Power Train Driveline problems of the 2004 GMC Sierra 2500

Allison transmission housing failed at 54,000 miles. Gm paid parts, I paid 1,200. 00 labor , was told that there was 2 bulletins out on defective housing and when they finished repair they said they installed updated housing so I would not have problem again. Don't think I should have paid anything to have it repaired! at 105,000 miles transfer case failed , cost 1,150. 00 to repair, have had to take back 2 more times as repair was not done right. At 112. 000 miles speedometer became erratic was told it was a common problem ,and see on complaint search it is , consider this a great safety danger as I do not know what speed I'm going can only guess not fixed yet found some who sells rebuilt ones foe 150. 00 ,said their rebuilding them due the large number that are failing. Also at 112,000 miles park neutral switch started acting up ,check engine light on ,shift bar light goes away, truck won't shift properly and stay in certain gears without shifting up ,effects door locks. Looked up park neutral shift as part and came across bulletins stating that during left hand turn front tire sprays water onto park neutral ,switch causing problem ,needs front & rear shield installed to solve problem. Have taken truck back in waiting for information. Also around 90,000 miles had very hard time starting truck and truck ran poorly,problem became worse took in, fuel injectors were bad and were replaced under warranty at 112,000 miles no need to say I'm not a GMC fan anymore , even though I live in lansing mi ( a gm town)and have lots of friends and family employed there. Good by GMC! never again.