Previous Thread
Next Thread
Print Thread
Which gearsets are quieter nowadays, D60 or 8 3/4? #2706706
10/14/19 12:25 PM
10/14/19 12:25 PM
Joined: Jan 2003
Posts: 5,341
Benton, IL.
D
DaveRS23 Offline OP
master
DaveRS23  Offline OP
master
D

Joined: Jan 2003
Posts: 5,341
Benton, IL.
I have had 8 3/4s under my street/strip cars forever. I have only busted one or two over the years so overall durability in not an issue. My problem is that they are always quiet at first, but man do they get noisy after a few years. The 3.91s I have in there now have gotten so loud that I can hardly hear the radio over them. I pulled them out last winter and checked everything and it all looked good. I can usually get 4 or 5 years (less than 10,000 miles) before they get unbearably noisy. That is the situation now.

Now I have a truck D60 that I can cut down, flange and set-up for the Cuda. It will obviously cost more to do that than replace the ring and pinion in the present 8 3/4. The only real reason I would go to the time and expense of changing over to the Dana is if it were to stay quiet.

I hit the track with Drag Radials 2 or 3 times a year if that matters. Auto trans, 1.5/1.6 60's, 3,900lbs.

So my question is: are the gear sets for the Danas any quieter than the gear sets for the 8 3/4s over time? Any help and direction here would be appreciated. I have to do something with the rear gears this winter. I just need to decide which is the better route to quiet rear gears over the years.


KOS
Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: DaveRS23] #2706770
10/14/19 04:15 PM
10/14/19 04:15 PM
Joined: Sep 2017
Posts: 58
NW Illinois
M
MoonshineMattK Offline
member
MoonshineMattK  Offline
member
M

Joined: Sep 2017
Posts: 58
NW Illinois
I think there must be something wrong if your axle is noisy. The 8 3/4 in my charger has well over 25,000 miles since the early 2000's and has been quiet the whole time.

Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: DaveRS23] #2706783
10/14/19 05:38 PM
10/14/19 05:38 PM
Joined: Aug 2003
Posts: 33,583
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 33,583
Bend,OR USA
Your having luck I never had, none of the good 8 3/4 gear sets I had set up by a good shop never made noise, even after cracking the outer edge of the ring gear teeth on every tooth work shruggy I would pull them on the race cars after 100 runs to check them, I had one tooth corner break off at the track in the burn out box and ruin that day. None broken while driving them after that by replacing them before the corners broke off work
I bent the heck out of the last 8 3/4 housing I had cut down to put in my old pump gas Duster street car that was half fast, 10.0 at 134. MPH corked up on pump Oregon 91 octane swill motor only with the air cleaner on devil I replaced it with a cut down Dana 60 out of a pickup and the car pushed so much easier after that I wish I had put a good Dana 60 in it to start with up twocents
I had tried 4 different gear sets in that 8 3/4 before breaking the ladder bar tabs off of the housing at Woodburn drag strip in around 2008 or 2009, 3:73,3:91, 3:91,4:10 and the final set of 4.30. That stupid car ran almost the same ET and MPH no matter what gear set was in the rear end confused I cracked the corners on all of the ring gears also whiney That rear end had a set of Strange 35 spline axles and a strange Engr. 35 spline spool in the 8 3/4 since day one also work
The stock set of Dana 60 4.10 gears are still in that car going strong, same thing on the stock Dana 4.56 gear set in my current S/P car up I had the rear cover off last year after a bunch of runs and they looked great, no noise or ring gear cracks boogie
IHThs thumbs


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: DaveRS23] #2706905
10/15/19 01:24 AM
10/15/19 01:24 AM
Joined: May 2008
Posts: 5,197
Aurora, Colorado
451Mopar Offline
master
451Mopar  Offline
master

Joined: May 2008
Posts: 5,197
Aurora, Colorado
When my 4,150# Charger was running the 11's the limited slip of the stock 3.91:1 geared 741 case 8-3/4" started making bad noises.
After looking at options and costs to upgrade the 8-3/4", I just put in a Strange S-60 with 4.10:1 spool in the car.
I was going to say if it is a 489 Case 8-3/4", replace the crush sleeve with the solid spacer adaptor and shim package.

Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: DaveRS23] #2706940
10/15/19 09:17 AM
10/15/19 09:17 AM
Joined: Aug 2005
Posts: 5,001
at work
Grizzly Offline
master
Grizzly  Offline
master

Joined: Aug 2005
Posts: 5,001
at work
You are not alone.

Every 8.75 diff I've ever owned roared at highway speed. Probably pinion bearing, I just live with it because I drive them so little, but hate it just as much as you do.

I've been waiting for someone to upload a Youtube video of how to do a full re-build of the 8.75 so I can know how to do one, but still no one has done it.

The 9.25's in the Rams are only a bit better but, same thing: pinion bearing replacement is required reading for a Dodge Owner.

The Dana that was in my diesels I didn't own long enough to comment, but I sure don't hear the 2500/3500 Owners complaining about them, so you might be on the right track with going the Dana route.

Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: Grizzly] #2706970
10/15/19 11:09 AM
10/15/19 11:09 AM
Joined: Aug 2003
Posts: 33,583
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 33,583
Bend,OR USA
I believe all the Cummins powered pickup had Dana 70 in the 3/4 tons and Dana 80 in the one tons up through 2004 when ma Mopar switch vendors to the cheaper American Brand rear ends down


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: Grizzly] #2707065
10/15/19 04:20 PM
10/15/19 04:20 PM
Joined: Sep 2017
Posts: 58
NW Illinois
M
MoonshineMattK Offline
member
MoonshineMattK  Offline
member
M

Joined: Sep 2017
Posts: 58
NW Illinois
Factory service manual has pretty good step by step instructions. My biggest challenge was understanding how pinion depth and ring gear offset effected the gear pattern. 742 uses shims to set pinion bearing preload from the factory. When I do a 489 case I use a kit to eliminate the crush sleeve.

Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: MoonshineMattK] #2707117
10/15/19 08:53 PM
10/15/19 08:53 PM
Joined: Nov 2004
Posts: 24,812
Texas
GoodysGotaCuda Offline
5.7L Hemi, 6spd
GoodysGotaCuda  Offline
5.7L Hemi, 6spd

Joined: Nov 2004
Posts: 24,812
Texas
I have Motive [Richmond] gears in my 489 case and however I set them up is too noisy for my liking. They're quiet as long as I am accelerating or under load but begin to get quite loud on light load/decel.

I may have to go back into the diff this Winter and try to make some adjustments.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
1976 Dodge Warlock - "Her Truck" - 360/727 2wd
2016 Subaru WRX - E30 Tune ~320whp
[img]https://i.imgur.com/v9yezP9.jpg[/img]
Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: GoodysGotaCuda] #2707155
10/16/19 01:38 AM
10/16/19 01:38 AM
Joined: Aug 2019
Posts: 5
CA
E
ericxnelson Offline
member
ericxnelson  Offline
member
E

Joined: Aug 2019
Posts: 5
CA
I appreciate all the honest responses here. My 3.91's in the dart were always noisy af, and have been on the fence over upgrading but this makes me lean towards just going all in on an s60.

Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: GoodysGotaCuda] #2707202
10/16/19 08:07 AM
10/16/19 08:07 AM
Joined: Jan 2003
Posts: 5,341
Benton, IL.
D
DaveRS23 Offline OP
master
DaveRS23  Offline OP
master
D

Joined: Jan 2003
Posts: 5,341
Benton, IL.
Originally Posted by GoodysGotaCuda
I have Motive [Richmond] gears in my 489 case and however I set them up is too noisy for my liking. They're quiet as long as I am accelerating or under load but begin to get quite loud on light load/decel.

I may have to go back into the diff this Winter and try to make some adjustments.


Sounds similar to mine. Quiet under load and under full decel. But VERY noisy in between. Makes cruising a pain and makes me want to just race all the time. biggrin


KOS
Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: DaveRS23] #2707263
10/16/19 11:30 AM
10/16/19 11:30 AM
Joined: Sep 2003
Posts: 11,859
north of coder
moparx Offline
Dreaming of implants
moparx  Offline
Dreaming of implants

Joined: Sep 2003
Posts: 11,859
north of coder
goody, once the gears are run in for a while, i don't think you will get rid of the noise by re-adjusting them.
i have been wrong many times.
beer

Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: moparx] #2707347
10/16/19 06:00 PM
10/16/19 06:00 PM
Joined: Jan 2011
Posts: 4,660
Utah and Alaska
astjp2 Offline
master
astjp2  Offline
master

Joined: Jan 2011
Posts: 4,660
Utah and Alaska
Real dana spicer gears set up properly are as quiet as a Lincoln or Cadillac...


1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!
Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: astjp2] #2707352
10/16/19 06:10 PM
10/16/19 06:10 PM
Joined: Jan 2003
Posts: 5,341
Benton, IL.
D
DaveRS23 Offline OP
master
DaveRS23  Offline OP
master
D

Joined: Jan 2003
Posts: 5,341
Benton, IL.
Originally Posted by astjp2
Real dana spicer gears set up properly are as quiet as a Lincoln or Cadillac...


Okay. Now where do I get them?


KOS
Re: Which gearsets are quieter nowadays, D60 or 8 3/4? [Re: DaveRS23] #2707378
10/16/19 07:13 PM
10/16/19 07:13 PM
Joined: Jan 2003
Posts: 14,035
So Near, Yet So Far
topside Offline
I Live Here
topside  Offline
I Live Here

Joined: Jan 2003
Posts: 14,035
So Near, Yet So Far
Last gearset I had that whined on decel was a pinion depth issue. Loud enough that it was obvious there was a problem.
Pulled the diff out and it was WAY off, had pretty much eaten the R&P.
I've also had a 130,000-mile untouched-original Road Runner 8.75 that had a slight whine pretty much all its life on the freeway, steady speed, but most of the 20 or so 8.75s I've had were quiet.
My Danas have all been quiet, whether they were street cars or drag cars.
Gearsets came from different sources.


Advertisement
Sponsored Link
Moparts Newest Topics
2014 Saleen Challenger
by Neil. 11/13/19 11:01 AM
1971 Cuda Option Costs?
by lrtexpress. 11/13/19 10:42 AM
Ever seen eBarf ads "disappear" w/o a trace?
by BradH. 11/13/19 10:38 AM
SST Releases The New A41X For 4WD Applications
by Rustymuscle. 11/13/19 10:24 AM
Moparts Recent Posts
"Early Retirement Packages"... any takers?
by rocksmopar. 11/13/19 02:32 PM
Big Chief
by CMcAllister. 11/13/19 02:28 PM
WIW 70 duster set up for BB?
by topside. 11/13/19 02:22 PM
Stu Harmon General Forum
by 69_SIX_PACK. 11/13/19 02:18 PM

Powered by UBB.threads™ PHP Forum Software 7.7.1