Grinding/Tapping noise under shift
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From: Pennsyltuckey
Grinding/Tapping noise under shift
Hey all,
I just had my trans rebuilt and torq. converter replaced because I thought the problem was with the trans.
My truck makes a loud harsh sounding grind/flutter noise when it shifts (only does it when I set my diablosport to 80hp and above tune). I thought for sure it was in the tranny or something because it only likes to do this when its shifting.
It seems like it wants to do it the loudest when I am on the throttle hard, and when its about to shift, I let off it. This is when it makes this grind/tap/crunch noise the worst.... It is so hard to describe, as I have never heard anything like it before...
Any ideas?
Truck is early 99, 250k miles, auto trans.
I just had my trans rebuilt and torq. converter replaced because I thought the problem was with the trans.
My truck makes a loud harsh sounding grind/flutter noise when it shifts (only does it when I set my diablosport to 80hp and above tune). I thought for sure it was in the tranny or something because it only likes to do this when its shifting.
It seems like it wants to do it the loudest when I am on the throttle hard, and when its about to shift, I let off it. This is when it makes this grind/tap/crunch noise the worst.... It is so hard to describe, as I have never heard anything like it before...
Any ideas?
Truck is early 99, 250k miles, auto trans.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by joel(PA)
no one has any similar experiences? search doesnt show much...
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Freshman User
Joined: Oct 2004
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From: Pennsyltuckey
yeah, i was thinking of that, but the noise seems to be coming from down lower, closer to the trans... I guess this could be the problem, especially if it is the turbine side, echoing down through the exhuast....
to me it just really sounds like something trans related, more like a gear grind, but since the trans was just rebuilt.... I'm not sure
actually... the more I think about it, I don't think it could be the turbo, otherwise the truck would do this all the time (no matter if i have it on "tow tune" or "85 hp tune") cause my truck boosts the same amount... around 20lbs.
If it was the turbo, I would expect it to do the same when letting off @ 20 lbs on the tow tune, just the same as if I let off @ 20lbs in the 85hp tune. Whereas, my truck only does this on the 85+ hp tunes.
to me it just really sounds like something trans related, more like a gear grind, but since the trans was just rebuilt.... I'm not sure
actually... the more I think about it, I don't think it could be the turbo, otherwise the truck would do this all the time (no matter if i have it on "tow tune" or "85 hp tune") cause my truck boosts the same amount... around 20lbs.
If it was the turbo, I would expect it to do the same when letting off @ 20 lbs on the tow tune, just the same as if I let off @ 20lbs in the 85hp tune. Whereas, my truck only does this on the 85+ hp tunes.
Last edited by joel(PA); Mar 23, 2005 at 07:21 AM. Reason: spelling
