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Author
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Topic: 390 gears noisy?
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Mach916
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Member # 8264
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posted
 
jaws gear said they wont garantee that motive 390s will be quiet..they said its just a noisy gear? is that possible?but 373 motives they will..wtf?
Posts: 1247 | From: Sacramento | Registered: Mar 2008
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50DADDY
CAFords OG
Member # 3076
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posted
Yeah,something about the tooth count and cut on 3;90's makes em noisy.I faced the same dilema and went with 4;10's.They howl a little too though,no biggie.
[ May 04, 2011, 04:31 PM: Message edited by: 50DADDY ]
Posts: 4827 | From: Suckramento | Registered: Jul 2003
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
Not that it relates, but my Motive 3.90s definitely howled...
I'm skeptical that it is due to brand or tooth count however, but who knows.
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by Luke87GT:
Not that it relates, but my Motive 3.90s definitely howled...
I'm skeptical that it is due to brand or tooth count however, but who knows.
do your 430's make noise?
my old 430's were loud as fuck, but I think they were just installed badly.
I have a ford racing 430 gear set and swap kit waiting to go into my irs but I can't bring myself to mess with it when the rearend works perfect and doesn't make any noise...but I miss the 'torque'!
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Mach916
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Member # 8264
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posted
quote:
Originally posted by 50DADDY:
Yeah,something about the tooth count and cut on 3;90's makes em noisy.I faced the same dilema and went with 4;10's.They howl a little too though.
yea ive heard this too but im skeptical like luke too.. and ring is a ring.. i can see if it was going on a extream one way or another but 390s are in the middle... who did your install??
Posts: 1247 | From: Sacramento | Registered: Mar 2008
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Mach916
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Member # 8264
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posted
quote:
Originally posted by Luke87GT:
Not that it relates, but my Motive 3.90s definitely howled...
I'm skeptical that it is due to brand or tooth count however, but who knows.
how bad did they howl??
Posts: 1247 | From: Sacramento | Registered: Mar 2008
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racsirx
CAFords OG
Member # 1710
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posted
I had 4:10s and 4:30s and I didn't have a problem, but I knew that there was a chance they could
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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Jaejae5.0
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Member # 7958
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posted
everytime i hear howl..its usually a gear set other than ford racing.. ![[patriot]](graemlins/patriot.gif)
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1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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Vndcatr
CAFords OG
Member # 2343
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posted
Ive had motive 3.73s and Motive 4.10s. Both by Jaws and both had Minor howl from 55-65mph in my cammed ws6, but wasnt louder than my valvetrain noise.
I have heard 3.90s were loud, but i didnt buy a Mercedes...
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Built 01 cobra
400 rwhp
11.7@117mph , 1.62 60ft
Posts: 1066 | From: Sacramento,Ca | Registered: Jan 2003
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
quote:
Originally posted by Mach916:
quote:
Originally posted by Luke87GT:
Not that it relates, but my Motive 3.90s definitely howled...
I'm skeptical that it is due to brand or tooth count however, but who knows.
how bad did they howl??
It was pretty bad at part throttle between. I actually didn't realize how bad it was until I sold the car and got another Mustang that was a lot quieter.
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
quote:
Originally posted by Blind:
quote:
Originally posted by Luke87GT:
Not that it relates, but my Motive 3.90s definitely howled...
I'm skeptical that it is due to brand or tooth count however, but who knows.
do your 430's make noise?
my old 430's were loud as fuck, but I think they were just installed badly.
I have a ford racing 430 gear set and swap kit waiting to go into my irs but I can't bring myself to mess with it when the rearend works perfect and doesn't make any noise...but I miss the 'torque'!
My FMS 4.30s are pretty quiet in comparison with my old Motive 3.90s.
I had a different problem other than noise though. For some reason the machining tolerances on the splines of the 4.30 pinion gear were really loose and it was not a snug fit on the pinion flange resulting in a pretty bad leak through the splines. I had to zip off the pinion nut, hit it was some RTV, and it's been dry for over a year of daily driving now. No adverse driving effects either... go figure.
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by Luke87GT:
quote:
Originally posted by Blind:
quote:
Originally posted by Luke87GT:
Not that it relates, but my Motive 3.90s definitely howled...
I'm skeptical that it is due to brand or tooth count however, but who knows.
do your 430's make noise?
my old 430's were loud as fuck, but I think they were just installed badly.
I have a ford racing 430 gear set and swap kit waiting to go into my irs but I can't bring myself to mess with it when the rearend works perfect and doesn't make any noise...but I miss the 'torque'!
My FMS 4.30s are pretty quiet in comparison with my old Motive 3.90s.
I had a different problem other than noise though. For some reason the machining tolerances on the splines of the 4.30 pinion gear were really loose and it was not a snug fit on the pinion flange resulting in a pretty bad leak through the splines. I had to zip off the pinion nut, hit it was some RTV, and it's been dry for over a year of daily driving now. No adverse driving effects either... go figure.
by 'pretty quiet' that means you can hear them on the freeway doesn't it
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
quote:
Originally posted by Blind:
quote:
Originally posted by Luke87GT:
quote:
Originally posted by Blind:
quote:
Originally posted by Luke87GT:
Not that it relates, but my Motive 3.90s definitely howled...
I'm skeptical that it is due to brand or tooth count however, but who knows.
do your 430's make noise?
my old 430's were loud as fuck, but I think they were just installed badly.
