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F.A.Q.

 

What information do I need to send in with my harness?

 WIRE HARNESS INFO PAGE

 NAME:

 ADDRESS:

 PHONE #:

 EMAIL:

 YEAR OF PROJECT VEHICLE:

 CURRENT ENGINE AND TRANS:

 YEAR AND MAKE OF DONOR:

 YEAR OF HARNESS (if different):

 YEAR AND MAKE OF PCM DONOR (if different):

 TRANSMISSION USED FOR SWAP:

 WANT A/C(circle one) - YES or NO

 TURN A/C INTO AIR COMPRESSOR - YES or NO

 DID DONOR VEHICLE HAVE SECURITY KEY - YES OR NO

 DID DONOR HAVE FACTORY ALARM - YES OR NO

 DID DONOR HAVE LEAK DETECTION PUMP - YES OR NO

 Send with harness to:

 Backwoods Offroad

202 McDonald Lane

Grants Pass, Oregon 97527

 

I STARTED BUILDING MY OWN HARNESS, CAN YOU GIVE ME ADVISE?

NO! Do to liability issues , we will no longer be giving advise to people who are building their own harness. This business is how we feed our children and we will not be responsible for someone ignoring our experience and advise resulting in them burning their Jeep down in the garage. For customers who have been loyal without being able to purchase a harness yet, we sincerely apologize. For everyone else, let us build your harness. Do not burn your garage down to save a few $$ 

HOW DO I TELL IF MY TJ  IS CCD OR PCI?

Jeep changed from CCD Buss to PCI Buss between the 2000 and 2001 model. The easy distinction between the two is the color of the needles on the instrument cluster. White needles are CCD, fluorescent orange are PCI.

1997-2000 = CCD

2001-2004 = PCI

HOW DO I TELL IF MY DONOR  IS CCD OR PCI?

All 5.2L Magnum engines are CCD. Dodge and Jeep switched from CCD to PCI in different years of each vehicle. Some vehicles have both in the same year. Dodge Ram had CCD and PCI in the same year.

-Durango 1998-2000 = CCD, 2001-2003 = PCI

-Grand Cherokee 1996-2000 = CCD, 2001-2003 = PCI

-Dakota 1997-2000 = CCD, 2001-2003 = PCI

-Ram 1998-2001 = CCD,

2002 (Ram 1500) = PCI

2002 (Ram 2500 light duty Vin Z)=CCD

2002 (Ram 2500HD) =PCI

NOTE* 1996-1997 Ram is neither CCD nor PCI and will not operate gauges in TJ

WHAT IS THE DIFFERENCE BETWEEN CCD AND PCI BUSS?

Both are how the computer communicates with the instrument cluster in your TJ. CCD uses 2 wires, a positive and negative to send data on using electrical pulses. Much like Morse Code. PCI uses 1 wire and sends data simultaneously in both directions. These two systems while similar are not compatible. If you put a PCI Buss PCM in your CCD TJ, it may start but you won't get any gauges and it will set several codes causing the vehicle to run in LIMP mode. The opposite also applies.

HOW CAN I TELL IF MY VEHICLE OR DONOR IS OBD-II OR OBD-II?

Check our article HERE.

 

WHAT'S BETTER, 5.2 OR 5.9 MAGNUM?

This is a question we get asked a lot. We prefer the 5.2L if running medium duty axles like 8.8 Ford or Rubicon, 35 inch or smaller tires and any time MPG is a factor. The 5.2L will typically get a few MPG better than a 5.9L with these conditions. If you are running Dana 60's, rockwell's, or other heavy duty axles, tires larger than 35 inches. Than we would recommend the 5.9L. However the 5.9L has a few design "flaws" in that it has a smaller cam and intake valve size than the 5.2L, requiring either 5.2L cam and heads or our EQ heads and heavy metal cam to bring the 5.9L to its true potential.

Due to the 5.2L internal balancing, it can rev quicker. Which can be helpful in the mud and sand.

WILL I HAVE TO CHANGE OR MODIFY MY DRIVELINES?

