Join Date: Sep 2009
Location: Eastern NC
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Sounds like your in "limp mode". Go ahead and try the filter and prefilter, but since you say it runs fine once you get up to speed, then I would look at trans. Next time you drive truck, count the number of shifts. You should have 4 definite changes in RPM's as you get up to speed. If shifts are missing as you describe, first, try checking for codes with an OBDII scan tool. If codes are present they will give you a direction to go. Most times if you are in limp mode they will be present since the computer controls trans. Also, check the simple things first like fluid level. Always check fluid with engine running at idle, parking brake engaged, trans in neutral and up to temp. What color and smell is fluid? If not bright red and smells burnt, then bad things could have already happened. Limp mode is caused by governer pressure signal that is sent to PCM. It can be caused by low or high governer pressures detected, bad signal altogether that is caused by bad sensor, solenoid or wiring. You may also need a pressure check on trans to verify whether a sensor, solenoid or trans itself is bad.
'96 Dodge 3500,KDP killed, boost-pyro-trans temp, not stock anymore
'01 Dodge 2500 4X4, EC, LB, 6 speed, FP-pyro-boost,
'97 Chevrolet Suburban, K1500, 4.10 gears