I have a ford racing 430 gear set and swap kit waiting to go into my irs but I can't bring myself to mess with it when the rearend works perfect and doesn't make any noise...but I miss the 'torque'!
My FMS 4.30s are pretty quiet in comparison with my old Motive 3.90s.
I had a different problem other than noise though. For some reason the machining tolerances on the splines of the 4.30 pinion gear were really loose and it was not a snug fit on the pinion flange resulting in a pretty bad leak through the splines. I had to zip off the pinion nut, hit it was some RTV, and it's been dry for over a year of daily driving now. No adverse driving effects either... go figure.
by 'pretty quiet' that means you can hear them on the freeway doesn't it
Barely... It's not something I'd even think twice about. On my previous car you couldn't miss it.
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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19mystic96
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Member # 7553
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posted
Had jaws gear install 4.30s in my mustang 8.8.. Howled like a mofo.. Eventually started leaking from both axle seals..
Had rear end specialties install 4.56s in my ranger 8.8.. Makes absolutely no noise at all..
Last place I would go again for gear installs is Jaws Gear..
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1996 Mystic cobra #32
Posts: 1287 | From: Pacifica | Registered: Apr 2007
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stangin'
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Member # 514
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posted
when possible, go with ford gears. it's been well documented that ford gears are less prone to rear-end whining. their gears are not necessary made by ford, but their manufacturing tolerance seems to be higher than other brands.
quality parts and a seasoned installer is the key to no gear whine.
Posts: 2993 | From: Bay Area | Registered: Oct 2001
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50 Deep
Jockin 03 Cobras
Member # 6216
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posted
Me and my buddies have always had a good experience with Jaws. The guys there have taken care of a few of my cars.
The 3.90 gears are an odd cut and the way/angle they mesh cause them to be noisier than most other gear sets. Its the reason why very few companies offer them since customers want quiet rear ends.
Posts: 6043 | From: sacramento | Registered: Nov 2005
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SLOWBACK 67
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Member # 6348
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posted
Where is John B? I think he should throw up his thoughts on this.
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Originally posted by turbo50:
I have no intenions of keeping anyones parts or taking anyones money.
Posts: 8582 | From: Vallejo | Registered: Dec 2005
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Mach916
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Member # 8264
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posted
quote:
Originally posted by 19mystic96:
Had jaws gear install 4.30s in my mustang 8.8.. Howled like a mofo.. Eventually started leaking from both axle seals..
Had rear end specialties install 4.56s in my ranger 8.8.. Makes absolutely no noise at all..
Last place I would go again for gear installs is Jaws Gear..
what fluid did you put in with each gear set?? jaws blamed synthetic fluid for the extra noise with my 430s.
Posts: 1247 | From: Sacramento | Registered: Mar 2008
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Just_a_GT
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Member # 10372
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posted
how loud is some of your guys howl. would it be noticable over my exhaust, its pretty loud. im sure mine dont howl ive got 4.10 ford racing gears. i am just curious as to how loud the howl would be on noisy gears, my guess is some make more noise than others right????????
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1990 GT 308 edelbrock alum heads Daily driver
2000 GT CAMMED 281ci
Posts: 697 | From: Winton, CA | Registered: Oct 2010
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DevonShelbyGT
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Member # 8696
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posted
quote:
Originally posted by 19mystic96:
Had jaws gear install 4.30s in my mustang 8.8.. Howled like a mofo.. Eventually started leaking from both axle seals..
Had rear end specialties install 4.56s in my ranger 8.8.. Makes absolutely no noise at all..
Last place I would go again for gear installs is Jaws Gear..
+1
Posts: 299 | From: Sacramento, CA | Registered: Oct 2008
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Pumpkin_Notch
TEAM PLATINUM
Member # 3946
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posted
I got my coupe with 373's and they howl like a mofo 68-70 mph
[ May 05, 2011, 11:15 AM: Message edited by: 94 N.C.F. GT ]
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TEAM PLATINUM
87LX: T-TOP PUMPKIN NOTCH
94N.C.F.GT: 418w
www.facebook.com/PLATINUM1320tv
Posts: 2790 | From: RICHMOND/sanpablo | Registered: Dec 2003
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RED@7kVERT *8850GT*
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Member # 5909
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posted
FMS 4.30's in my 01'
Quiet as stock....
Mobil 1 synthetic, OEM weight.
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02 Z06-11.0 @ 132 1.9 60'
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Sold:05 CTS-V-13.1@114
Sold:01 Cobra Vert-12.0@119
Posts: 2432 | From: -916- | Registered: Aug 2005
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by RED@7kVERT *8850GT*:
FMS 4.30's in my 01'
Quiet as stock....
Mobil 1 synthetic, OEM weight.
good to hear!
the FMS 3.73's in my `89 are quiet as stock, my old SRA in the `97 had motive 4.30's I believe and it was very loud on the freeway.
Who installed the gears in your 01?
now that I know it's possible to have quiet gears it makes me more ready to throw the FMS 4.30 kit into my IRS.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Chavez66
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Member # 9812
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posted
my 4.30's are quite and had Jaws work on ma cobra and rebuilt my rear end on ma 66 with 3.55 gears and they make no noise at all
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WWW.50Reasonscarclub.com
Posts: 1694 | From: Dont worry about it | Registered: Feb 2010
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