E40D shifting ungodly hard
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Senior User
Joined: Aug 2011
Posts: 153
Likes: 3
From: flagstaff, arizona
E40D shifting ungodly hard
this just started happening. my baby is shifting super hard 
it does it from a dead stop, 1st to 2nd. very hard shift. gets better the higher up in gears. if i start off in second gear, and then shift back to drive after 1st gear shift (20-25 MPH) its a lot better and i dont experience the hard shift.
also, shifting into reverse or into drive has a clunking noise and a very hard jerk to go along with it.
so..can the experts here tell me whats wrong?
it does it from a dead stop, 1st to 2nd. very hard shift. gets better the higher up in gears. if i start off in second gear, and then shift back to drive after 1st gear shift (20-25 MPH) its a lot better and i dont experience the hard shift.
also, shifting into reverse or into drive has a clunking noise and a very hard jerk to go along with it.
so..can the experts here tell me whats wrong?
Senior User
Joined: Jun 2010
Posts: 408
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From: Curwensville,PA
im no expert but how many miles are on it? it could just be getting wore out mine had some hard shifts esp 1st to 2nd i put some lucas tranny fix in it( it supposed to help tranny slip and hard shifts) it has helped greatly in my case!
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Senior User
Joined: Aug 2011
Posts: 153
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From: flagstaff, arizona
thats what ive been hearing. ill check the codes. but do you think its electronical or mechanical
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Senior User
Joined: Aug 2011
Posts: 153
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From: flagstaff, arizona
yeah im just driving my dad's 2004 GMC sierra while we figure this problem out and it sucks. i want my baby back : )
Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
Id put my money on a sensor before an actual mechanical issue with the E4OD any day. I had the same problem at 79k miles and it was the mlps.
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Senior User
Joined: Aug 2011
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From: flagstaff, arizona
how much did that cost you to replace? did you have a shop do it? you diagnosed it with a code reader right?
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Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
No only thing I don't do myself is alignments and tires.
I did not use a code reader for the MLPS. I was just told on another website that was what was causing my issues. But you should always pull codes first before buying parts that you arnt 100% sure are bad.
Senior User
Joined: Feb 2011
Posts: 125
Likes: 2
From: ohio
mine was doing the same thing, i installed a new vss (vehicle speed sensor) on the rear differential....took about 15 minutes. also disconected my abs (rabs)........reset the computer my unhooking batt cables for a minute......never had the problem after that......could be many different problems tho....this was just my senario hope it helps
Senior User
Joined: Feb 2011
Posts: 125
Likes: 2
From: ohio
yup mine did the same thing, sometimes it would shift ok, and sometimes hard as a rock.....i bet if you swap out the vss (like 12 bucks at autozone) itll fix it, atleast its worth a shot....u dont even gotta lift up the truck and it only takes a couple minutes...and its only 1 bolt... just use pb blaster and a leverage bar on your wrench, itll pop right out. just remember to reset your computer by disconectin your battery for a bit
Junior User
Joined: Dec 2008
Posts: 71
Likes: 1
From: Eagle River, Alaska
Saved
My 1990 Did exactly the same thing when I bought it, feels like you're getting rear ended when it shifts, especially when shifting 1st-2nd?
I checked my engine codes, my Throttle Position Sensor came up as malfunctioning, the TPS tells the E4OD when to shift, without that information it uses preset shift points, which are usually both wrong and very hard, the new TPS cost me about $25 and took only about 30 Minutes to replace, and it was completely better after that, as well as added benefits on my truck.
So I suggest looking into it. Good Luck Bud.
and get on it cuz that hard shifting can over time damage your transmission.
I checked my engine codes, my Throttle Position Sensor came up as malfunctioning, the TPS tells the E4OD when to shift, without that information it uses preset shift points, which are usually both wrong and very hard, the new TPS cost me about $25 and took only about 30 Minutes to replace, and it was completely better after that, as well as added benefits on my truck.
So I suggest looking into it. Good Luck Bud.
and get on it cuz that hard shifting can over time damage your transmission.
Thread Starter
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Senior User
Joined: Aug 2011
Posts: 153
Likes: 3
From: flagstaff, arizona
My 1990 Did exactly the same thing when I bought it, feels like you're getting rear ended when it shifts, especially when shifting 1st-2nd?
I checked my engine codes, my Throttle Position Sensor came up as malfunctioning, the TPS tells the E4OD when to shift, without that information it uses preset shift points, which are usually both wrong and very hard, the new TPS cost me about $25 and took only about 30 Minutes to replace, and it was completely better after that, as well as added benefits on my truck.
So I suggest looking into it. Good Luck Bud.
and get on it cuz that hard shifting can over time damage your transmission.
I checked my engine codes, my Throttle Position Sensor came up as malfunctioning, the TPS tells the E4OD when to shift, without that information it uses preset shift points, which are usually both wrong and very hard, the new TPS cost me about $25 and took only about 30 Minutes to replace, and it was completely better after that, as well as added benefits on my truck.
So I suggest looking into it. Good Luck Bud.
and get on it cuz that hard shifting can over time damage your transmission.