The truck is up shifting at to high an rpm, but will go through the gears it also helps to take your foot off the gas. These conditions will cause slippage at the start of the shift with a hard apply at the end. The taillights n some tranny wires are ran on the same circuit. Transmission shifts hard into second and only after the rpms have gone very high. The chart below can give you a better location of where to start with the pinpoint test.
At this point it's recommended to take your transmission into the shop and tell them what you think is wrong with it. It is easier for the clutch pack to hold than it is for it to engage initially so this is a common first sign of problems. Doctor, explores the causes of harsh shifting in automatic transmissions. The torque converter is unlocking. You can find the table to decode the transmission letters by visiting our article. If this happens to you, have no fear! Sometimes my truck shifts fine and other days it shifts hard.
Ford sells an update kit that comes with a new Range sensor, and an updated connector with an improved seal. A similar looking unit will be in the same place on other transmission types. This article applies to the F-150 2004-2014 and F-250. In this case the converter will need to be replaced. The modulator valve is what tells the transmission when to shift and what gear to shift to. You may be stuck in gear and have strange shifting from one gear to another. Your sticker might not look exactly like this, but the format should generally be the same.
Help us help you, and others. When this happens, the transmission will skip to the next gear like you said. When I got it back the engine seems to rev higher even in overdrive. Large curves of metal are evidence of broken servo clips or other hardware. If you don't have any codes, though, the next steps might be of some help. It sounds like your intermediate clutch pack has worn out. Fluid looks clean, no smell.
I scanned the computer and came up with a code 99 ecp circuit failure. You may be stuck in gear and have strange shifting from one gear to another. Step 6 - Replace reverse servo If you find evidence of broken servo or metal in you transmission fluid pan, there's a good chance that your transmission's reverse servo has died. Last updated on January 5th, 2008. This article will cover some of the ways you can diagnose and. Figure out how to get it back in motion here! This would keep the engine from having problems due to the electronic transmission being disconnected.
The truck runs great and ive had this trany rebuilt twice and it seems to mess up right after the warranty goes out. Illustrated above are the line pressure tap points for the 4R7xx family of transmissions in F-150s and Super Duty trucks. A similar looking unit will be in the same place on other transmission types. And remember, the companies that re-manufacture transmissions are very easy contact. Cuz of my lack of know how I have been out of work for a month. At times my overdrive light flashes and the transmission shifts very hard, what could cause this? This article will cover some of the ways you can diagnose and.
Step 4 — Test transmission pressure Testing the pressure will help to diagnose if the valve body is the issue without needing to remove the valve body. If the engine is not running properly, you need to resolve any problems before resuming the transmission diagnostics. Both problems will require the removal of the transmission from the vehicle. Also sometimes it will not shift into 3rd gear. Fluid is leaking from the front of the transmission.
You will want to make sure that your truck isn't actually skipping second gear and going right to third. A problem with the line modulator valve could also cause this, but it would usually effect more than one gear. When the problem is not present it works perfectly. Step 1 — Check to see which transmission the truck has Check the door jamb sticker in the F-150 or F-250 Super Duty to figure out all sorts of information about the truck, including which transmission it has. Or, invest in a service manual for your particular year, make and model of Ford. This article applies to the Ford F-150.