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[Green Jeep]

When it is time to go into 3rd the engine revs, like a slipping clutch would do and drive is lost, put it into 2 and drive resumes.

Level was slightly low, topped up.

Knackered box or possible gearbox ECU fault?

Thanks in advance Maf

[Wildfire]

What is the mileage of the car?
Does this happen when cold or all the time?
Has the ATF in the gearbox been changed at any time? the ATF can be contaminated with metal filings through time, generally blocking the filter and upsetting the electrohydraulic unit 

I've heard of similar issues with Sprinters (they use the same NAG1 box)

Extract from their forum:-

"The service manual says (in caps is problem, 1st # is possible cause, 2nd # is solution to possible cause):

"DELAYED ENGAGEMENT, NO TRANSFER OF POWER IN R AND/OR D, ALSO AT TIMES

1. Oil Level Too Low. 1. Check Oil Level. Add if Necessary.

2. Recognition Switch - Selector Lever Position. 2. Replace Recognition Switch Only When Intermediate Position or Fault is Indicated.

3. Oil Filter Not Installed. 3. Install Oil Filter.

4. AEV, Delayed Pressure Build Up On Piston B2/B3. 4. Install New Shifting Procedure (TCM, electrohydraulic control unit or repair set).

5. Wrong Combination TCM/ Electrohydraulic Control Unit. 5. Check Combination TCM/Electrohydraulic Control Unit. Replace TCM Resp. Electrohydraulic Control Unit, if necessary."

Since oil level is very sensitive to temperature and you notice it most when cold, I suspect the oil level is low. Have you looked for signs of an oil leak?"

Good Luck

Dougie

[Jeepjedi]

Hag this with my ZJ changed the fucking gearbox and it was the Throttle position sensor, cheap part may sort ya issue

[sparky]

Had a similar problem on my WJ, whilst in D only 2 forward gears working and reverse.
Problem turned out to be faulty speed sensor on gearbox. Sensor just fits into side of gearbox
and held in place by one bolt.