Is the knocking sound when the car is moving or sitting still as well? Does the grinding sound happen just as you put the car into reverse or does it keep grinding?
These transmissions are very problematic, especially if they are not properly maintained. The most likely candidates are a cracked flywheel or a broken drum inside the transmission. Either way, it sounds like the transmission will have to be removed to pinpoint the problem.
Testimonial: "it does it when its put into reverse only and does it while sitting still foot on brake and when it moves all the other gears are fine..shifts good"
These transmissions make a short buzzing noise when put into reverse (and sometimes going from reverse to drive). This is completely normal. The knocking noise, however, could be either engine or transmission related. Before a major overhaul is considered, check the engine and transmission mounts. Put the car in drive and reverse. While holding the brake firmly, accelerate to about half throttle and watch the engine for excessive movement. The engine will want to rock backwards in drive and forward in reverse. If the engine tries to rotate too far in either direction, suspect a bad mount. There are also mounts at both fenderwells. Excessive wear or play in these mounts could cause the engine or transmission to sag enough to rest on the crossmember or chassis. This would DEFINITELY cause some noises in gear...especially reverse.
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it does it while in reverse then it stops and works fine in drive and shifts perfectly
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