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SVT Shelby GT500
2012 Gt500 Goes into gear, but wont move forward
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<blockquote data-quote="Bad Company" data-source="post: 16991664" data-attributes="member: 141815"><p>First let us start over.</p><p></p><p>1)when you are stating the speedometer moves with the car in gear and engine running, I'm assuming you have seen this in every gear of the transmission and that as you go from 1st gear through 6th gear the MPH of the speedometer is increasing in speed even though the car doesn't move. This is a Yes or No question you have to give us to help you. Does the speed reading of the speedometer increase as you go to a higher gear in the transmission?</p><p></p><p>2)if the above is true then the mainshaft of the transmission is turning, which means the clutch is engaging when the clutch pedal is released and the input shaft/gear of the transmission is turning the first cluster gear in the transmission. As you move through the gears of the transmission, power is transferred through the most forward gear of the cluster gear assembly to the gear you've selected and locked into place with the shift lever to turn the mainshaft/output shaft of the transmission. You clearly state the speedometer moves, so again I'm assuming the speed sensor of the transmission is accurately seeing the mainshaft/ output shaft rotating. </p><p></p><p>If the above is accurate and true this points us in another direction to the failure. </p><p></p><p>3)can you shift the transmission without using the clutch? Yes you can. Now my next question while you're performing this exercise is. Are you doing this after trying to going from neutral without any speed showing on the speedometer head/gauge? Are you doing this with 0 MPH showing on the speedometer? If the transmission is rotating/turning then the synchronizer of each gear will speed up the gear you're trying to engage by using a friction ring so that gear chosen locks to the mainshaft of the transmission effectively changing the speed of the manishaft as you upshift.. Without having the load of a moving car, I'd be willing to say that the synchronizers would allow you to do this without noise, but I'd also expect that the shifter might feel a little heavier in moving also. I'd also expect it to be difficult to downshift without causing the friction ring to grind a bit as you are trying to slow the mainshaft down as you go from one gear to the next lower one. </p><p></p><p>4)your driveshaft has 2 CV joints. One at the back of the transmission and another at the carrier bearing. Either one of these joints can fail under the load of trying to launch the car with a good set of tires while sitting still. I'd expect you to feel vibration if one of them failed, but if it was a clean break you may not. Again this is if everything else I've covered so far is an accurate assumption on my part of understanding what you are describing to us. </p><p></p><p>The last thing is the rear end. You could blow the spider and axle gears apart so everything turns from the clutch, to the transmission, to the driveshaft and finally to the pinion input shaft of the rear end. I'd expect you will hear a bunch of noise coming from the rear end when you're trying to move this car under its own power. If you wrung off the pinion gear input shaft then I'd expect a LOT of vibration and noise </p><p></p><p>Get the car up on jack stands to see that the driveshaft is turning</p></blockquote><p></p>
[QUOTE="Bad Company, post: 16991664, member: 141815"] First let us start over. 1)when you are stating the speedometer moves with the car in gear and engine running, I'm assuming you have seen this in every gear of the transmission and that as you go from 1st gear through 6th gear the MPH of the speedometer is increasing in speed even though the car doesn't move. This is a Yes or No question you have to give us to help you. Does the speed reading of the speedometer increase as you go to a higher gear in the transmission? 2)if the above is true then the mainshaft of the transmission is turning, which means the clutch is engaging when the clutch pedal is released and the input shaft/gear of the transmission is turning the first cluster gear in the transmission. As you move through the gears of the transmission, power is transferred through the most forward gear of the cluster gear assembly to the gear you've selected and locked into place with the shift lever to turn the mainshaft/output shaft of the transmission. You clearly state the speedometer moves, so again I'm assuming the speed sensor of the transmission is accurately seeing the mainshaft/ output shaft rotating. If the above is accurate and true this points us in another direction to the failure. 3)can you shift the transmission without using the clutch? Yes you can. Now my next question while you're performing this exercise is. Are you doing this after trying to going from neutral without any speed showing on the speedometer head/gauge? Are you doing this with 0 MPH showing on the speedometer? If the transmission is rotating/turning then the synchronizer of each gear will speed up the gear you're trying to engage by using a friction ring so that gear chosen locks to the mainshaft of the transmission effectively changing the speed of the manishaft as you upshift.. Without having the load of a moving car, I'd be willing to say that the synchronizers would allow you to do this without noise, but I'd also expect that the shifter might feel a little heavier in moving also. I'd also expect it to be difficult to downshift without causing the friction ring to grind a bit as you are trying to slow the mainshaft down as you go from one gear to the next lower one. 4)your driveshaft has 2 CV joints. One at the back of the transmission and another at the carrier bearing. Either one of these joints can fail under the load of trying to launch the car with a good set of tires while sitting still. I'd expect you to feel vibration if one of them failed, but if it was a clean break you may not. Again this is if everything else I've covered so far is an accurate assumption on my part of understanding what you are describing to us. The last thing is the rear end. You could blow the spider and axle gears apart so everything turns from the clutch, to the transmission, to the driveshaft and finally to the pinion input shaft of the rear end. I'd expect you will hear a bunch of noise coming from the rear end when you're trying to move this car under its own power. If you wrung off the pinion gear input shaft then I'd expect a LOT of vibration and noise Get the car up on jack stands to see that the driveshaft is turning [/QUOTE]
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2012 Gt500 Goes into gear, but wont move forward
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