Will only select 3rd & 4th

Question edited with a GUESS at the make and model.
Question moved to the guessed make and model category.
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You need a good man with a scan tool. Transmission Position Sensor is my guess. It is a known issue.

https://www.google.com/search?q=2002+Golf+not+engaging+3rd+and+4th+gear

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Sounds like one of the rods between the gear lever and gearbox has become detached. One rod transmits the forward-backward motion, the other left - right, with the "natural" bias keeping the lever in the 3rd / 4th gear plane - hence why you've only got 3rd and 4th gear.

You should have some guarantee from the company that fitted the clutch so contact them to sort it out.

check the pivot for the lever in the turret at the top of the box
3rd and 4th gear is the same selector rail so the end of the lever may be out of the selectors

Worn bushings, bent shift lever, Broken engine mount is a possibility

Snap! The gearbox on my 2000 Alhambra just gave up today too!. I can only get 3rd & 4th gears. It's done 102,000 miles. I'll keep looking for advice, and post another bulleting here if I find anything out.

try this.you have 2 shifter cables.one is select cable the other is shift cable.first put the transmission selector lever in neutral.then move transmission shift lever to 4th gear.depress clutch to if necessary to shift.move the shift lever to the 4th gear position until contacts stop.then you turn the adjuster turn buckle so the shift cable eye aligns with the eye in the gear shift lever.when installing the cable eye. make sure the flange side of plastic bushing at the shift cable end is on the cotter pin side.the cables should be adjusted so the clearance between the shift lever and both stoppers are equal when the shift lever is moved to 3rd and 4th gear. move the shift lever to each position and check that the shifting is smooth.

Check the operation/adjustment of the 5th/Rev gear gate and associated selection levers.
Check 5/R gear lever linkages are operating correctly.

wear and tear

definitely something in the tranny

dis canekt the batrey 4 10mins and than leter it till it gows up a ger and chek the oil in it