99 expdn 5.4 whats the problem???
 

Ok I have a 99 and I replaced the motor because the old one was locked up. I bought it that way. I now have the new motor in and it runs great as long as its not in a drive gear. Then it will slowly accelerate not like its slipping its like I cant accelerate at all? I do have a check engine lite and the 4x4 like is blinking. If I put in 1st it seems to do a little better but still isnt good...When I have it in D it seems to skip 2nd altogether...when I put in reverse it almost seems normal???WTF...I put the truck in neutral and I can rev-it to the moon put in drive and it seems like 0 power...? anybody had a similiar problem...


I appreciate the feedback..I know I need to get the codes ran but I swear its like I'm afraid to drive it because it has no get up and I may get ran over..

its not going into 2nd? are you sure its not skipping 1st and starting off in 2nd? check the codes, it'll help alot.

that could be a possibility but when I manually put in 1st and drive it then try to manually shift to 2nd it stays in first until I shift it to third...?

sure its full of transmission fluid?

If you are afraid to drive it, see if you can borrow or rent a code reader.

yeah that was the first thing I thought of....but its up to the top..

hmm. transmission filter loose?

Something I hadnt thought of...i did see where you had posted it somewhere else though. I just need to find a few clean pans to see so I dont have to buy new fluid as I just filled it..

yea it sucks and you lose it all mainly, but yea my buddys s10 wouldnt drive till you gassed the crap out of it, we put the filter back and it ran fine

In that case, I would drain into quart bottles, preferably clear bottles so you can see.

You can re-use all but the last 2 quarts, - they will have all the contamination.

You can see it with clear bottles.

However, it's not recommended, - I have tho when I was adjusting shift points thru hardware.