Depending on how you do the swap, you may have to shorten the front 2 inches and lengthen the rear 2 inches. This method uses a mechanical fan from a Dakota or Grand Cherokee and a 4.0L shroud. It moves the engine forward which also allows use of factory "log" exhaust manifolds. This does cause minor issues with transfer case shifters as well as transmission shifter location in 5 speed swaps.

We prefer the Backwoods Offroad method of doing the swap. This entails the use of our custom made headers and an electric fan. In doing so you will need to modify the passenger side engine mount by drilling a new hole. This much prefered method of doing the swap, not only keeps the transfer case within 1/2-3/4 inch of stock location, facilitating the use of your stock or custom drivelines but also moves the engine's center of gravity 1/5-2 inches rearward. This equates to less front end sag much like a heavy bumper and winch combo.

WILL MY TRANSFER CASE BOLT RIGHT UP?

That depends, there are 3 transfer case input shafts. All 4 cylinder Jeeps have a 21 spline input which will not work. 6 cylinder TJ's have either a 23 spline short or 23 spline long input. All donor transmissions are 23 spline output, most automatics use the short input and most manuals use the long with exception to the NV3550. You can shorten a long shaft fairly easily by removing .97 inches off the shaft. It is also fairly easy to use donor transfer case if it's a 231. We have heard reports of people using the input shaft of other transfer cases as well.

WILL MY JEEP FUEL PUMP WORK ON A V8?

Your Jeep fuel pump, whether 4 or 6 cylinder is the exact same pump as the v8 donor's pump, just a different pickup assembly.

DO I HAVE TO HAVE YOUR HEADERS IF I WANT TO KEEP MY DRIVELINES?

No, while we do believe that our headers make the swap easier and cleaner looking, you may use factory manifold off of a Grand Cherokee as they exit straight down between the 3rd and 4th cylinders back on each side. Ram, Dakota, and Durango manifolds all exit at a 45 degree angle behind number 4 cylinder causing major body interference.

WHAT IS A LEAK DETECTION PUMP?

A leak detection pump is a small vacuum pump that is connected to the emissions system and charcoal canister on later model TJs and donors. The original system used engine vacuum to test the gas cap and fuel system for vapor leaks. The later models with leak detection pump test the system prior to starting the engine prior to starting the engine when you turn the key on, either system affects performance in any way. To determine if either TJ or donor has LDP, look at the charcoal canister, if it has one ¾ inch hose, one ⅛ inch vacuum and a mushroom shaped vent cap then there is no LDP. If the charcoal canister has two ¾ inch hoses and one ⅛ inch vacuum line it does have an LDP. Follow middle large hose to LDP which is a 6 inch by 2.5 inch black plastic part that will have a 3 wire plug exiting the pump.

DO I HAVE SECURITY KEY(SKiM) ON MY JEEP OR DONOR?

SKiM, otherwise known as Security Key Interlock Module, is an anti-theft device installed on many later model TJs as well as Grand Cherokees and Durangos. SKiM works by having a small microprocessor built into the key FOB that sends a coded signal to the antenna located around the ignition switch. If you try to start without the PCM receiving the correct code, the vehicle will start and die or not start at all. The system  can be bypassed on the donor by using a PCM that does not have SKiM. Both Dakotas and Rams are excellent choices for a non SKiM PCM as only Dakota R/T’s have SKiM and special order Ram’s/ If your TJ has SKiM then you will need to either permanently disable it or have your local Dodge/Jeep dealer flash your SKiM code to the new donor V8 PCM

The easy way to tell is to look at the ignition key. If the key is plain metal, or has a black plastic key FOB it does not have a SKiM system. All vehicles with SKiM have a gray plastic key FOB

SHOULD I RUN A MECHANICAL OR ELECTRIC FAN?

We are big fans (pun intended) of the flex-a-lite Black Magic 180 fan. Many of you may already have this fan installed on your 4 or 6 cylinder Jeep. We feel that it cools better, is quieter and more easily adapted to the swap than any other electric fan. It is the only fan we have used and never had an overheating problem. The mechanical fan will work but does require driveline modifications and tends to allow overheating when crawling as slow speeds without much air movement.

