Paul,
I think when Jeep used the Iron Duke they had a Borg Warner T-5 available.
The T-5 World Class is a pretty good transmission from what I hear. The
NV4500 is much stronger but do you really need that with the mercruiser?
You could probably pick up a jeep 4 cylinder and transmission for next to
nothing since the jeep guys ditch the 4's and drop in a 6 or 8. This all
makes me wonder, how much does a 109 weigh? If the 4 isn't good in a 3000#
jeep what good is it in a 5000# rover?
Also look at the new NV4600 I haven't seen one, but we have one in a truck
here at work. If it were the same case as the 4500 you could have 6 speeds
in a bullet proof transmission=ion with PTO drives.
Best of luck to you,
Robert
-----Original Message-----
From: Paul Schultz [mailto:pschultz@vcmails.com]
Sent: Wednesday, April 16, 2003 12:01 AM
To: lro@koan.team.net
Subject: [lro] Which transmission?
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.
The easiest option is to buy the Robert Davis conversion kit with the
adapter, engine mounts, etc. and go with the stock gearbox/TC and either
the Roverdrive or the Ashcroft Hi-speed TC. But, I don't like this as
well because while my gearbox is quiet and tight it is _old_ and parts
are only going to be more and more difficult to find in the US in the
future. Also, a lot of my money would be invested in a relatively
expensive modification to bring the overall gear ratio to an acceptable
level (Roverdrive or Ashcroft). This money could be better spent on a
new-to-me gearbox. This brings me to the other option of getting an
American gearbox and use the Rover transfer case (again with an adapter
between the two).
So, what are my choices of American gearboxes that would bolt up to the
Mercruiser/Iron Duke? Any 5 speeds that wouldn't need an overdrive?
I like the idea of spending my money on a more robust American gearbox
that would bolt up to the Mercruiser. This would make the drivetrain a
complete American set-up with easy parts and repair availability.
Finally, didn't the Chevy S-10 use the 2.5L Iron Duke? What gearbox did
the S-10 with the Iron Duke use?
My goal is to transform my 109SW into a more modern daily driver (I'm
just concentrating on the drive train in this post.I realize all the
other areas that will need updating as well).
Anyway, enough of my ramblings. I'd appreciate any advise.
Paul Schultz
Series III 109SW
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