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Will a 8 3/4 Live?
#1548237
12/16/13 11:33 AM
12/16/13 11:33 AM
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Joined: Jan 2003
Posts: 2,155
Tucson, Arizona
clonestocker
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,155
Tucson, Arizona
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My son's making changes to his 67 Dart. He will eventually be going to a Gen3 Hemi w/Mods. This is a street car. He will be running Cal Tracs, TKO 600 5 spd and will use a 27 x10.5 ET Street tire. He was told to put a Back Brace on it and it will use a clutch posi. Opinions please. thx matt
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Re: Will a 8 3/4 Live?
[Re: clonestocker]
#1548239
12/16/13 11:40 AM
12/16/13 11:40 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
My son's making changes to his 67 Dart. He will eventually be going to a Gen3 Hemi w/Mods. This is a street car. He will be running Cal Tracs, TKO 600 5 spd and will use a 27 x10.5 ET Street tire. He was told to put a Back Brace on it and it will use a clutch posi. Opinions please. thx matt
I ran my race car with a stock 8 3/4 with a posi
and it lasted 600 passes... but the car was light
leaving at 5000+ rpm.... if he puts the back brace
and the carrier cap or caps it would be fine for a
long time... weight is what kills them
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Re: Will a 8 3/4 Live?
[Re: Cab_Burge]
#1548241
12/16/13 01:04 PM
12/16/13 01:04 PM
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Joined: Dec 2006
Posts: 1,178
Indy
FlyFish
super stock
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super stock
Joined: Dec 2006
Posts: 1,178
Indy
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After putting Caltracs on my car (stroked small block, 5k converter), it crushed the axle tubes at the spring perches on my 8 3/4. I switched the housing out for a Moser MO875 fabricated housing with a back brace...everything has been great since. This is on my 3200# Barracuda street/strip car that runs mid 10's.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
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Re: Will a 8 3/4 Live?
[Re: BradH]
#1548243
12/16/13 01:46 PM
12/16/13 01:46 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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www.doctordiff.comTake all the $ you were going to spend on back bracing, nodular or billet caps, etc and just buy a D60. You'll only have to do it once. R.
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Re: Will a 8 3/4 Live?
[Re: FlyFish]
#1548244
12/16/13 01:47 PM
12/16/13 01:47 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
... I switched the housing out for a Moser MO875 fabricated housing with a back brace...
I looked at one of those, too, but started thinking putting any more money into an 8.75" setup was simply taking money away from what it would cost to upgrade to a Dana 60.
If I came across one cheap enough, I'd probably try it. But at the price I recall them selling for, it was a tough sell.
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Re: Will a 8 3/4 Live?
[Re: MR_P_BODY]
#1548246
12/16/13 02:28 PM
12/16/13 02:28 PM
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Joined: May 2003
Posts: 1,751
Graham, WA
Polarapete
top fuel
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top fuel
Joined: May 2003
Posts: 1,751
Graham, WA
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The 8 3/4 in your son's '67 Dart has several things going for it. 1) the '67 is one of the lightest A-bodies 2) the tires he wants to use are going to be a limiting factor in terms of bite and therefore stress 3) this is supposed to be a "street car" and banzai launches should not be every launch particularly if he wants to keep his license 4) since he is using a stick, even if he breaks the rear he won't have 727 parts coming through the floor from a rolled sprag  That being said, I am a real beleiver in the brute strength of the Dana 60 when needed. I have never raced with anything else and never will 
1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction
1998 Ram 2500 QuadCab, new daily driver.
2008 Honda Element
2014 Carry-On 7x14 Cargo Trailer
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Re: Will a 8 3/4 Live?
[Re: BradH]
#1548247
12/16/13 05:07 PM
12/16/13 05:07 PM
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Joined: Dec 2006
Posts: 1,178
Indy
FlyFish
super stock
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super stock
Joined: Dec 2006
Posts: 1,178
Indy
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Quote:
Quote:
... I switched the housing out for a Moser MO875 fabricated housing with a back brace...
I looked at one of those, too, but started thinking putting any more money into an 8.75" setup was simply taking money away from what it would cost to upgrade to a Dana 60.
If I came across one cheap enough, I'd probably try it. But at the price I recall them selling for, it was a tough sell.
Yeah, just the housing is not too expensive. I actually got a heck of a deal on mine because they had one that was special ordered and the customer backed out. Instead of scrapping it, they offered it to me for a much reduced price (since it was not exactly what I had asked for)...all I had to do was a little cutting and welding to make it fit. For me, it was much cheaper than going to a Dana (I could use my axles and pumpkin), but I know someday I might have to make the switch...but I think I'll be safe since I foot-brake.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
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Re: Will a 8 3/4 Live?
