fluttering or tapping at shift changes
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Freshman User
Joined: Mar 2005
Posts: 33
Likes: 1
fluttering or tapping at shift changes
I have a 99 F350 with a V-10 and an auto tranny. It has 148,000 miles on it. When driving I here a noise right at the point the tranny shifts. I can't tell if it's exhaust flutter, piston slap or what. When in park or neutral and I rev the motor it doesn't do it, only under a load. I've tried all grades of gas and octane boosters with no help. Has anyone else delt with with this problem? Thanks
Logistics Pro
Joined: Jan 2002
Posts: 3,733
Likes: 38
Four possibilities in my order of best guess
1 Trans and torque converter getting sloppy
2 Loose vibrating exhaust or trans shields
3 Piston slap
4 Flutter
True exhaust flutter is almost always under load at low speeds and rpm constant noise and not just between shifts
Piston slap on that old a motor falls into if they didn't break by now they will last until the rebuild
The 4R100 tranny can and does tend to exhibit more and more noises as they get much beyond 100K on them. Get a good flush and re-lube and see if it still does it then have a tranny specialist take a peek. The rebuilds are not as bad if you do it before bad damage happens.
Check out Brian at Brians Truck Stop BTS google it
He does a terrific job at making them bullet proof... on the other hand only if you have plans to keep it another 150K
Many of us track down the "flutter" to loose and resonating shields or the tin cover in front of the trans bell housing. Many times the exhaust shields have little gravel inside or broken spot welds and they can make a racket. We take the tin tranny shield off, bend it in half down the middle, bend it back sort of flat and reinstall it. Makes it stiffer and quiet.
1 Trans and torque converter getting sloppy
2 Loose vibrating exhaust or trans shields
3 Piston slap
4 Flutter
True exhaust flutter is almost always under load at low speeds and rpm constant noise and not just between shifts
Piston slap on that old a motor falls into if they didn't break by now they will last until the rebuild
The 4R100 tranny can and does tend to exhibit more and more noises as they get much beyond 100K on them. Get a good flush and re-lube and see if it still does it then have a tranny specialist take a peek. The rebuilds are not as bad if you do it before bad damage happens.
Check out Brian at Brians Truck Stop BTS google it
He does a terrific job at making them bullet proof... on the other hand only if you have plans to keep it another 150K
Many of us track down the "flutter" to loose and resonating shields or the tin cover in front of the trans bell housing. Many times the exhaust shields have little gravel inside or broken spot welds and they can make a racket. We take the tin tranny shield off, bend it in half down the middle, bend it back sort of flat and reinstall it. Makes it stiffer and quiet.
Senior User
Joined: Mar 2002
Posts: 476
Likes: 3
From: Austin, TX
I had a pinging problem right before an upshift, but super unleaded cured it. I just switched back to regular and it's back, but not as bad. I've been using super for over a year and with it at 2.37 I tried the reg. I think I'll give the computer reset a try(this will be the 6 millionth time). Like Fred said the heat sheild on the exhaust can rattle. Look for broken welds, I used ss hose clamps on mine.
