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02-02-2006
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Head Honcho
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Join Date: Jul 2002
Location: Australia
Posts: 12,766 What Jeep do I drive?: XJ
Likes: 1,060
Liked 1,177 Times in 710 Posts
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Re-Gearing
Well currently the CJ7 has a mild setup. By mild I mean its not working well.
The motor pumps out into a Ford C6 auto box, with reduction being done by a NP205 case. The diffs are running 4.56 ratios as I didnt want to lose to much meat off the D44 crown wheel. All this adds up to a final ratio around the 21.99:1 which is crap by anyones terms.
So the new idea. Simple is buy a Atlas or Klune but very costly and wheres the fun in that.
Heres my theory, make a doubler. Get my hands on a NP203 box, split out the range selector section, grab a Stazworks adapter and in theory presto I have a 4:1 reduction with final output up to 44.87:1
So now to find a Np203.......
__________________
www.ausjeepoffroad.com
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03-02-2006
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Yeah I bought another one
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Join Date: Oct 2002
Location: WWW Wheeling
Posts: 4,712 What Jeep do I drive?: XJ
Likes: 53
Liked 93 Times in 58 Posts
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What does a NP203 come in?
__________________
1x CJ8
1x MJ
1x XJ
1x Jeep trailers.
1x Empty Wallet.
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03-02-2006
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RealJeepsdon'thavedoors
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Join Date: Jul 2003
Location: Brisbane
Age: 58
Posts: 471
Likes: 1
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Hey Jimmy, may sound silly but how about making your own transfer case, I thought about when I was off road racing, you don't need high range? don't need to disengage 4wd? then something like a chain driven single speed transfercase would be fairly simple to make, know anyone with a lathe?
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Glenn
74 CJ5
95 XJ Cherokee
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03-02-2006
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Lowranger Shocker
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Join Date: Oct 2003
Location: Hobart TAS
Age: 62
Posts: 1,679 What Jeep do I drive?: CJ
Likes: 41
Liked 133 Times in 100 Posts
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What kind of effect does the auto have on your overall ratio?
reason I ask, my manual tranny jeep has o/all in the vicinity of 80:1 (can't remember exact figures) and the 40 odd you mention still seems high.
pardon me if this is a dumb question to the enlightened, but I've never had an auto
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Not another V8!
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03-02-2006
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Head Honcho
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Join Date: Jul 2002
Location: Australia
Posts: 12,766 What Jeep do I drive?: XJ
Likes: 1,060
Liked 1,177 Times in 710 Posts
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The theory is that a auto will double it, which is why my original 22:1 I thought wouldnt have been a prob.
No idea yet what a NP203 came in......
__________________
www.ausjeepoffroad.com
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03-02-2006
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Lowranger Shocker
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Join Date: Oct 2003
Location: Hobart TAS
Age: 62
Posts: 1,679 What Jeep do I drive?: CJ
Likes: 41
Liked 133 Times in 100 Posts
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Ok so with the doubler and auto you should achieve 88:1
is this even low enough?
I assume the auto is "slipping" or shearing the oil to achieve the reduction
does it get hot! and what do you do to combat this
__________________
Not another V8!
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03-02-2006
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Established Member
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Join Date: Jul 2005
Location: isle of man british isles
Posts: 111
Likes: 0
Liked 0 Times in 0 Posts
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have you considered a flipped dana300?
peter henry
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