I have a 2005 Pontiac Bonneville GXP the car shifts pretty hard from 1st gear to 2nd gear feels like a huge ****. Going from 2nd gear to 3rd gear the jerking is there but not as noticable as 1st to 2n

SOURCE: 1989 pontiac bonneville transmission will not go into 3rd or OD

the kick down cable could me off but more than likly the trans in shot/ no good

SOURCE: 2005 Pontiac Vibe having trouble shifting 1st 2nd code P2716 MIL

This is most likely due to a bad solenoid pack in transmission. You could have tranny serviced and see if it helps. Poor fluid condition makes valves stick in those.

SOURCE: 2002 Grand Am GT transmission problem.

Well, there could be several possible problems. It is not uncommon to have a little harder shifting after a fluid change for a period if the system was low prior to the change however, If you had the fluid changed using one of those reverse flush machines I see the problem getting worse. Most stations want to use the back flush system to do a fluid change now days. That is because the newer model vehicle have a metal filter screen which is re-usable and is designed at the factory to use Synthetic Fluid. In the older model vehicles, 2000 to 2005, manufacturers where still mixing the types of filters that were being used. This model has a standard filter that model uses the newer filter. If you went to Jiffy Lube and didn't specify you wanted a regular Fluid and Filter change they hooked it to the machine and charged $140+ for the job. A regular Filter and fluid change with regular fluid would have run about $50. Every time, and I mean Every time, I have had a fluid change using that back flush machine on a vehicle within 6 months I have had to have the Transmission repaired at a shop. If you didn't have the fluid changed using that backflush machine then your problem is just adjustment to the new fluid being at the proper level. If you did, start saving for a Transmission rebuild at a shop, it's not far away.

SOURCE: 2003 pontiac grand prix 3.8...the

If you have an Automatic transmission, you are out of transmission fluid. Check the fluid by viewing the dipstick nearest the engine firewall, and if it is low, add one quart at a time. Do not overfill, or you will blow a gasket and have a bigger problem. You may also need to replace your transmission, if problem reoccurs. To see if your transmission is leaking, park for about an hour, on any flat concrete surface and look for red fluid spills.

SOURCE: what causes my 2003 pontiac

Honestly, it sounds like your transmission is starting to go bad, With the cars I have had that hesitate to switch gears, the transmission went out soon afterwards. Have you made sure to check the fluid levels?

Also, check the level and color of the transmission fluid. It should be red/pink in color without much discoloration in it. And the level should be at the designated line on the dipstick.