Got transmission seal replaced as soon as i left to drive down road went to apply brakes to stop at redlight ,and it jerked hard in like 20 mph to stop but runs great driving it down road afterwards just when u get to 20mph it does it . its a 2002 dodge neon automatic 4c please help on advice

have transmission checked

When you say it "jerks," this description could fit several actual symptoms. If by "jerks" you mean the engine misfires, it could be caused by the need for a major tune-up (including plug wires and distributor cap), or it could be a problem with fuel delivery, contaminated fuel, or defective components in the fuel system.
I assume the CHECK ENGINE light is on (and has probably been illuminated for some time now). Begin by doing a readout of the stored codes, and use the results to begin your diagnosis.
If by "jerks" you mean the transmission is slipping (engine revs but car slows down or doesn't accelerate), you have a transmission issue. If the transmission fluid and strainer/filter have not been replaced within the past 5 years or 50,000 miles, have a complete transmission service performed.
If by "jerks" you mean that the steering wheel wobbles or pulls, you have a problem with the front suspension.
If by "jerks" you mean that the car shudders or pulls when you apply the brakes, you need brake work.
I think I covered all of the "jerks." ;)

the jerking may be due to uneven braking on either side of the car it may be that a piston is stuck. need to take car off the road remove tyres then brakecalipers a good indication that a piston is stuck is when you disconnect the brake lines and pull pads/caliper of the rotor the piston will be extremely hard to move

Sounds like an EGR Valve

Think your best to have a repair shop look at it

If it doesn't **** to the left or right, then check your engine and transmission mounts.

Are the engine rpms climbing when its jerking forward? seems like it could be a Transmission torque converter problem.

sounds like you need AAMCO free estaments from coast to coast as it sounds like you have cooked your trans and will soon need another

could be o2 sensor

Hi there, let me see if I can help.

There's not much info to go on here, but let me try.....

Ok, if it's "pulling or stopping" in a jerking motion. It sounds like it might be engine related, however, it can be transmission issues also. Lets talk about engine.

Are there any check engine lights? That may be a clue that it's engine related...such as an engine miss.
Try putting the car in park and rev the engine from idle. (note: don't go into the red zone on RPM.) Does if feel rough and jerky? this eliminates the transmission. If so look at cyl miss issues, timing belt "out of time," EGR stuck open....etc...


If the engine passess this test, test drive the vehicle for transmission problems. Find an open road that does not have much traffic. Test at 20, 30, 40, 50, and 60 mph. go to a cruise at speed indicated and then accelerate at light throttle and then heavy throttle then coast.

Do you feel it only when applying power? Nothing on deceleration?

if it does it on most of these speeds (particulary at higher speeds) look at inner C/V joint. You will need to take apart the joint and look at the race for ridges. The vibration can happen when the rollers fall into the worn spots and causes a "jerking" feeling when applying power. (look for leaking grease from inner joints. Damage usually happens when all the grease leaks out.

If it only happens at and around 40mph, it could be a torque converter clutch. Try a transmission flush.
(drain, refill, and run through all the gears P,R,N,D,2,1 BE CAREFUL HERE!!! Keep your foot on the brake. USE YOUR HEAD!!!!!!!!! Don't run vehicle on jack stands. Repeat 3 times. ONLY USE HONDA TRANS FLUID. Yes, it does make a difference! Will take about 12 qts to do a proper flush. See if the problem goes away.

It might need a transmission it it continues after the flush, or you have some other problem that isn't obvious to me with the given info. Hope this helps and happy hunting.

Chris

this car must be under the factory warranty.
take it in this car is unsafe to drive