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Old 02-03-2010, 02:24 PM
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Clutch Slipping

My clutch in my 99 has started to slip if i get into the throttle at all. Especially if I turn the chip up at all. The clutch only has like 12,000 miles on it. Is it really worn out or is there anything else to check?
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Old 02-03-2010, 04:17 PM
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Hey there I feel your pain. I had a simmilar problem and have done a great deal to my truck and learned a lot in the past month or so. Here is a link to another thread that may help you before you tear into your trans.
clutch slippage
Before you drop your tranny, make sure you dont have fuel pooled up in the valley of the block. After all was said and done I am not thrilled with how much work I've put into my new clutch and for that matter the Southbend clutch itself. If I had it to do over, I would definitely have just bought a replacement clutch WITH springs in it. Our truck now has a resonance @ 1700 RPM in all gears that is driving me up the wall. It is apparently a nasty side affect of the more rigid pucks that are in the Southbend clutch disk. I do have to say though that the clutch job on these trucks is easier than any other vehicle I've ever done. Good luck.
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Old 02-03-2010, 04:55 PM
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What does the fuel have to do with anything? How would that hurt the clutch? I will have to check it out tommorrow but dont think i got any leaks.
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Old 02-03-2010, 08:17 PM
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i have a factory clutch in my 00 it was 105k on it and if i turn my programer up above stock it will slip. i had to put a new tranny in it a few months ago because i snapped the main shaft in it, and the shop said the clutch was good but i had a slightly worn pressure plate. my buddy runs a 99 with a factory clutch with 150k on it and he can run his chip up to 150hp? i think and it does not slip. i think it just depends on the tires and if you have a lift i guess. i had 38x14.5 toyos and the switched to 37/13.5 bfg km2s and it seems to not slip as much. i am soon going to put a south bend clutch in it though. good luck
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Old 02-04-2010, 05:17 AM
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Check for Fuel and Oil leaks in the valley. A lot of times this will leak down and cause the clutch to slip.

Or it could just be the clutch you got it under rated for the power
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Old 02-07-2010, 07:02 PM
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Its been snowing like crazy here so haven't had time to check for any fuel leak but in my truck I have no problems shifting at all. If the clutch was wore out wouldn't it be harder to shift into gears? I would assume if its slipping that its wore out or am i wrong? If fuel is getting on it and I get the leak stopped will the clutch be ok?
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Old 02-08-2010, 05:13 PM
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BUMP!!!!!!
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Old 02-09-2010, 01:01 PM
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I have a feeling that if you do have a fuel leak caused by the fuel/water seperator valve or the fuel filter and you fix the leak and dry up all the fuel you will probably be ok. I'm not sure if the fuel will contaminate the clutch disk and make it slip permanently but it couldn't hurt to check it out. And as far as the clutch is concerned with shifting, a worn out clutch will have no negative affect on shifting the transmission. It will in all reality probably make it easier to shift. Signs of a worn out clutch are failure to solidly engage after you shift and apply throttle, or failure to hold the power as you accelerate.
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