WHAT GETS THE BEST MPG?

Simple answer, the 5.2L with a 5 speed manual transmission. We have had several 5.2L 5-speed Jeeps in the shop that had 31-33 inch tires and 4.10 gears that were able to achieve 20 MPG hwy and 18 MPG city. The red TJ on our site drove from Sparks, NV to Medford, OR, over 400 miles on one tank of fuel, this was a confirmed 22 MPG. That TJ has 31 x 10.50 tires, 4.10 gears and 1.5 inch spacer lift. Typical MPG from our Yellow TJ, which has a 300 hp 5.2L automatic, 35 inch tires, 4 inch lift, 4.88 gears and my size 12 Danners is 16 MPG hwy, 14 MPG city and 14 MPG towing a 2000 pound boat! And yes, you can tow with a V8 Jeep

WILL A 1993-1995 GRAND CHEROKEE WORK AS A DONOR FOR A TJ?

Typically our answer is NO. See previous OBD-I, OBD-II question. However if you happen to find one with super low miles for super cheap you can use the long block and 44RH transmission. This will require getting a OBD-II intake manifold, sensors, distributor, PCM, and harness. You will have to run a manual transmission PCM as the automatic transmission PCM will not communicate with the 44RH transmission.

 WHATS THE BEST YEAR DONOR FOR A YJ?

The best year for a YJ donor is a 1993-1995 as it is OBD-I just like your YJ. The fuel system is also a return line system unlike OBD-II vehicles which are a single line system with the fuel regulator mounted on the pump.

WHAT YEAR AND MODEL DONOR SHOULD I GET?

We typically recommend getting the same year as your Jeep or as close to it as you can. Things to consider are picking a donor that is not older than your Jeep as this is a federal smog law violation. Factors to consider are CCD/PCI, pre-heater O2 sensor relay circuitry, fuel system compatibility.

CAN I DELETE THE EMISSIONS ON MY JEEP?

You can but there is no reason to as it does not affect horsepower in any way, it helps keep the inside of your engine cleaner and saves you money from an expensive computer flash to remove it. Not to mention it makes the world a cleaner place to wheel and keep tree huggers off our backs.

DO I NEED TO HAVE 2 OXYGEN SENSORS?

All OBD-II systems have at least two O2 sensors, a pre cat and a post cat. The PCM checks O2 voltage and adjusts fuel ratio based on the rear or post cat sensor reading a higher voltage as the catalytic converter scrubs any unburned fuel from the exhaust. This is how the computer tries to achieve a perfect 14.7 air to fuel ratio which is where the most power is achieved. Also, this will produce the best possible MPG. It is a common myth that removing the catalytic converter on a fuel injected vehicle will result in more power assuming the cat is in good working order and not plugged or broken.

DO I NEED A CATALYTIC CONVERTER?

All modern fuel injected vehicles use a catalytic converter to keep emissions at acceptable levels. Your PCM has been programmed to work in conjunction with a cat to provide the perfect 14.7 air to fuel ratio. Removing the cat will actually cause a loss in power and an overly rich condition, this will reduce your overall MPG and make your Jeep run poorly with a check engine light and limp mode.

MY JEEP HAD A/C. CAN I STILL HAVE A/C?

 Yes, you will have to have custom lines made and use the dakota drier. Any hose place can make you new hoses. We can also wire your harness to use your A/C pump as an air pump.

MY JEEP HAS CRUISE CONTROL. WILL IT WORK?

 Yes, if your Jeep has cruise control it will work.

DO I HAVE TO FLASH MY VIN IN THE DONOR COMPUTER?

NO, your Jeep will run just fine without the VIN being flashed. NOTE** We have heard unconfirmed stories of California requiring the VIN to be flashed into the PCM.

Do I have a 44/46RE or RH

Click HERE to read our article conserning trans identification.