i have a 2004 1/2 3500 drw cummins with the 4 speed 48-re tranns some times when i put it in reverse and give it a little throttle i get a weird clunk like sound and feel same in drive sometimes it happends sometimes it dont i drive with my hot juice around on level 1 when i wanna run it i take it to level 5 then back to 1 my attitude monitor says i get 8% slip when i mash the pedel on the highway on level 3 to get a little smoke last year i was backing a 4000 lbs boat up a steep grade and my trannsmission temp light came on then went off i tow a 13000 lbs 5ver camper sometime my truck has 32000 miles on it does this sound like my transmission is about to chit to bed thanks

 

Check your u-joint or drive shaft carrier bearing most likely source of the clunk.

 

its kinda like its slipping into gear when i put it in reverse and takes a minute to catch

 

Have you flushed out the old fluid and tried a "band adjust" yet?

 

Yeah, you probably loosened the reverse band a bit.

 

can i adjust the bands in my drive way is it some anyone can do or it something a shop has to do thanks

 

Do a search for "band adjust" or "adjusting bands" and you'll get all the specifics you need.

It is something you can do in your driveway.

You will need an INCH pound torque wrench, a torx bit (not sure which size) for one of the bands, a 1/4" socket for the other band, 2 other sockets for the lock nuts, and one socket for the pan bolts.

 

Front band adjust: 40torx, 3/4 box end wrench. I like to put a little teflon sealer on inside edge of lock nut to prevent seepage of fluid up threads.
Reverse band: 1/4" socket, 9/16 deep offset box end wrench.
specs: front band, 72 in.lb., back off two turns
reverse band: 72 in.lb., back off 3 turns.
Check fluid before doing anything else, and check in NEUTRAL.
HTH
James
DTT builder/installer
Near Dallas.