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At 30 to 32 mph has a slight shudder,driveshaft completly redone still have problem,can accelerate thru but under normal takeoff it continues to shudder
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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
Sounds likes trans problem common to the Explorer, try changing the transmission fluid (mercon V) and add an anti-shudder additive. Does it happen mostly between 45-60 mph?
I am going to give you information for an F150 as you did not identify your vehicle. Some of the F150 trucks had a problem called "driveshaft whipping". For a while, Ford used a lighter driveshaft to save weight. Sometimes the truck developed your problem.
Some of the driveshafts are interchangeable and people went to Salvage yards to buy the heavier old style driveshafts. Car-parts.com is a Website with Salvage yards nationwide who will quote prices and ship a part to you.
You could try having your own shaft rebalanced and new joints put in; it may solve the problem. Or you could get a heavier Salvaged shaft and have it checked. You may want to put in new joints but you should have a guarantee from the Salvage yard.
I hope this helps you. If you do not have a truck, then update your information on your request.
I had a similar problem on my 93 Accord after I accidentally threw the car in reverse at 50 mph, obviously wrecking the transmission. When I got it rebuilt I was told the transmission pump was to blame (clogged with "shrapnel"). I, and your car manual, recommend taking the car in to get the tranny looked at. Especially considering you just had the fluid changed which is what would normally cause the problems you are describing.
shuddering under acceleration
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