Forward and reverse gears will not engage (engine running ok) 2002

the drive shaft just drives a pinion gear in the prop box that drives to gears that spin in opposite directions all the time
by selecting forward with the selector rod , a dog gear is moved forward to mesh with one gear that is turning or moves the other way to engage the other gear that is turning
that is the forward or reverse action for the prop
if you have forward but no reverse the it is not a drive shaft problem but a selector rod adjustment that is not moving the dog far enough to engage the running gear

It's inside the transmission. The shift yoke probably has worn so much that it no longer moves the gear inside.

engine starts with no problem; but, when I put in gear and ...

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CarGurusNov 15, 2012 - The engine just fall dead when you step on the gas; it seems to jerk before ... My car does the same thing but i put it in neutral n it starts up. ... I have a 2004 kia optima it jerks when I go into reverse it was driving ... start and run fine butwhen I put it in drive or any other gear it dies! ... 2002 Hyundai Elantra GT.

Engine stalls when tranny put in Drive or Reverse - Kia Forum

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Common problem probably a 4L60E transmission The low and reverse clutches are the same ones The forward clutches are another set and then there are the 3-4 clutches in another pack. So you probably burn out the forward clutches or could be a stuck valve in the valve body. Time for a transmission specialist.

it overflowes when not running exchange gear box

Check the oil trans filter. Could either be a bad linkage, or a bum synchro. Does it just flat not go into gear, or does it grind when you try to do it? Can you put it in reverse with the engine off?

I dont know exactly witch is you tranny; it sound like you broke the sun shell in the transmission.

For example, this is pretty common with the Chevvorlet 4l60e Transmission, when the sun shell breaks you will lose reverse and fourth gear, the only remedy is to replace the transmssion or have it repaired; the repair will require the transmission be removed and disassembled, you will need to purchase a new sun shell (get a heavy duty replacement) and a papper rubber kit for the repair, just find a good trans guy to provide the labor.

Hope this help.

Sad to say but your automatic transmission has bit the dust.

It appears you have a Forward Clutch FAILURE. Replace the trans after you get it diagnosed and verified by a professional technician. By the way, do you have a Check Engine light? If so, what is the diagnostic code? The dealership can scan the system and find any codes which may have been stored in the TCM (Transmission Control Module). If there were any 'Incorrect Gear Ratio" codes, it's most probably the trans itself.

Check for trans codes then I would suggest a fluid change if there are no trouble codes, many times these kinds of problems are caused by a little piece of dirt causing a shift solenoid to stick.