cant get it to sound right?? help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

loenuf · 07-03-2001, 05:52 PM

i have a 96 x-cab auto w/305. i just installed a flowmaster and sounds great until i downshift. at first it rummbles nicely, but after a split second, something takes over and the rummble goes away. my 88 did the same exact thing. i cant get rid of it. whats causing this and how do i fix/dissconect it? it only sounds good when you dounshift to second, but after one or two rummbles, it goes away! and sounds like crap. someone said modify the smog pump, but i dont have one. thanks guys, this is realy gettin to me......

Chevyman69 · 07-09-2001, 01:32 AM

I don't see how anything can really make the truck sound different. I am in a different ballpark because I have duals with no cats and my trucks sounds sweet especailly with the headers. I know people with Vortec trucks who installed dual exhaust and kept their cats and they always soung the same. Just sounds like the muffler itself is the problem and plus the fact you have stock single exhaust which never sounds good to me anyway. Does the truck run normally when it sounds bad because it is possible something is screwing up the computer but other than that I would just say that is how the truck is going to sound and it is just the way the muffler is.

------------------
69 CST 10, 402, steel crank, heavy rods, Federal Mogul Forged Pistons, 9.9:1 compression, polished ported 781 heads 2.19/1.88 manley stainless valves, Crane Powermax Hydraulic roller 288/296 and .587,.610 lift, hardened pushrods, Crane Roller Rockers, Weiand Action Plus, 750CFM Edelbrock QJET, MSD HEI, MSD 8MM Wires, should be about 500 H.P. 700R4 2500 stall, pretty nasty shift kit, 373 Auburn Pro Series Posi, buckets/console air/tilt/tach 4wheel discs
Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, loaded, 350 Accel filter/cap/rotor/coil/AC Delco RapidFire plugs, Edelbrock intake and headers, true duals 700R4 with B@M Shift Kit for now!

jskrours · 07-17-2001, 05:12 AM

I bet you have a Auto. trans...

loenuf · 07-18-2001, 05:34 PM

yes i do! is it the lock-up converter doing this? if so can you dissable it? thanks.

Chevyman69 · 07-19-2001, 10:27 PM

Sorry guys but disconnecting the lockup in the convertor won't do a damn thing to the way the trucks sounds, it would be stupid to unhook it anyway. I don't know why your trucks sound like crap because there are lots of us out there with late model trucks and better exhausts and they all sound fine.

------------------
69 CST 10, 402, steel crank, heavy rods, Federal Mogul Forged Pistons, 9.9:1 compression, polished ported 781 heads 2.19/1.88 manley stainless valves, Crane Powermax Hydraulic roller 288/296 and .587,.610 lift, hardened pushrods, Crane Roller Rockers, Weiand Action Plus, 750CFM Edelbrock QJET, MSD HEI, MSD 8MM Wires, should be about 500 H.P. 700R4 2500 stall, pretty nasty shift kit, 373 Auburn Pro Series Posi, buckets/console air/tilt/tach 4wheel discs
Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, loaded, 350 Accel filter/cap/rotor/coil/AC Delco RapidFire plugs, Edelbrock intake and headers, true duals 700R4 with B@M Shift Kit for now!

loenuf · 07-25-2001, 05:56 PM

thanks guys, it was the lock up converter, i got it fixed last week! much better!!!!

07-03-2001, 05:52 PM	#1
loenuf Registered User Join Date: May 2000 Location: trenton texas usa Posts: 232	cant get it to sound right?? help i have a 96 x-cab auto w/305. i just installed a flowmaster and sounds great until i downshift. at first it rummbles nicely, but after a split second, something takes over and the rummble goes away. my 88 did the same exact thing. i cant get rid of it. whats causing this and how do i fix/dissconect it? it only sounds good when you dounshift to second, but after one or two rummbles, it goes away! and sounds like crap. someone said modify the smog pump, but i dont have one. thanks guys, this is realy gettin to me......

07-09-2001, 01:32 AM	#2
Chevyman69 Vortec 350's Suck Join Date: Nov 2000 Location: Pickardville Alberta Canada Posts: 544	I don't see how anything can really make the truck sound different. I am in a different ballpark because I have duals with no cats and my trucks sounds sweet especailly with the headers. I know people with Vortec trucks who installed dual exhaust and kept their cats and they always soung the same. Just sounds like the muffler itself is the problem and plus the fact you have stock single exhaust which never sounds good to me anyway. Does the truck run normally when it sounds bad because it is possible something is screwing up the computer but other than that I would just say that is how the truck is going to sound and it is just the way the muffler is. ------------------ 69 CST 10, 402, steel crank, heavy rods, Federal Mogul Forged Pistons, 9.9:1 compression, polished ported 781 heads 2.19/1.88 manley stainless valves, Crane Powermax Hydraulic roller 288/296 and .587,.610 lift, hardened pushrods, Crane Roller Rockers, Weiand Action Plus, 750CFM Edelbrock QJET, MSD HEI, MSD 8MM Wires, should be about 500 H.P. 700R4 2500 stall, pretty nasty shift kit, 373 Auburn Pro Series Posi, buckets/console air/tilt/tach 4wheel discs Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, loaded, 350 Accel filter/cap/rotor/coil/AC Delco RapidFire plugs, Edelbrock intake and headers, true duals 700R4 with B@M Shift Kit for now! __________________ 69 Chev CST 10 reg cab lwb Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, K.I.A 7:51 AM 04/22/03 Will be resurrected

07-17-2001, 05:12 AM	#3
jskrours Registered User Join Date: Jun 2001 Location: Wichita, KS. Posts: 6	I bet you have a Auto. trans... __________________ Michael

07-19-2001, 10:27 PM	#5
Chevyman69 Vortec 350's Suck Join Date: Nov 2000 Location: Pickardville Alberta Canada Posts: 544	Sorry guys but disconnecting the lockup in the convertor won't do a damn thing to the way the trucks sounds, it would be stupid to unhook it anyway. I don't know why your trucks sound like crap because there are lots of us out there with late model trucks and better exhausts and they all sound fine. ------------------ 69 CST 10, 402, steel crank, heavy rods, Federal Mogul Forged Pistons, 9.9:1 compression, polished ported 781 heads 2.19/1.88 manley stainless valves, Crane Powermax Hydraulic roller 288/296 and .587,.610 lift, hardened pushrods, Crane Roller Rockers, Weiand Action Plus, 750CFM Edelbrock QJET, MSD HEI, MSD 8MM Wires, should be about 500 H.P. 700R4 2500 stall, pretty nasty shift kit, 373 Auburn Pro Series Posi, buckets/console air/tilt/tach 4wheel discs Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, loaded, 350 Accel filter/cap/rotor/coil/AC Delco RapidFire plugs, Edelbrock intake and headers, true duals 700R4 with B@M Shift Kit for now! __________________ 69 Chev CST 10 reg cab lwb Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, K.I.A 7:51 AM 04/22/03 Will be resurrected

07-18-2001, 05:34 PM	#4
loenuf Registered User Join Date: May 2000 Location: trenton texas usa Posts: 232	yes i do! is it the lock-up converter doing this? if so can you dissable it? thanks.

07-25-2001, 05:56 PM	#6
loenuf Registered User Join Date: May 2000 Location: trenton texas usa Posts: 232	thanks guys, it was the lock up converter, i got it fixed last week! much better!!!!



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