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Old 11-25-2006, 12:08 PM   #1 (permalink)
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drive train problems(grinding noise)

i am runing a sbc with a sm465 mated to a 205 and a 14 bolt rear end. the problem is when ever my foot isnt on the gas it makes a grinding noise. it doesnt do it when im on the gas.you can really notice the noise in 3 and 4th gear. transmission was rebuilt and i put a different 205 in it and still does the same thing. the rear end is new and has a detroit locker. i dont know what else it could be. any help or suggestions. thanks jon
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Old 11-25-2006, 01:26 PM   #2 (permalink)
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what are you driveshaft angles like

if they are out and your not running a cv you will hear a grinding noise until you fix it... pull out the angle reader and check them

i know cause mine did it before too
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Old 11-25-2006, 01:35 PM   #3 (permalink)
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One thing that gets looked over is the splined adapter that joins the SM465 output shaft NP205 input shaft. They wear over time and start making noise normally heard under no load condtions.
Drove me nuts trying to figure out what the noise was.
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Old 11-25-2006, 09:53 PM   #4 (permalink)
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my drive shaft angle is about 23 degrees. thanks for the suggestions i will check the coupler that joins the tranny and transfer case.
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Old 11-26-2006, 02:05 PM   #5 (permalink)
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thos trannys have problems with the synchronizers going out in 3rd and 4th. im sure that is what it is. they can be replased this better ones. the factory ones are made of brass lots of times and they get ate up. especially if you dont use the clutch when shifting
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Old 11-26-2006, 02:25 PM   #6 (permalink)
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Let me know what you find because I have the same problem but I will not have the time to look at it for a couple of weeks.
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Old 11-26-2006, 07:40 PM   #7 (permalink)
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the tranny was rebuilt a little ove a week ago and i use the clutch to shift. unless they didnt replace the synchronizers? i havnt found the problem yet but i will let u know when i do. thanks
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