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#946870 - 03/08/11 11:28 PM Spool. Ok for the street?
Anonymous
Unregistered


I have a friend going through his 489 case 8 3/4 axle and he is tossing around the idea of using a full spool instead of a sure grip differential. He asked my advice, but since I have never driven a car with a spool or had any expereince with them, I didnt have any sound advice to give him. What do you guys think? His car is a 1969 road runner with a potent 500 incher and it sees some drag use and street use. Probably a low 11 second car if he could ever hook it up

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#946871 - 03/08/11 11:41 PM Re: Spool. Ok for the street? [Re: ]
BulletBob Offline
master

Registered: 10/20/05
Posts: 5995
Loc: Back home in PA
What's he doing with an 8 3/4 and 500 cubes?

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#946872 - 03/08/11 11:42 PM Re: Spool. Ok for the street? [Re: ]
Randy.. Offline
super stock

Registered: 07/10/10
Posts: 790
Loc: Bama
last 5 or 6 cars ive owned have all had spools, 1 small block all the rest big block. current car a 67 Belvedere with a 440 has a 8 3/4 3.91 with a spool, never a problem even in rain just use your head.

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#946873 - 03/09/11 01:47 AM Re: Spool. Ok for the street? [Re: ]
Doc Fiberglass Offline
I Live Here

Registered: 07/04/08
Posts: 18017
Loc: ...to Paradise from ParaICE !
From what I have heard(no personal actual experience) ... the taller the tire with a more flexible sidewall is a better combo with a spool.
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#946874 - 03/09/11 02:23 AM Re: Spool. Ok for the street? [Re: BulletBob]
Frankenduster Offline
Moparts proctologist

Registered: 02/15/10
Posts: 15582
Loc: Granite Bay CA
Quote:

What's he doing with an 8 3/4 and 500 cubes?




Hey... I have an 8 3/4 in the Charger... 493, 10.8 to one....The rear end is still holding on!

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#946875 - 03/09/11 07:39 AM Re: Spool. Ok for the street? [Re: ]
Challenger 1 Offline
Too Many Posts

Registered: 02/05/05
Posts: 28304
Loc: Cincinnati, Ohio
No, it's not OK imo. Put's a lot stress on the axles and makes for a dangerous ride.

Those who say spool is OK for the street don't drive there car's much. My
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#946876 - 03/09/11 08:14 AM Re: Spool. Ok for the street? [Re: Challenger 1]
MoparforLife Offline
Too Many Posts

Registered: 01/19/03
Posts: 25199
Loc: Upper Midwest
Quote:

No, it's not OK imo. Put's a lot stress on the axles and makes for a dangerous ride.

Those who say spool is OK for the street don't drive there car's much. My



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#946877 - 03/09/11 09:03 AM Re: Spool. Ok for the street? [Re: Doc Fiberglass]
Charger727 Offline
super stock

Registered: 01/21/03
Posts: 993
Loc: Eau Claire, WI
Quote:

From what I have heard(no personal actual experience) ... the taller the tire with a more flexible sidewall is a better combo with a spool.




Exactly

My Dana60 with big Hoosiers - no problem

I just bought a car with 8.75, spool with small hard tires - one shaft twisted into a pretzel

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#946878 - 03/09/11 09:58 AM Re: Spool. Ok for the street? [Re: Charger727]
redmist Offline
enthusiast

Registered: 11/25/07
Posts: 305
Loc: 5th and plum
I drive a spooled jeep on the road, but it has a 14 bolt rear, and 40" tall tires..

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#946879 - 03/09/11 10:12 AM Re: Spool. Ok for the street? [Re: redmist]
Challenger 1 Offline
Too Many Posts

Registered: 02/05/05
Posts: 28304
Loc: Cincinnati, Ohio
Quote:

I drive a spooled jeep on the road, but it has a 14 bolt rear, and 40" tall tires..




There's no sense in telling people how foolish you are.

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#946880 - 03/09/11 11:18 AM Re: Spool. Ok for the street? [Re: Challenger 1]
StealthWedge67 Offline
master

Registered: 07/19/06
Posts: 4155
Loc: Puyallup, WA
The real question is "Why?". If its primarily a race care that's gonna see the street now and then, I'd say okay. But for a street car that's gonna see some track time, I think a properly setup sure-grip is the best way to go.

