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While driving on the freeway my automatic transmission on a gmc sierra 1500, would not shift to 3rd gear? checked the fluid level, the linkage already, someone told me I needed a commutateur interuptor? also this is a new transmission but they apparently didn't change this part.
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You don't have a clutch in that automatic, check your transmission fluid first. Make sure you run your truck for 10 min. or so before you check the fluid level. If your fluid is correct then take it to a mechanic, they can check your transmission with their computer and see exactly what is happening when it can't find 4th gear.
rec check fluid first. If trans fluid hasn't been changed in last 30,000 miles change fluid, filter and pan gasket. At that time inspect for foreign materials in bottom of pan or on magnet if you have one. If truck has over 100K and fluid was never changed you may have more problems if changing the fluid.
Climb under your pickup and look where the cable connects to the side of the transmission and make sure there is not any mud around the cable or around the shift linkage hookup. If so clean it off and see if it will shift. We have found many of these with mud caked around the shift linkage or a lot of ice buildup and wont allow it to shift into park.
Why are you putting it into drive while you are rolling backwards? That is a big NO NO. If you are at a stop and put it into drive and accelerate, and nothing happens, then your trani needs to be rebuilt.
Check the fluid while the engine is on in park..
If fluid is not low - it could be a vacume or modulator issue.. (the modular tells the trani when to shift via vacume presure)
Some shops give free estimates.
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