When I switch gear in reverse my car won't move why?

If the transmission was rebuilt 2 years ago the fluid and filter did not need to be changed. In a 1981 there are no trouble codes to retrieve so whoever suggested that is out to lunch, Unfortunatley you need to get the transmission rebuilt again, hopefully it gets done better this time. Using the dexron oil in Ford transmissions is something transmission shops do because they don't want to stock different fluids. While it's not likely that using dexron oil lead to the failure it would be better to use mercon or type F oil.

Clogged transmission coolant line. Use air to blow out and replace filters and fluid.

I think your going to pull that trans again
& go thru it once more

Wasn't built correctly

check transmission fluid levelif you see metal shaving in oil pan time for rebuilt if you see more than a table spoon full of shavings but i would change transmission fluid and filter.if engine running higher rpm on acceleration transmission is slipping.

Maybe your differential is shot and will only allow reverse spin or the transmission was not really rebuilt professionally. Was the transmission checked outside of your car after rebuild? Does your vehicle have a Powertrain Control Module (PCM)? Maybe the module went bad or faulty.

code p 0442 is the code for faults concerning the EVAP system
and will not show up in transmission changing gears
indications from your statement is problems in the TR sensor, VSS or TCM units
check for problem wires and connections
as for the problem of getting to park from reverse , check the adjustment of the park and neutral switch as one may have moved or be loose

You have a failed automatic transmission. You will need to remove and replace it or have it rebuilt.

sounds like when you got it stuck you tryed to get it out and got the clutches hot and they stuck / welded when you put it in revurse does it pul the engine speed down like it is in gear but you give it gas and wont move trying to go forward and back at the same time sounds like trans rebuld time

you will need the transmission rebuilt or replaced. make sure it is someone compentant with renaults.

i had to put a new trans in my 2000 jimmy about a year ago there is something inside called a "reverse hub" its made from aluminum and not very hard to break..when mine broke i was stuck trying to move in reverse and it heard a pop then a winding down noise and sure enough its the reverse hub to fix it i just had the trans rebuilt