[Re: Biginchmopar]
#1548249
12/16/13 05:43 PM
12/16/13 05:43 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
It will break - PERIOD!!!
I guess I better sell my 8 3/4... its only been
1.19 60'... with BIG slicks... but the car is light,
with the street tires(even the MT EZ Streets) its
gonna have some spin.... but I guess there is plenty
on here that cant build a diff... dont dead hook
ANY car.... you will also notice that you dont see
the guys saying they blow the D60s... and they do
on a regular basis
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Re: Will a 8 3/4 Live?
[Re: MR_P_BODY]
#1548252
12/16/13 07:21 PM
12/16/13 07:21 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
It will break - PERIOD!!!
I guess I better sell my 8 3/4... its only been
1.19 60'... with BIG slicks... but the car is light,
with the street tires(even the MT EZ Streets) its
gonna have some spin.... but I guess there is plenty
on here that cant build a diff... dont dead hook
ANY car.... you will also notice that you dont see
the guys saying they blow the D60s... and they do
on a regular basis
Mike you are not doing an equal comparison, you have a after market aluminum housing a light car and not a bunch of power.
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Re: Will a 8 3/4 Live?
[Re: Quicktree]
#1548253
12/16/13 07:29 PM
12/16/13 07:29 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
It will break - PERIOD!!!
I guess I better sell my 8 3/4... its only been
1.19 60'... with BIG slicks... but the car is light,
with the street tires(even the MT EZ Streets) its
gonna have some spin.... but I guess there is plenty
on here that cant build a diff... dont dead hook
ANY car.... you will also notice that you dont see
the guys saying they blow the D60s... and they do
on a regular basis
Mike you are not doing an equal comparison, you have a after market aluminum housing a light car and not a bunch of power.
Tony I made 600+ passes on a STOCK 8 3/4 with just
a back brace... that was with 550hp in a heavier
car than now by about 250# so that was close to 2700#
and EVERY pass was off the trans brake
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Re: Will a 8 3/4 Live?
[Re: Quicktree]
#1548254
12/16/13 07:29 PM
12/16/13 07:29 PM
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Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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Quote:
Quote:
Quote:
It will break - PERIOD!!!
I guess I better sell my 8 3/4... its only been
1.19 60'... with BIG slicks... but the car is light,
with the street tires(even the MT EZ Streets) its
gonna have some spin.... but I guess there is plenty
on here that cant build a diff... dont dead hook
ANY car.... you will also notice that you dont see
the guys saying they blow the D60s... and they do
on a regular basis
Mike you are not doing an equal comparison, you have a after market aluminum housing a light car and not a bunch of power.
I'd bet he makes more than the O.P. is planning on.
Like he said......weight kills them.
Add a stick and I would not consider an 8 3/4.
Add up a cap or caps , decent case , back brace and I have to agree that a Dana is a better alternative.
But done correctly , an 8 3/4 can survive within certain parameters.
My gut feeling is a heavy car that makes some oats or a stick shift that hooks would be outside of those.
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Re: Will a 8 3/4 Live?
[Re: Quicktree]
#1548255
12/16/13 07:31 PM
12/16/13 07:31 PM
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Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
Biginchmopar
pro stock
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pro stock
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
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I don't want to hurt fealings or step on toes but with his set-up IT WILL BREAK! Any diff can break with enough abuse. I speak from experience 3800lbs 69 Roadrunner with a 10" slick, 5 speed, Cal-Tracs, around 650lbs/ft torque. I have broke axles, bent things on a Dana 60. The 8 3/4 would have destoyed it self long, long ago. 
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Re: Will a 8 3/4 Live?
[Re: Biginchmopar]
#1548256
12/16/13 07:34 PM
12/16/13 07:34 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
I don't want to hurt fealings or step on toes but with his set-up IT WILL BREAK!
Any diff can break with enough abuse.
I speak from experience 3800lbs 69 Roadrunner with a 10" slick, 5 speed, Cal-Tracs, around 650lbs/ft torque. I have broke axles, bent things on a Dana 60. The 8 3/4 would have destoyed it self long, long ago.
 I wouldn't recommend an 8-3/4 to anyone but everybody knows that. 
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)ring and pinions, blew a clutch type posi unit completely apart 
, twisted axles and so on with a basically stock 340 pump gas motor stick shift car years ago in a very lightweight Duster, 2750 lbs without the driver 
He switched to a Dana 60 with 35 spline axles and posi and never had another problem with rear ends 
I would go to the Dana 60 now and not look back 
