e4od no overdrive after regear
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Cross-Country
Joined: May 2017
Posts: 82
Likes: 4
e4od no overdrive after regear
hey folks.
I have a 93 e250 with a 351w and e4od
the e4od is a brand new rebuild. shifted fine until now.
the van is a camper and weighs like 8500 lbs. it is 4x4 on 33s
I just got the van regeared to 4.88 from 4.10. I should note the rear axle is an ff disc brake dana 60 from an 01.
after the regear the trans wont shift into od.
it also seems to shift late, i was hoping the regear would speed the shifts up more.
also, the brake pedal is pulsing even when stopped.
the speedo is also accurate up to 20 mph then bounces around like crazy.
any idea what this is? i havent got codes out of it yet.
I have a 93 e250 with a 351w and e4od
the e4od is a brand new rebuild. shifted fine until now.
the van is a camper and weighs like 8500 lbs. it is 4x4 on 33s
I just got the van regeared to 4.88 from 4.10. I should note the rear axle is an ff disc brake dana 60 from an 01.
after the regear the trans wont shift into od.
it also seems to shift late, i was hoping the regear would speed the shifts up more.
also, the brake pedal is pulsing even when stopped.
the speedo is also accurate up to 20 mph then bounces around like crazy.
any idea what this is? i havent got codes out of it yet.
Thread Starter
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Cross-Country
Joined: May 2017
Posts: 82
Likes: 4
I believe the torque converter isnt locking up.
something going on with pcm it isnt telling it to lock.
it will shift into OD when coasting but as soon as it gets gas it downshifts into third and sticks there. it also wont accelerate and feels sluggish.
I have to descend a long mountain grade I wonder will that damage the trans if it isnt locking up? I could try to keep the speed down but it will toast the brakes.
Thread Starter
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Cross-Country
Joined: May 2017
Posts: 82
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the whole rearend was changed to an '01 full floating dana 60 from an ambulance. it originally had 4.10 gears. now it has 4.88 and a yukon zip locker.
it has a speed sensor in the rear diff. I do not know if it is reading from the trans/transfer case as well. it was not originally a 4x4 van or trans.
it has a speed sensor in the rear diff. I do not know if it is reading from the trans/transfer case as well. it was not originally a 4x4 van or trans.
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
How are you checking for codes? Code reader or counting flashes
Which tests did you run? KOEO/Stored Code display or KOER
Which tests did you run? KOEO/Stored Code display or KOER
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Thread Starter
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Cross-Country
Joined: May 2017
Posts: 82
Likes: 4
obdi code reader. did not do koer, just stored and koeo
FTE Legend
Joined: Nov 2015
Posts: 30,915
Likes: 4,123
From: Angier, NC
That is what I was thinking.
You have a lot of different things going on in 1 truck 
So both rears had a wire going to them that was the VSS feed to the ECM?
This started after the rear swap I would look if both rears have the same count for the VSS.
Could the ECM be set up for the 4.10 gears and not the 4.88 gears?
Just throwing thoughts out there.
Dave ----
the whole rearend was changed to an '01 full floating dana 60 from an ambulance. it originally had 4.10 gears. now it has 4.88 and a yukon zip locker.
it has a speed sensor in the rear diff. I do not know if it is reading from the trans/transfer case as well. it was not originally a 4x4 van or trans.
it has a speed sensor in the rear diff. I do not know if it is reading from the trans/transfer case as well. it was not originally a 4x4 van or trans.
So both rears had a wire going to them that was the VSS feed to the ECM?
This started after the rear swap I would look if both rears have the same count for the VSS.
Could the ECM be set up for the 4.10 gears and not the 4.88 gears?
Just throwing thoughts out there.
Dave ----
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
No, that isn't possible. The PCM isn't set up for any specific gear ratio. It is set up for a specific number of teeth on the tone wheel. And if there were a different number of teeth on the wheel it would still read steady, but the speedo would be higher or lower, not bouncing.
One of the teeth could be damaged, or the sensor on the diff is damaged, or the wiring to the sensor is damaged. Or the PSOM on the back of the instrument cluster happened to fail at the same time that the rear end was swapped.
One of the teeth could be damaged, or the sensor on the diff is damaged, or the wiring to the sensor is damaged. Or the PSOM on the back of the instrument cluster happened to fail at the same time that the rear end was swapped.
Logistics Pro
Joined: Aug 2014
Posts: 3,559
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Did you drain fluid, open up diff cover on new rear end, inspect tone ring?
I recently swapped rear ends, had very bouncy speedo, changed fluid, it got better. Probably a bad connection at Vss and fluid change was a coincidence
I recently swapped rear ends, had very bouncy speedo, changed fluid, it got better. Probably a bad connection at Vss and fluid change was a coincidence
Thread Starter
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Cross-Country
Joined: May 2017
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No, that isn't possible. The PCM isn't set up for any specific gear ratio. It is set up for a specific number of teeth on the tone wheel. And if there were a different number of teeth on the wheel it would still read steady, but the speedo would be higher or lower, not bouncing.
One of the teeth could be damaged, or the sensor on the diff is damaged, or the wiring to the sensor is damaged. Or the PSOM on the back of the instrument cluster happened to fail at the same time that the rear end was swapped.
One of the teeth could be damaged, or the sensor on the diff is damaged, or the wiring to the sensor is damaged. Or the PSOM on the back of the instrument cluster happened to fail at the same time that the rear end was swapped.
the fact that it reads accurately up to 20 ish mph is very strange.
after the rear end swap the speedo read accurately but would wiggle a bit at higher speeds/on the fwy. I never recalibrated the speedo.
I have to call the shop that did the gears and ask about what they did before I drain it and check the tone ring. they would have found this on their test drive. it pissed me off that they didnt tell me about it.
best case scenario its something with the vss sensor. fingers crossed.