transmission

[missjean]

hi my sons commy has a trans issue. auto trans, it has reverse, it will go into drive with a slight clunk but wont move, so have to drive it manualy, 1st gear was ok but now when taking off very very sluggish reves alittle before it wil move into 2nd, 2nd to 3rd is ok just slow to change then when shifting to d nothing, at the moment hes using 2nd gear to take off but depending on revs it will shudder and make a slight moaning kinda noise, he thinks its the diff thats making it like this, ( the rear diff iis **** its not a locked diff)

 

[missjean]

hi my sons commy has a trans issue. auto trans, it has reverse, it will go into drive with a slight clunk but wont move, so have to drive it manualy, 1st gear was ok but now when taking off very very sluggish reves alittle before it wil move into 2nd, 2nd to 3rd is ok just slow to change then when shifting to d nothing, at the moment hes using 2nd gear to take off but depending on revs it will shudder and make a slight moaning kinda noise, he thinks its the diff thats making it like this, ( the rear diff iis **** its not a locked diff) basicly drive is out as well as 1st gear

 

[bluehighway]

Diffs make a heck of a noise when they are stuffed and you dont really get to go anywhere with a blown diff...likely the trans has problems...all you can do is check fluid levels ...have a look at fluid see if its burnt (black or very dark) if it is theres problems... If its low top it up and see if it improves situation (not likely to improve situation if fluid is very dark)...whatever you do do not overfill the trans...(overfilling is worst than underfilling)... take car to a transmission expert and get an opinion...

 

[Immortality]

Check/change the transmission fluid for starters.

 

[BlackVXGTS]

From 4L60e common problems, see if any match your situation:

17. No forward movement in OD or D, but L2, L1 and R work: Forward sprag is broken. R&R. Try not to run or drive the car or further damage could result.

24. Car feels sluggish off the line, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmission is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the under hood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.

R&R = Remove & Repair (or Rebuild) = Transmission must be removed to fix the problem and may have to be rebuilt or replaced.