Either way, A spool should never be used without also upgrading the Axles and wheel studs, as it will put a lot of pressure on these components. A spool with stock axles on the street is a big BANG waiting to happen.
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#946881 - 03/09/11 11:49 AM Re: Spool. Ok for the street? [Re: StealthWedge67]
stumpy Offline


Registered: 01/19/03
Posts: 29639
Loc: Grand Prairie,Texas
If you don't mind the rearend hopping around corners go for it. I did it on one car and never will again for street use.

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#946882 - 03/09/11 12:05 PM Re: Spool. Ok for the street? [Re: stumpy]
MoparforLife Offline
Too Many Posts

Registered: 01/19/03
Posts: 25199
Loc: Upper Midwest
Quote:

If you don't mind the rearend hopping around corners go for it. I did it on one car and never will again for street use.


That along with it being a bear to park, and the back end trying to pass you if it is slightly wet on the street. It is a dangerous thing to do but if you have good insurance and don't give a rip for any ones safety - go for it.
Just because some say that they do it and that it isn't a problem doesn't mean that it is a real smart move.

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#946883 - 03/09/11 12:45 PM Re: Spool. Ok for the street? [Re: MoparforLife]
Yancy Derringer Offline
mopar

Registered: 10/20/10
Posts: 606
Loc: Montana
All you need to do is see this ONCE.


Fairly hard launch (stop light), broken axle, and lots of tire.

Result? INSTANT turn to one side or the other.

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#946884 - 03/10/11 03:00 AM Re: Spool. Ok for the street? [Re: Yancy Derringer]
ProStDodge Offline
master

Registered: 12/20/03
Posts: 2575
Loc: Illinois, Indiana, Louisiana
Drove my 71 Charger on the street for years/many miles with a spool and 18.5" Hoosier QTP's. The car was driven often and raced when possible.

However, the ladder bar bracket fatigued and broke off the housing (not at the weld). Replaced and then boxed the brackets, also repaired/repainted both 1/4 panels.

About a year later, the tire broke off with the flange from the Mark Williams axle still attached. Replaced axle, wheel and brakes.

Anther two years later, the ladder bar cross member cracked and broke loose from the frame. New lader bars, and cross member, along with new 1/4 panel paint and repairs.

Were all of these problems due to the spool? Maybe not, but after changing to an electric locker, there were no more problems.

I will no longer run a spool regularly on the street with "sticky" tires.


Scott
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"Been there - Done that - probably more than once before getting it right"

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#946885 - 03/10/11 10:08 AM Re: Spool. Ok for the street? [Re: Challenger 1]
dangina Offline
pro stock

Registered: 11/19/08
Posts: 1424
Loc: Lethbridge, AB, Canada
Quote:

No, it's not OK imo. Put's a lot stress on the axles and makes for a dangerous ride.

Those who say spool is OK for the street don't drive there car's much. My




you wouldnt belive how many kids do it with thier imports nowadays - except they weld up the open diff which esentially like driving with a spool - easily 50 of them on the one forum im on - all daily drivers...

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#946886 - 03/10/11 10:22 AM Re: Spool. Ok for the street? [Re: dangina]
Challenger 1 Offline
Too Many Posts

Registered: 02/05/05
Posts: 28304
Loc: Cincinnati, Ohio
Quote:

Quote:

No, it's not OK imo. Put's a lot stress on the axles and makes for a dangerous ride.

Those who say spool is OK for the street don't drive there car's much. My




you wouldnt belive how many kids do it with thier imports nowadays - except they weld up the open diff which esentially like driving with a spool - easily 50 of them on the one forum im on - all daily drivers...




Well I really can't blame them, I'm glad there working on there cars and not computers.
I did the same thing one time, welded up my spider gears. I was about 20 years old and didn't have any money and wanted a sure grip.

This was after watching my mentor while I was learning mechanics from him, weldup many jeeps for sand racing. That's differnt than the street, but I bet plenty of them were used on the street.

But now that I know better and thought I would express my experience and recomend against it.

