Slipping into first gear when driving past 40 mph

just by your description (detailed) id say it could go a few directions ??4 a cause, one way is the 40 mph is near the speed that overdrive is engaged (42 mph) these do sometimes have problems inside them (gears ) also the stutter you mention is sort of an indication that your torque converter didn't lock up or is locking/.unlocking this is an indication of a immanent torque converter failure , if car was made past 2001 then chances are good it has some kind of transmission control system that could log a fault to help you look for a cause like a faulty speed sensor or something , ck your codes !!

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Sep 8, 2009 - My 99 Dodge 2500 Ram won't accelerate..transmission is NOT slipping,.... It has been running fine and the check engine light even cleared itself yesterday.... So it wouldn't go into first gear and then 3 minutes later my check engine ... I have a1997 Dodge Ram 1500 with a 5.9L instead of the stock 5.2L. It ...

Dodge Ram Idle and Stalling Problems - Car Forums at Edmunds.com

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Aug 17, 2011 - 30 posts - ‎25 authors
Learn more about Dodge Ram Pickup 1500 at the Edmunds.com ... The crank sensorwas put on however it started stalling again. ... The truck starts fine, but will only runat 2000's RPM and only then if .... Then as I start driving about 1/3 of a mile go dead again, I knockout of gear, crank back up immediately.

WILL NOT GO OVER 30MPH WITH PEDLE TO METAL ...

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I WAS DRIVING FINE AND THE CAR ACTED LIKE IT GOT STUCK IN ... Then the transmission didn't want to change into 2nd gear. .... Whenever i start up my car theabs and esp light turn on and when i try driving it doesnt go over 30 mph even .... in neutral but not it just wont go up hills and i think it has something to do with

Sounds to me like the car is in limp mode. This happens when the cars computers see something very wrong, and locks the transmission into second gear. This would explain the boggy feeling at take off and the limited speed. You should definitely get your check engine light checked out to see what code is there. Only then can you pursue the problem further.

change the trany fluid and filter. get some lucas transmission treatment and put it in before you put your trany fluid in. after all fluids are in and everything is together start the vehicle and hold foot on brake and go through the gears it might slip a lil the first 5 min of driving or until fluid works through trany.

sounds like a bad spark plug or spark plug wire

The only things that hold you back are:

A totally clogged gas filter
A blocked exhaust converter
A slipping transmission

Rare to fall back to a slower speed

Have you checked your transmission fluid level and your transmission filter? That's a common cause of slippping.

you should go to a transmission guy they have computers that will find the problem and i think that its free... but i think that your transmission needs to be rebuilt, theres a lot that can go wrong with them things

simple tune up could do it, or a bad MAF or MAP sensor could give similar problems

• You can check the oil on your transmision

But more likely a faulty selector you are gonna have to take it to a service agent sorry