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Performance

Site Updated Oct 18th/2001

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  My Jeep's Tattoo's

Factory 4 Liter, Staright 6 Cylinder Engine Jeep 6 Cylinder MotorPower & Tourqe

 Factory 4 Liter - 6 Cylinder  Motor

TJ 4.0L Motor                                        

bulletPlenty power
bullet181 HP & 222 torque lb-ft
bulletMulti-Port electronic fuel injection
bullet5 Speed manual transmission with overdrive
bulletHydraulically assisted clutch

 

 

Transmission & Transfer Case

AX-15 - 5 Speed manual transmission

AX 15 - Five Speed (stock) Transmission

bulletMedium duty aluminum transmission
bulletManufactured by Aisin (a Japanese company)
bullet1-1/8" - 10 spline input shaft, 23 spline output shaft

NP231 Transfer Case

bulletAluminum Case
bulletAccepts 21 & 23 spline input shafts
bulletChain driven
bulletLow range = 2.72, high = 1

New Process - NP231 transfer case (comand track)

 

Gear Ratio

1st = 3.83:1

2nd = 2.33:1

3rd =  1.44:1

4th = 1:1

5th =  .79:1

Reverse = 4.22:1

 

 

Hand Throttle

Installed Rubicon Express Hand Throttle Linkage with cruise control still hooked up

 

This shot shows how I positioned my hand throttle.  You can also see where I mounted my cell phone

After a few trips on the trail & reading through many other Jeep sites web pages I decided a hand throttle was a good idea for me.  I ordered mine from Rubicon Express as everyone seems to.  One of the 4x4 magazines I read had a detailed installation featured.  I also looked at the product review by Rockcrawler which is well laid out. 

Installation:    1 Hour (it was very simple, I just couldn't decide how I wanted to mount the cable to the throttle linkage. Since I have cruise control it was a bit more complicated than normal).

Cost:    Rubicon Express Hand Throttle $ 29.95 US, $44.92 CAN.  Shipping charges from California $ 20.00 US, $30.00 CAN.  As I'm learning everything seems too expensive, but the product works well.            

 

 

Optima Blue Top Battery  

Optima Blue Top 900 MCA Marine Battery

Finished install shot of my Blue Top Optima battery

Well as usual, one thing leads to another!!  I installed my winch believing that my stock battery should be fine.  First time I needed to work my winch hard....  poor little stock battery got me through it, but barely.  The stock battery is a lead acid battery rated at 600 CCA.  As with all lead acid batteries they can only be worked so hard before their plates become damaged, causing the charge level to be lowered significantly.  I did not want to get in a situation where I would be let down by my battery in the worst of places to not be able to start you Jeep, so I did the diligent thing I got what seems to be the best single battery option I could go with... an Optima Blue Top battery.   The Blue Top is exact same as the more common Yellow Top, but it has to additional Top posts for additional accessories. 

Installation:  Straight forward, no big deal.  It fits in the factory battery tray with a little extra room for play.  I re-installed the thermal jacket that was on the stock battery, I figured it was there for a reason.

Cost:  $251.00 CAN

 

K & N Air Filter Cone

As a result of my Onboard Air system & York Compressor I had to remove my stock air filter box.  I was not unhappy with this stock set-up, in fact I liked the protection it afforded my intake.  Unfortunately or fortunately I had to upgrade to a K & N cone filter on the stock intake pipe in order to create space for my compressor.  

Installation:  Very easy, fastest & easiest of all my upgrades to date.

  1. Remove stock intake box by, removing cover, removing filter & unscrewing the screws that attach the assembly to the Jeep fender-wall.
  2. Cut the intake tube 2 inches before the accordion grooving in the tube (I did this incase I wanted to revert back at a later date, I could use a rubber coupling to re assemble).
  3. Attach the K & N cone filter Part # RE0930 to the tube & fasten clamp
  4. Finished in less than 20 minutes!

