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4 Wheel Drive/SUVs/1995 Explorer Transmission

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Expert: - 11/18/2004


Question
Transmission isnt shifting properly and O/D light is flashing.Using AutoXray tool it shows codes 646 and 647. Incorrect gear ratio for 2nd and 3rd gear.The O/D light went out after  I disconnected the battery for 10 minutes.I test drove and trans would shift at 4000 rpms into Drive only if I let up on the gas pedal.

Thank you for your time.
      Mike

Answer
MIke,

This is just a guess, but many of these transmissions are shifted electronically, and due to the mounting of the motor, and transmission they tend to have less than adequate grounding.  The first thing you should try, is to install a ground strap directly from the transmission to the frame.  Make sure that the negative terminal on the battery, also has a good ground.

Other than that, I would take the Explorer to a reputable transmission shop, and have them drive it with you, so that you can show them the problem first hand.

Carl

4 Wheel Drive/SUVs

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Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

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