transmission questions (problems?)

[ATXDMAX]

i have a couple questions. 1. when i shift from reverse into park it makes a pretty good thunking sound (and sometimes from drive to park) and on level ground the truck rolls back an inch or two (like its spring loaded or somethin). but if i go from reverse to neutral to park it just makes a little thunk and its fine. 2. sometimes when i am coming to a stop it kinda feels like someone has rearended me. it happens right before the truck is completly stoped. its almost like its downshifting hard or somethin. i dont have the tow/haul on. if anybody could help that would be great. i just wanted to catch it before it became a bigger problem. thanks JB

[duramax-rob]

My 01 does the same thing. I'm hard of hearing and with the hearing aids, the coming to a stop to me sounds like the diesel fuel is sloshing in the tank once. Also I get the banging noise. Hope someone can help you. I have just become accustomed to the noisecause everything seems to check out ok.

[BigRedChevy]

The noises are all normal. The feeling of being rearended is probably when the t/c is unlocking so it rolls much easier.

[Hook'em_Horns!]

My '02 LLY cc DRW did the same thing. This '05 never has though, maybe something changed within the Allison or ECM between early and later versions?