Jeep 2004 cherokee transmission sudden jolt - 2004 Jeep Grand Cherokee

Automatic Transmission,45RFE......AP4
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Automatic Transmission,42RE......AP4
Synthetic Multi-Vehicle Automatic Transmission Fluid (ATFQT)
Differential, Rear W/ Vari-Lok......GL-5

Transmission needs to have filter & fluid service, at that time the bands need to be adjusted to Spec. good luck.

its only the transmision taking up the slack of the fluid drive.a tip is to allways have your foot hard on the brake when changing into gear(safety factor) now if it were a limo, that would not be right......

sounds like a possible shift solenoid. If it's due for a fluid change, do that and add a container of lucas trans conditioner. Likely you have a drain plug on the pan so if the fluid was recently serviced, just drain a quart out and replace with the additive, then top off.
If the condition does not change within a week, likely you will need better diagnosis from a reputable trans shop.

The only one way to knowed this is reading your Repair Manual: Jeep 1999-2004 WJ Grand Cherokee Service Manual (spanish)

Also here can find the Jeep WJ 2004 - Grand Cherokee Owners Manual (english)

Hope this helped.

The sensor is not as costly. However a transmission service may need to be performed.

Last time I checked a jolt wasn't a factory option...Last time I felt a jolt, I'd broken a spider gear in the differential! That dosen't mean that that's what you have...There are numerous reasons for that and if you hear or feel anything unusual I'd have it re-checked immediately. A single jolt with no other symptoms is very hard to track down or diagnose if it left no other "footprints" behind.
It wouldn't hurt to have the shop that did the work at least give it a once over.

If engine sounds okay, (when you accelerate, it revs up, etc.) then could be a transmission problem. (assume this is an automatic?)

Check fluid level first, if okay, next suggestion would be to change fluid & filter.

When you select a gear, do you get anything, any slight jolt to the vehicle?

If nothing at all, also might check the transmission lever linkage.

Is this 4WD or 2WD? If 4WD, also need to check transfer case setting, make sure it is properly set.

Sounds like the transmission is slipping. Check the transmission fluid level and top off as needed. If the problem is not severe, an additive such as Lucas transmission additive may help.

replace the blower resistor