Cost:  $ 101.19 CAN

Installed K&N Air Filter

 Dana 44 Rear Axle Swap-in

As with everything in Jeep's, one thing leads to another & upgrades are expensive :(  When I bought my Jeep, I knew nothing about off-roading let alone the importance of a solid set of axles, low (numerically high) gearing and it's relation to performance, speed, crawl ratio etc.....  Unfortunately as a result I bought a Jeep with a Dana 35c rear axle.  I was unaware of the Dana 44 option and my dealer never mentioned it.  So as I began to learn more and more about Jeep's I knew that at sometime I'd be shopping for an alternative axle to get me and my jeep where I pointed it.  

I wasn't actually planning this upgrade for any specific time, especially when I actually bought it.  I knew I was often pushing the capabilities of my little Dana 35c, but I always was somewhat gentle with it.  When I stumbled across the Dana 44 was the same week I bought Kathleen an engagement ring!!!  But you gotta do what you have to do & any responsible Jeeper would not pass up a used (1998) TJ factory Dana 44 axle with Trak-loc!!  if the deal was available, would they?  I didn't think so, so I scrounged up the money I bought it.

Dana 44 as it came when I bought it

As you can see it had much to be desired in the appearance category when I first got it, however it still was only a two year old axle with all factory control arm brackets, coil perches and complete brakes with emergency cables.  It was not used much at all in it's prior life, still had original brake shoes, with NO corrosion inside the drums.  The exterior looked ruff as a result of it being stored.

To my disappointment the factory gear ratio of this axle was 3.55 (an odd ratio, leading me to believe it came from an automatic TJ ?).  I had 3.73 installed in my Jeep and was underpowered with them, so 3.55 was out of the question.  I had to do the gears!  So, if I'm going to do the gears what do I do?, do I buy a 3.73 set to match the front but still be unhappy with the performance?  Do I buy 4.10's the proper ratio for my 33" Claws, committing myself to a 33" tire??  Or do I take this re-gearing as an opportunity to re-gear & increase the size of my tires to 35"s??????  So I ordered the 35" tires immediately, sourced Precision Gear 4.56 gear sets and install kits from National 4WD and waited patiently :)

I knew I wanted lockers, the Trak-Loc that came in the axle was unfortunately unusable since it was below the break size in carriers for a Dana 44.  I believe the carrier break in a Dana 44 is 3.92, meaning all ratios below that use one size carrier, all ratios above it use a different size carrier.  I had to make a decision then, buy a carrier for the 4.56 gear set or buy lockers, at least the rear?  I was constricted by my responsibility to save some money before getting married, so the lockers have to wait until next summer :(  Oh well I was just excited to get BIGGER tires, a better axle with a BIG set of axle shafts and some real gears!  The Dana 44 axle is a very capable axle, it's ring gear is 8-1/2" in diameter with a pinion shaft diameter of 1.375" and 26 splines.  It's not unbreakable but definitely capable.

Installation:     Installing the gear set wasn't very difficult, I had the assistance of a knowledgeable mechanic (thanks Ted) and I read a lot of info prior.  Half way through the gear install we realized that the spider gears from the Trak-Loc carrier wouldn't work in an open carrier, so I had to quickly source a set!!!!!  Luckily I found a used set within a day!  The hardest part of installing the axle once painted & prep'd was physically handling the monster!  I knew going into the install that I'd have to forfeit the factory ABS braking that my Dana 35c had, but I had no affordable choice as tone rings for the Dana 44 axle shafts are difficult if not impossible to find.  All went well with the install, lining up the control arms is always a chore, re-attaching the emergency brake cable is also lots of fun, but all in all it was just a bolt in!

 

Finished install shot

Notice the rear Tera-Flex shock re-location brackets

Isn't it much nicer than the Dana 35c was??

 

Cost:  Axle was $1500.00 Canadian, the Gear sets and rear carrier were $975.00 Canadian and the unexpected spider gear set for the Dana 44 was $75.00 Canadian (used) for a grand total of $2550.00 Canadian.

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Last modified: October 20, 2001