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#946887 - 03/10/11 10:27 AM Re: Spool. Ok for the street? [Re: Challenger 1]
1_WILD_RT Offline
Management Trainee

Registered: 01/15/04
Posts: 27347
Loc: Today? Who Knows?
I just looked & couldn't find the video of a beautiful 70 Torino Cobra at the track.. It's running a spool & breaks an axleat the launch... Talk about a violent left turn....
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#946888 - 03/10/11 01:22 PM Re: Spool. Ok for the street? [Re: 1_WILD_RT]
screamindriver Offline


Registered: 02/14/04
Posts: 7100
Loc: Harrisburg, Pa.
I have'nt seen it much the past few years but I always had to check for the welded up gears at the boneyard... The 8 3/4 was tough...Always exciting to find the sure-grip only to ... ...After you've spent the time to yank it out and find the welds...

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#946889 - 03/10/11 03:17 PM Re: Spool. Ok for the street? [Re: screamindriver]
galen Offline
super stock

Registered: 05/02/09
Posts: 755
Loc: Missouri
I am running a 9" 40 spline axles and a spool. I do not drive in wet weather and it wears out tires fast. I am chewing up MT drag radials every 2000 miles. I am swapping the center section and going with some type of posi unit before summer. They have some very nice units out now. Not to mention having to use a steering knob to park it.


Edited by galen (03/10/11 03:56 PM)

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#946890 - 03/10/11 05:32 PM Re: Spool. Ok for the street? [Re: galen]
1340busa Offline
member

Registered: 12/14/10
Posts: 42
Loc: georgia
i drive a 72 340 demon with 3.91 and 28 inch tall tires. it has a spool and moser axles. it is a everyday street car no problems. it has superstock springs and mini tubs. i love the spool.

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#946891 - 03/10/11 07:27 PM Re: Spool. Ok for the street? [Re: 1340busa]
Superfreak Offline
master

Registered: 11/08/08
Posts: 3654
Loc: the great wet north
I will be putting a Detroit locker in my street/ strip car.
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#946892 - 03/10/11 07:44 PM Re: Spool. Ok for the street? [Re: Superfreak]
Anonymous
Unregistered


Thanks for all the input guys. I am going to advise him to use a sure grip style diff. His car will see little track time.

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#946893 - 03/10/11 07:53 PM Re: Spool. Ok for the street? [Re: Challenger 1]
redmist Offline
enthusiast

Registered: 11/25/07
Posts: 305
Loc: 5th and plum
Quote:

Quote:

I drive a spooled jeep on the road, but it has a 14 bolt rear, and 40" tall tires..




There's no sense in telling people how foolish you are.




HUH???!?!?!

Foolish how?

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#946894 - 03/11/11 01:27 PM Re: Spool. Ok for the street? [Re: ]
an8sec70cuda Offline
I Live Here

Registered: 01/19/03
Posts: 10971
Loc: Marion, South Carolina [><]
Nothing wrong w/ a spool on the street. Rain or shine, doesn't matter about the spool. What does matter is the tires. Drag radials or street slicks are scary on wet pavement. Doesn't matter what differential you have if you're on tires w/ minimal tread and trying to drive on wet pavement.
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CHIP
'70 hemicuda...8.91 at 150.5 mph street car...Mopar Action feature Dec. '14
'69 road runner 440 w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'06 GMC 2500HD LBZ Duramax...toy hauler
'16 Grand Caravan SXT...baby hauler

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#946895 - 03/12/11 05:28 PM Re: Spool. Ok for the street? [Re: an8sec70cuda]
Mr. T Offline
super stock

Registered: 06/03/07
Posts: 1161
Loc: Mississippi
I went with a spool after my sure grip took a dump. I drive it on the street occasionally. I just make sure that I don't make any sharp turns around corners. It sort of comes naturally, after dragging 53' trailers around for the past 20 years.
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#946896 - 03/12/11 05:39 PM Re: Spool. Ok for the street? [Re: ]
not_a_charger Offline

Mr. Big Shot Moparts Moderator

Registered: 12/02/07
Posts: 14287
Loc: Puttin' on the foil in Charles...
The Scamp had a spool in it. I got caught in the rain once and it made me a little nervous, but otherwise, I didn't mind it. It chirped the tires around corners, but it also made me drive the care carefully. I probably wouldn't drive a spool-equipped street car by choice again, but I'm certainly not against them.

My CJ-7 has Detroits front and rear, though I keep the front hubs unocked on the street. With a 7 inch lift, 35 inch tires, and a short wheelbase, it can be squirrelly in the rain, which I try to avoid. Otherwise, the occasional "bang" from the locker is the only time I notice it on the street. On the trail, they're worth their weight in gold.
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