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Problem turned out to be a defective vacuum solenoid. There are 2 solenoids mounted a common bracket on the firewall to the left of the power distribution area and right behind the battery. The right solenoid (E8AE-9H465-AA) controls the vacuum to the return side of axle engagement diaphram...

Thanks Driller ... I'll try that tomorrow. It could be that the solenoid is stuck always open. I did not check to see if it switches vacuum on & off with 12 volts applied and disconnected directly.

Yeah .... I had already planned that was my fall-back solution once the snow comes. Yes, the 98 does have the same transfer case clutch set up for A4WD so that the 4X4 is switched in as needed. The downside is that I will loose gas mileage with axles engaged all the time. Too bad they...

Hi Guys Any suggestions for my 98 Navigator that will not engage the front axle for 4 wheel drive in either A4WD, 4X4 or Low Range ? The diaphram unit on the front axle works fine. If you connect vacuum to either side of the diaphram it will engage or disengage the the 4 front axle correctly...

NAVI Air Ride Compressor problem solved NAVI Air Ride Compressor problem solved Turned out be the relay. All 4 pins were shorted together, so not only did it feed 12V to the compressor constantly, it also fed 12V back to the control circuit. The reason the compressor eventually shut off was...

The height was OK front and rear. The compressor just ran constantly. I parked it a couple days ago and all was fine. Came out this morning and the battery was dead. Jumped it to start. That's when I found the compressor ran constantly. Let it run while I put up this posting this morning...

1998 Navigator 4X4 82,000 miles Anyone have any thoughts on what might cause the air ride comressor to run constantly even with ignition key off and locked ?

Anyone have any suggestions for a shift kit and other mods (similar to Jerry Mods) for the Navigator transmission ? Can you use Mercon V or should I stick with Mercon III ? How do you tell the difference between the 4R100 and E4OD models ? Any suggestions for cold air / intake mods ? How...

I'm not familiar with SCT, so I'm not sure who Dave is either. Can you provide me a little guidance here ? Website link, email, phone, etc. Thanks

Anyone know if it is possible to send an inquiry directly to Jerry ? Does anyone have an email address, snail mail address or phone number ? Bill

Anyone know if Jerry has ever published mod procedures for the Navigator or F series truck tranny ? If so, where might I find them ? Bill

Hey guys .... any thoughts ????? When the air temp is below 32 degrees my Gen2 is very hard to start. Crank, crank, crank all it does is stumble like it's firing on just a couple cylinders. If you hold it to the floor it will finally start, but will not idle till it warms up for 5 minutes or...

Hi Dave If you change the Output Shaft Speed Sensor (OSS) gear, commonly referred to as the speedo gear, you will correct your problem of the tranny shifting at 5,000 rpm. On Gen2 cars the speedometer gets its input from the left front ABS sensor. The OSS feeds the Powertrain Control Module...

The speedometer on Gen2 cars gets its input from the left front ABS sensor. Consequently, changing the rear end gear ratio does not effect the speedometer reading. You will, however, still need to change what is commonly called the speedo gear on the transmission output shaft sensor. This...

Hey Guys Anyone else seen this or am I the only victim ???? My rev limiter does not cut in when I shift manually. (found out on a manual downshift that pegged the tach) Works fine when letting the tranny shift itself, but will rev right up to 7000 (and beyond I assume) in first, second and...

Failure to change the OSS (output Shaft Speed Sensor) gear, commonly referred to as the speedo gear, will cause your tranny to shift at around 5200 rpm with 3.73's and even lower with 4.10's. On Gen1 cars this will also affect the speedometer reading. On Gen2 cars the speedometer gets its...

With the Jerry Mod, it's all a matter of how far you want put your foot into it ! Light throttle = light shift .... much the same as stock Heavy Throttle = make sure your headrest is in position or you're going to end up with whiplash !

Thanks guys, for the kind words ! Email me direct if you have specific questions. Keep in mind that I have a Gen2. I'm about to rework a stock 97 Cobra. If I get some pictures of the port work (before and after) can someone post them ?

In practice I think you will find it to be lot cheaper just to buy everything you need from FiveStar Ford and do the 300 -450 HP Jerry Mod. Here are the prices for a Gen2: XW7Z-7D100-AA Separator Plate Gasket $1.46 1L3Z-7C155-AA Separator Plate Gasket $1.78 F7aZ-7F251-AA 1/2 Accumulator...

I made the swap about 2 months ago. Went pretty much as expected, given the extensive rearch that I did prior to digging in. Dan Rotolante and Robman2 provided some great step by step procedures and Max at Five Star Ford provided an assembly drawing which really prepped me for what I was...