My 92 f150 seems to shift to early when applying light throttle.. if you drive it hard it'll shift ok. But when just cruising through town it seems to shift early 3rd and 4th. The speedometer is also a few miles mph slower than it should be. Factory tires size are installed. Any ideas as to what to look for?
E4od seems to shift early
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Kestas
Staff member
There is a connection on the side of the transmission that links to the throttle. It may need lube. It gets arthritic over time. I had a similar problem with my 91 E4OD.
JHZR2
Staff member
Originally Posted by Kestas
There is a connection on the side of the transmission that links to the throttle. It may need lube. It gets arthritic over time. I had a similar problem with my 91 E4OD.
I was going to ask if there is a Bowden cable on this AT, like Mercedes uses on my old diesels.
Misadjustment or lack of lubrication on this can cause early or late shifts...
There is a connection on the side of the transmission that links to the throttle. It may need lube. It gets arthritic over time. I had a similar problem with my 91 E4OD.
I was going to ask if there is a Bowden cable on this AT, like Mercedes uses on my old diesels.
Misadjustment or lack of lubrication on this can cause early or late shifts...
Originally Posted by eljefino
There's a way to adjust the speedo for tire size on that. Has to do with shorting a couple pins then negotiating the trip odometer button. Even though you have stock tires now, who's to say a previous owner didn't monkey with this?
That's a good idea if you can figure out how to do it. I bought a Chevy new and always thought it held gears longer than it should have, especially considering the low first gear in a 4L60E.
I calculated tire height by measuring circumference and found the stock setting of 30" was too tall by .75 to 1" depending on the tire brand. Adjusting the tire size with a Hypertech programmer makes it shift a bit earlier and makes the speedometer accurate according to roadside radar trailers.
Here are Hypertech's directions for calculating tire size. (I also measured around a tire removed from the truck and got a lower height than the stock setting and the tire manufacturers' figures.)
1. Place a chalk mark on the tire where it contacts the pavement
and also mark the pavement. These marks should be at the center
of the tire footprint pointing straight down to the pavement.
2. Roll the vehicle in a straight line until the chalk mark makes
one revolution and is pointing straight down at the pavement
again. Mark the pavement again at this new spot.
3. Measure (in inches) the distance between the two (2) marks
on the pavement. Divide the measurement by 3.1416. This
will give you the tire height in inches.
There's a way to adjust the speedo for tire size on that. Has to do with shorting a couple pins then negotiating the trip odometer button. Even though you have stock tires now, who's to say a previous owner didn't monkey with this?
That's a good idea if you can figure out how to do it. I bought a Chevy new and always thought it held gears longer than it should have, especially considering the low first gear in a 4L60E.
I calculated tire height by measuring circumference and found the stock setting of 30" was too tall by .75 to 1" depending on the tire brand. Adjusting the tire size with a Hypertech programmer makes it shift a bit earlier and makes the speedometer accurate according to roadside radar trailers.
Here are Hypertech's directions for calculating tire size. (I also measured around a tire removed from the truck and got a lower height than the stock setting and the tire manufacturers' figures.)
1. Place a chalk mark on the tire where it contacts the pavement
and also mark the pavement. These marks should be at the center
of the tire footprint pointing straight down to the pavement.
2. Roll the vehicle in a straight line until the chalk mark makes
one revolution and is pointing straight down at the pavement
again. Mark the pavement again at this new spot.
3. Measure (in inches) the distance between the two (2) marks
on the pavement. Divide the measurement by 3.1416. This
will give you the tire height in inches.
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