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8.75 or 9" Rear?
#490476
10/07/09 09:23 AM
10/07/09 09:23 AM
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Joined: May 2005
Posts: 84
NC
Badfish67
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Posts: 84
NC
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My car is all Mopar and I hate the thought of putting a 9" rear in it, but i'm about to back half the Barracuda and everyone is telling me to go with a 9" rear. Can I hear from some of the back halfed guys that run sub 10's please.
1967 Barracuda
360ci/727
9.723ET @139.44mph
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Re: 8.75 or 9" Rear?
[Re: Badfish67]
#490478
10/07/09 09:27 AM
10/07/09 09:27 AM
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Joined: Jan 2003
Posts: 10,027
MN
JERICOGTX
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,027
MN
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No way I would consider a 8 3/4 on a back half car. Hook hard one time, and it will spit the ring gear, pinion gear, and main caps out in one shot. Don't waste your time with one.
Jeff
69 GTX
68 Road Runner
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Re: 8.75 or 9" Rear?
[Re: JERICOGTX]
#490479
10/07/09 09:35 AM
10/07/09 09:35 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
No way I would consider a 8 3/4 on a back half car. Hook hard one time, and it will spit the ring gear, pinion gear, and main caps out in one shot. Don't waste your time with one.
Jeff
You might be right..lol My first all out pass in a mild 440 and 6psi of boost exploded the ring/pinion and caps into a thousand pieces. To the rears credit it was 30something uears old and had at least 200 runs on it.
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Re: 8.75 or 9" Rear?
[Re: Mr.Yuck]
#490480
10/07/09 09:44 AM
10/07/09 09:44 AM
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Joined: Jan 2003
Posts: 10,027
MN
JERICOGTX
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,027
MN
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With a 8 3/4 it's not a matter IF it will break, it's a matter of WHEN??? Why risk it. Install a 9" in it right from the start.
Jeff
69 GTX
68 Road Runner
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Re: 8.75 or 9" Rear?
[Re: Mr.Yuck]
#490481
10/07/09 09:45 AM
10/07/09 09:45 AM
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Joined: May 2005
Posts: 84
NC
Badfish67
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NC
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Yea, if I go with a 9" it will be a fabricated housing that my chassis guy builds. I'll be running some big tires and spraying some NOS too.
1967 Barracuda
360ci/727
9.723ET @139.44mph
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Re: 8.75 or 9" Rear?
[Re: Badfish67]
#490483
10/07/09 09:52 AM
10/07/09 09:52 AM
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Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
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Do not waste your time with the 8 3/4. Get a 9" and be done with it.  CHIP
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: 8.75 or 9" Rear?
[Re: an8sec70cuda]
#490484
10/07/09 09:56 AM
10/07/09 09:56 AM
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Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
Do not waste your time with the 8 3/4. Get a 9" and be done with it. CHIP
8 3/4 rears are fine for stock eliminator and street guys but, really, most serious racers use some aftermarket version of the Ford 9"-and they do it for a reason.
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Re: 8.75 or 9" Rear?
[Re: Badfish67]
#490485
10/07/09 10:15 AM
10/07/09 10:15 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 car is all Mopar and I hate the thought of putting a 9" rear in it, but i'm about to back half the Barracuda and everyone is telling me to go with a 9" rear. Can I hear from some of the back halfed guys that run sub 10's please.
Like I always say... weight is the killer... if you
believe the car will be light then the 8 3/4 will work
fine.... I've been running the 8 3/4 for YEARS... I did
break the first one after 600+ passes...
BUT my car is LIGHT... but I have had a best 60' of 1.19
with my lowly 8 3/4... now I run the alum center
for it... much stronger... the one I broke was completely
stock except for the 4.88 gear(the first 2 years it
had the stock cone style posi). If you think the car
will be heavy... go a different direction... JMO
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Re: 8.75 or 9" Rear?
[Re: 68valiant68]
#490487
10/07/09 11:13 AM
10/07/09 11:13 AM
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Joined: May 2005
Posts: 84
NC
Badfish67
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NC
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The Dana 60 is out because of the weight and changing gears are a pain in the butt. I race 1/8 and 1/4 so changing the 3rd member is no big deal on the 8.75 or 9".
1967 Barracuda
360ci/727
9.723ET @139.44mph
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Re: 8.75 or 9" Rear?
[Re: Bigcube]
#490490
10/07/09 12:17 PM
10/07/09 12:17 PM
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Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
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master
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Posts: 8,165
Left Coast
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Quote:
Quote:
The Dana 60 is out because of the weight and changing gears are a pain in the butt. I race 1/8 and 1/4 so changing the 3rd member is no big deal on the 8.75 or 9".
I don't find this a good argument against a D60. Most people don't have the extra coin to have 2 GOOD third members laying around. Seems like a good 9" center will be up around $1500?
Our Dewco was closer to 5000.
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As far as gear changes for the 1/8 versus the 1/4 not many racers change the grear ratio that know of, just spray a little more on the line or ten feet out 
