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limited slip differentials are so designed that when one axle looses traction the pressure is applied through the side gears to lock up diff so that both wheels have to turn. If it slips in reverse then in will slip going forward . I would be inclined to look for a reverse gear problem in the gear box/ transmission. If it is an auto check for reverse solenoid operation.
Definitely not good. The transmission is slipping internally due to worn gears and clutch packs. It will have to come out for rebuilding, IMO. Have a transmission shop check it out.
Good luck.
Transmission model is 4L60E,and the symptoms you are describing is a common failure on these transmissions all the way back to it's predecesor,the 700 R 4 model.The reverse input shell,splines into the low/reverse planetary sun gear.The reverse input shell has a collar with splines made into it,and these splines are prone to stripping,and sometimes the collar itself will break free from the shell.Without the shell functioning,no reverse,and this is likely what you are hearing.Aftermarket companies sell heavy duty,and standard duty,replacements.Eventually,you will lose the forward gears also.Good luck.
Brake lock solenoid has failed not allowing the gear selector to move out of "Park"
Excessively low transmission fluid (note: if car is operated for an extended amount of time with low fluid level the transmission will fail prematurely)
Shorted electrical component not allowing the PCM to control the transmission. Example: shorted fuse
Flex plate (flywheel) is broken completely not transferring engine power to the transmission.
2. Car goes into gear but then fades out of gear or is slipping while driving:
Transmission fluid is low
Transmission clutch discs or bands are worn out or burned
Faulty transmission shift solenoid.
3. Car goes into gear but does not shift out of first:
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