 109SW to a Mercruiser 3.0L engine. I have
> a lot of ideas and questions and want to bounce them off the LRO list:
> Where I need some help is in deciding what to do with the
> gearbox/transfer case.
Well you are starting with a GM power plant. How about a close ratio
NP435? Chances are you will be able to find an off the shelf bell
housing & clutch assembly that will be available in any auto parts
store. It is a robust gearbox with parts available throughout North
America and every transmission shop has someone with lots of rebuilding
experience. BCB Offroad makes an adaptor to bolt it to a series
transfer case. Add an Ashcroft kit or Roverdrive, 32 to 34 inch dia
wheels and you should have nice highway and off road gearing. I ran
the numbers on the close ratio NP435 and with the stock diff & 32 inch
tyres low first provides a sweet off road ratio that would be close to
perfect on a series rig for most common obsticals. Stock series IIA
first gear is 3.60:1, close ratio NP435 first gear is 4.78:1.
> Any 5 speeds that wouldn't need an overdrive?
The SM4500 is your best choice if you have a 109 but is real long for
an 88. You would need to make frame modifications to fit it & the
special oil seems to cost its weight in gold. But it is a good box and
has that nice overdrive fifth gear. The Roverdrive or Ashcroft kit
would be way cheaper when all is said and done.
TeriAnn J. Wakeman
Marigold Ltd.
www.marigoldltd.com
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