1998 megane 1600 auto box

Reverse clutches gone rear hub Asembly in back of trans also u should have no low gear or weak on probably don't take off forward like it use to

I understand you mean it lacks power on takeoff? Is it an auto? If so look for a trouble code, which may indicate a failed shift solenoid, which stops the trans from finding low gear.

It may also be

- slipping clutch if a manual
- low auto trans fluid
- faulty fuel pressure relief valve (stuck open)
- fouled and worn spark plugs
- vacuum leak in the intake hoses
- faulty emissions system (dirty PCV or EGR valve)
- cracked ignition leads or cracked distributor cap

First thing, try to extract a trouble code. Autozone will do this for you.
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it looks like an interior light or if fitted an undef bonnet light check to see what lights are not working and check for earth if not reply an i can investigate if you have more info,just a thought its not a LPG conversion is it ?

sound like you may have a lifter pecking put ear near valve cover and see if noise is more noticeable

it is a difficult conversion, aside from the fact you will need all the hardware changes, the ECM will not work, and many of the harnesses thorughout the vehicle would have to be replaced.

You must have a 3.0L engine to have a 670T 3 spd trans, if so, with high mileage trans, the diff bearings will start to wear out under torque and send fillings into the governor mounted on the tranfer shaft, giving you all kinds of shifting problems, also worn front clutch disc pack and seals will do it, also total failure of the front clutch will give you no reverse, 3rd gear needs front and rear clutch to work together,pull the pan off and check for fillings and material, if lots , pull the trans for overhaul. need more info, just ask RDJRP.

It would be cheaper to sell your auto and buy a manual. Besides the cost to buy the standard trans, flywheel and clutch you would have to purchase the linkage system for both the shifter and the clutch. It is not hard to go to an auto from a standard, but it is extremely hard to go from an auto to standard. I don't recommend the conversion unless you have lots of money, time and skill.

This comes from a former owner of trans shop of thirty years.

More work than it's worth,You would have to change the PCM, wire harnesses, maybe driveshafts, trans mounts. Would have to add a shifter console, because the car was never built with one. Somehow figure out the clutch pedal and clutch master cylinder, and who knows what else. I believe it would be a difficult task. Good luck, Honda Al

It would be cheaper to fix the automatic

u will find it hard to buy a used auto box to fit this car, and remember u will have to change the gearbox mounts fit a different pedal box and modify where the gear selector mounts for a manual gearbox conversion. to much hassle for such little gain better off buying another car