Erickk120
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Does the 4500 make any noise or are those pretty quiet just like the auto?
2004 6.0 NV4500 Tahoe
- Thread starter Dantheman1540
- Start date
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Dantheman1540
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Hey I just commented on your thread!
It's not silent like an auto, the NV4500 in this truck is louder than the one in my Silverado both are "rebuilt" but the quiet one was rebuilt by Midwest transmission who seems to be one of the top nv3500/4500 shops. The other was built by some dude in a garage so that could be one of the reasons it's louder.
My experience with the NV3500s is that the Magnesium case does a poor job minimizing the noise but also the synchros are much more susceptible to getting hot and noisy. I killed my NV3500 by towing too much too fast and for too long in OD, after that one event, it was extremely loud. Sounded like marbled or rocks in a coffee can being whirled around next to your ear. From my research and friend's experiences with them, that's the only way to really kill an NV3500 so if yours sounds like marbles being whirled it could be a little worn out. If it seems to be more of a sound resonance from the shifter region it's probably normal as that's what mine sounds like.
Erickk120
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Thats exactly the insight I needed! I figured manuals are a louder but depends what manual we are comparing. Yup, Mid west always comes to my head if I ever need to get something done. I dont have a boot on mine or the rubber insulator or whatever its called, so I can def, hear the trans working, and the clutch engaging/slipping. Mine doesn't sound like marbles its a constant mechanical noise, and has a light whine when giving it the beans, but then again the 3500 doesnt use tapered bearings so the gears get spread more than if it were using tapered bearings like the 4500. All in all I think am happy with it, we'll see how it holds!
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Dantheman1540
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The rubber isolator is a must especially if you switch to a Hurst shifter or any shifter with a bare metal rod. Get the biggest boot you can find and layer as much dynomatt and closed cell foam you can under the carpet. My buddy has the full center console in his NV4500 Denali and filled the entire inside of the console with soundproofing foam it's nearly silent but since it's a metal rod connected directly to the trans when you rest your hand on the shifter you can feel/hear the vibration resonance through it. The slight whine is kinda gear dependant for mine and sometimes I feel its not there at all.
Midwest was great to work with I'd totally buy from them again.
In both videos, you can hear the rattle my Tahoe has that comes from the shifter itself, fairly sure its the pivot ball vibrating against the shift gates. The only fix to that would be using something like the 6speed Tacomas have which is a poly pivot cup with a retaining clip but not sure how to make that.
In the second video you can kinda hear the whine it gets in 3rd gear I think. It's hardly noticeable but it is there. In both videos, the phone is mounted just inches above the shifter so I feel the sounds are excessively exastrubated.
JonnyTahoe
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Your driveshaft is different in the front custom welded ?
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Dantheman1540
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Yes its totally custom, from the PO then I had the back half cut off and a bigger U joint added for the 14b swap since I upgraded to a 1410 yoke.
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Dantheman1540
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Everyone like big pipes right?
I kinda under estimated to size of 4" it looks ridiculously big. Not sure I like the tip either but guess I'll find out in a month when the muffle shows up.
I kinda under estimated to size of 4" it looks ridiculously big. Not sure I like the tip either but guess I'll find out in a month when the muffle shows up.
What made you decide to go with 4”?
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Dantheman1540
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Dual 3" just isnt going to fit and going from dual 3" to dual 2.5" or single 3" seemed wrong, and 4" mandrel bent over axle pipes like the above are cheap. That one was under $80.
