here's another question, when does your truck shift? Mine shifts at 4700 to 4800rpm? which is low compared to all the you tube videos ive been looking at????

 

Well if i'm accelerating normally in town it shifts about 2k or 2.5k rpms or 30-40mph, a little higher if i'm on the gas. If i'm going slow under 30mph it shift about 2k rpms. Another note it is a much harder shift at higher rpms which is what i would expect, almost normal under 30mph.

 

thats about right for normal driving, mine is a little rougher in the 2-3 all the time. And normal under WOT shifts, when does your truck shift during wide open throttle? I just posted about mine being low at 4700rpm when ever truck i drive or seen on you tube is at 5000 to 5100rpm shifts

 

I don't know never had it at open throttle before, will try to do that today. We just got 6" of snow i'll try it this afternoon after its melts a bit.

 

yea dont do anything that will make you crash your new truck! Im calling Sun Coast Transmissions now to speak to someone about that 2-3 shift valve

 

thought id bring this thread backup, to the OP did you ever fix your 2-3 hard shift yet? Ive talked to two shops and i get the same answer, Fords autos suck you have almost 100k its time for a rebuild!

 

Mine has a hard shift between 2-3 as well. So hard it feels like the truck got rear ended and the serpentine belt squeals. If I turn off my 5 Star it will slip slightly but not shift hard at all. I am pretty sure this is due to worn clutches and since the tune increases the line pressure it causes a harder shift to make up for the slipping. Pulling my tranny out tomorrow and doing a rebuild. I'm curious to see how bad my clutches are.

 

https://www.ford-trucks.com/forums/12...-3+shift+4R100

Have a look at the second page on this thread. If the link doesn't work put hard 2-3 shift 4R100 into the search box and look for the link dated 1/22/13 by maxfam.

 

I have a 03 fx4 super cab it down shifts hard I've changed the trans filter changed the plugs and wires truck has no leaks at all the hard shifting is driving me nuts

 

Have it scanned for codes. And not at an auto parts store, they can't read the codes that you need.

 

after fixing my trans issues and talking to Brian from BTS seems the 4R100 have alot of issues. Most of the time being a bad or broken shift spring, i installed a transgo shift kit and even though i didnt find a broken spring the transgo kit COMPLETELY fixed my weird shifting issues

 

Mine will hard shift from second to third if I am accelerating but let off the gas before it shifts. How hard is it to install the transgo kit?