Question about Cars & Trucks
It could be several things. First check the fluid level. Make sure it\'s full. Also check trhe condition of the fluid, it should be pink and smell oily. If it is a dark red or brown or smell burnt, then it needs to be changed first. second, when was the last time the fluid was changed? GM recommends 100,000 mile unless you are in heavy city traffic in areas of 90 degree weather, hilly or mountainous terrain,frequent trailer pulling or commercial delivery. In these cases, every 15,000 miles. If an oil change is in order, add a bottle of Lucas transmission treatment. Also change the filter. If you find a lot of crap in the pan, you may want to do another change ion the near future to be sure everything is flushed put.
If that is all in order, the most likely culprit is the governor. It is behing the round steel cover held in place with a piece of heavy wire. Have a catch pan handy when you pull the cover and watch for the O ring. Clean the governor assembly with solvent and make sure everything moves freely and easily. Wipe out inside the housing and put it back in. If you still have trouble you will have to go to a shop and have the valve body looked at.
Posted on Oct 13, 2013
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Posted on Jan 02, 2017
you may be confusing the torque converter clutch engagement with o.d. this trans has a problem with the T.C.C. regulator valve wearing out the valve body bore. this will cause the converter clutch to engage only sometimes or not at all. this will set a P1870 code in the control module. when this code is stored in the controller, ( check engine light may or may not be on), it increases the pressure in the transmission causing the 1-2 shift to be harsh. ask a local tranny shop to scan the vehicle ( most will do this for free) if this is the problem they can either fix your valve body (sonnax parts) or replace it with an upgraded valve body. hope this helps
Posted on Dec 16, 2009
all you need to do is listen to hear the tank switching valve is working. It will make a soft noise under the rear cab section with the key on with the engine off. zif you do hear it sounding the switch your tank unit for that one tank you try to switch to is a fault. Sorry no illustrated diagrams are on hand, just knowledge
Posted on Feb 05, 2010
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