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I am thinking that the idle rpms are too low and the tune up is not good enough to compensate for the drop in rpms when the transmission is engaged
normal idle rpms on an automatic should be around 850rpms as they will drop 250rpms on gear selsction
any idle speed around 500 rpms will die when fear is engaged
you need to let the RPMs drop down to match the speed you're going for the next gear, though this is less efficient than power shifting through.
Unless you're slipping the clutch to smooth out the gear change, yes, there will be a definite surge every time you grab a gear in a manual transmission vehicle. Most automatics will also shift noticeably harder at WOT.
For more sedate, "normal" driving, you can shift slower and feather the throttle a bit more to smooth out the gear changes, but when you're ******* the throttle as soon as the clutch engages, it's going to be a firm shift. I hope is ok.
Turn the electronic transfer
case from "2WD" to "4WD Lock" to engage the high range 4WD, if the dodge
truck is equipped with an electronic transfer case; otherwise, shift
the transfer case lever from "2H" to "4H." The electronic transfer case
is located on the instrument panel and is marked with "2WD," "4WD Lock"
and 4WD Low." The lever-equipped transfer case is located to the right
of your leg and is marked with "2H," "4H" and "4L."
Shift the transmission into
"Neutral" while the vehicle is either stopped or rolling at 2 to 3 mph
to begin engaging in the low range 4WD. Turn the electronic transfer
case to "4WD Low," if the Dodge truck is equipped with an electronic
transfer case; otherwise, shift the transfer case lever from "2H" or
"4H" to "4L."
Tips & Warnings
Indicator lights will come on and alert you that your vehicle is in either the high or low range of 4WD.
Do not engage in the low range of 4WD drive if the transmission is in gear; you must shift to "Neutral" first.
trucks allow you to shift from 2-wheel drive to the high range of 4WD
at up to 55 mph--consult your truck's manual to ensure that this is
possible. Do not exceed 55 mph while engaged in the high range of 4WD.
Do not exceed 25 mph while engaged in the low range of 4WD.
Do not engage in 4WD unless you are on slipper or rocky roads.
I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part