Get you a bottle of ford friction modifier and pour it into the trans and drive it for 15 to 20 miles.if it's in torque converter it will go away
Shudder is usually a transmission concern with the torque converter. 40 MPH indicates a range in which the tcm engages torque converter lock up, and most shudder concerns happen at this time. Need a scan tool to be exact. Obviously could be another concern. Without driving I would not know. If it is a shudder, in my experience a complete transmission service with filter and friction modifier will usually remedy the concern in the short term... however... complete rebuild is not usually far off in the future. I have seen other internal transmission issues following this about 20 to 30,000 miles after fixing the shudder
SOURCE: will not accelerate past 40 mph
simple tune up could do it, or a bad MAF or MAP sensor could give similar problems
SOURCE: hesitation at 40mph and 50 mph.
A pop and hesitation is likely a backfire. The hesitation around 40 and 50 would be in keeping with that theory. There are several reasons you might be getting backfires and hesitation. If your ECM is adjusting the engine to run too rich this could happen. Misfiring might be occuring. Timing could be out. But one of the most likely is a restricted exhaust, likely due to a plugged, damaged or worn out catalytic converter. In some cases the converter may be bad enough to be giving you some performance problems, but not yet quite bad enough to signal an error. A vacuum test can help confirm whether this is exhaust related.
SOURCE: I have a 90 Pontiac 6000 that starts just fine
Check your transmission lock-up. It's programmed to come in at at 40mph. You can replace the lock-up to come in at 60mph or better.
Or you may have some ignition wires going bad or distributor cap has crack in it.
SOURCE: 2004 GMC sierra 5.3 eng 1500 transmission shutter 40-55 mph
I too have that problem. I own a 2005 GMC Yukon. Shutters between 40 + 55 mph. I thought for sure the stumble I felt was a plug or coil pack because it only does it under a load. With A/C on the whole truck shakes! But it wasnt the plugs or coil packs. Answers anyone?
SOURCE: 99 dodge ram that jerks between 40 and 50 mph
Bring it back to the transmission shop and have them test drive it with the scanner to see if the Throttle Position Sensor (TPS) needs to be replaced. A worn TPS will case the transmission to have shifting problems, the TPE sends voltage signals to the PCM and will control the transmission shift points and firmness. If the TPS has a flat spot and the voltage is down at the point where the transmission needs to shift, there may be a conflict of shift program and needs to be addressed. Good luck and keep me posted.
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