Been awhile since I've posted but here goes. I had my tranny rebuilt around 10k ago. I've been having hard shifts for quite awhile. I've heard that changing the fluid and filter and refilling with merc v will help with this. Has anyone tried this.

 

Try Valvoline Maxlife or a good quality name brand. In my experience, the E4OD doesn't like subpar ATF. Maxlife made my E4OD shift silky smooth. If it still shifts hard after using Maxlife, you need to give your builder a call and ask him what's going on.

 

Thanks I'll try that.

 

we just redid a E4OD in a 2000 F350 and used Mercon V and it shifts like butter

 

I hope it does that good for me.

 

I have valvoline max life in mine, shifts great and it's original to the truck. If used oreillys house brand in it before, and it wasn't much worse than valvoline though, it still did good. I use oreillys house brand in the dodge and it shifts good as well. It also has its original transmission with 280,000 miles, some of which are pretty hard. I sometimes wonder why people have so many transmission problems, I guess I just have good luck.

 

I have no way to prove it but my thought is that people ridiculously beat the hell out of their vehicle and never bother to do any maintenance then cry the blues as if it's supposed to last forever and try to say they've been doing maintenance all along when the (burnt fluid) evidence says otherwise.....I used to work at a dealership years ago and I used to see this as common behavior from customers.

Only time I've ever had to replace a trans (which coincidentally will be on my truck, it's starting to act up a bit) was after I installed the new engine with lots more TQ/HP and drove the dog sh*t out of it and tore it up. Prior to the new engine, smooth as silk and not a peep out of the trans.

 

Yea, I've never had to replace a transmission in any of my vehicles, but I had to pull mine out of the ford when I blew out the front pump seal, and then again to replace the rear main, and flex-plate in hopes that it was cracked and making my unknown rattle. But it wasn't, but no leaky rear main! The dodge's has never been pulled out, and only thing it gets is tranny fluid and adjusting the bands. The cars just get theirs changed.

 

I finally got my fluid changed. So far it shifts smooth. I will be able to tell more about it when it gets hot outside. I used Castrol mercon v fluid.

 

Drove truck to work the other day. It still had a few hard shifts but not near as many or near as hard. Just got through changing the MLPS. Now I'll see if that helps any. I know it wasn't working exactly right because sometimes I had to wiggle the shifter to get it to start.