8 3/4 rear end - Moparts Forums

Register Log In Moparts Forums Unlawfl's Race & Engine Tech 8 3/4 rear end

Print Thread

8 3/4 rear end #2619775 02/11/19 01:39 PM 02/11/19 01:39 PM
Joined: May 2007 Posts: 279 Chicago land, IL dafixr OP enthusiast
dafixr OP enthusiast Joined: May 2007 Posts: 279 Chicago land, IL	how much power do u think i can throw at a 8 3/4 rear end . right now its a high 9sec car. makes about 650 to 700hp right now. car is a 71 dart Last edited by dafixr; 02/11/19 01:40 PM.

Re: 8 3/4 rear end [Re: dafixr] #2619779 02/11/19 01:47 PM 02/11/19 01:47 PM
Joined: Dec 2003 Posts: 22,696 Bitopia J jcc If you can't dazzle em with diamonds..
jcc If you can't dazzle em with diamonds.. J Joined: Dec 2003 Posts: 22,696 Bitopia	About 5-6 Cylinders in your case. Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.

Re: 8 3/4 rear end [Re: dafixr] #2619796 02/11/19 02:22 PM 02/11/19 02:22 PM
Joined: Aug 2003 Posts: 4,675 On the parachute mount N n20mstr master
n20mstr master N Joined: Aug 2003 Posts: 4,675 On the parachute mount	YOUR AT THE LIMIT NOW.... ....BAD A$$ STREET CAR.....

Re: 8 3/4 rear end [Re: dafixr] #2619801 02/11/19 02:29 PM 02/11/19 02:29 PM
Joined: Jan 2008 Posts: 755 Rochester, PA (near Pittsburgh... 1 1974 474 Duster super stock
1974 474 Duster super stock 1 Joined: Jan 2008 Posts: 755 Rochester, PA (near Pittsburgh...	My car started hitting regularly low 1.30 60' times. It started the eat ring gears. Now I did have a big tire car, but still. I agree your 8 3/4 is about where it's going to start breaking parts on a regular basis. Thanks, Ken

Re: 8 3/4 rear end [Re: dafixr] #2619859 02/11/19 04:06 PM 02/11/19 04:06 PM
Joined: Dec 2005 Posts: 11,551 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 11,551 Fulton County, PA	High 9s at 650HP. It's no lightweight. I'm surprised you haven't broken it already unless you don't have many runs on it. Just sayin' If the results don't match the theory, change the theory.

Re: 8 3/4 rear end [Re: dafixr] #2619862 02/11/19 04:12 PM 02/11/19 04:12 PM
Joined: Oct 2007 Posts: 4,206 New York polyspheric master
polyspheric master Joined: Oct 2007 Posts: 4,206 New York	Take it out now, while you can still sell it. Boffin Emeritus

Re: 8 3/4 rear end [Re: dafixr] #2619864 02/11/19 04:14 PM 02/11/19 04:14 PM
Joined: Nov 2007 Posts: 21,822 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,822 Kirkland, Washington	The unit you are running must be set up real well, and you must launch pretty darn well too! Congrats, that's impressive. You need a Dana or a GOOD Nine, (the only Ford part worth a crap)

Re: 8 3/4 rear end [Re: dafixr] #2619880 02/11/19 04:42 PM 02/11/19 04:42 PM
Joined: Oct 2003 Posts: 1,561 yarnell,az M mopacltd pro stock
mopacltd pro stock M Joined: Oct 2003 Posts: 1,561 yarnell,az	Axle tube flex is a determining factor. Is the housing back braced and how wide is it?

Re: 8 3/4 rear end [Re: dafixr] #2619948 02/11/19 07:31 PM 02/11/19 07:31 PM
Joined: May 2007 Posts: 279 Chicago land, IL dafixr OP enthusiast
dafixr OP enthusiast Joined: May 2007 Posts: 279 Chicago land, IL	car 60fts 1.30's - 1.40s depending on the track. its a nitrous car also with small 150 shot. so it leaves pretty damn good. we normally run a 10.20 index but wanna turn it up and go to a faster class just trying to see if the rear end should go or can we still beat on it. seems like it needs to go Last edited by dafixr; 02/11/19 07:33 PM.

Re: 8 3/4 rear end [Re: dafixr] #2619978 02/11/19 08:34 PM 02/11/19 08:34 PM
Joined: Nov 2009 Posts: 3,082 St. Paul , Mn. tubtar master
tubtar master Joined: Nov 2009 Posts: 3,082 St. Paul , Mn.	That's a good looking race car. I'd take steps to try and keep it that way.

Re: 8 3/4 rear end [Re: dafixr] #2620148 02/12/19 03:21 AM 02/12/19 03:21 AM
Joined: Feb 2003 Posts: 2,560 S.E. Michigan cl440 master
cl440 master Joined: Feb 2003 Posts: 2,560 S.E. Michigan	When I first started racing the Duster it had a 600 horse 440 that I foot braked. The car weighed approximately 3400 with me in it. The 8 3/4 was fine for that season. We installed a trans brake over the winter. The first launch with the trans brake we broke the ring and pinion! Alot of factors go into longevity of a particular part. Weight, HP, launch style etc......If you can afford it put a Dana 60 in it. Knowing what I know now I wish I had went Dana from the start. I hate spending money twice! This sport is expensive enough as it is.

Re: 8 3/4 rear end [Re: polyspheric] #2620210 02/12/19 11:32 AM 02/12/19 11:32 AM
Joined: Jan 2003 Posts: 13,362 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,362 Marion, South Carolina [><]	Originally Posted By polyspheric Take it out now, while you can still sell it. 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

Re: 8 3/4 rear end [Re: polyspheric] #2620561 02/12/19 11:25 PM 02/12/19 11:25 PM
Joined: Feb 2011 Posts: 1,454 Glendora Ca. J Just-a-dart pro stock
Just-a-dart pro stock J Joined: Feb 2011 Posts: 1,454 Glendora Ca.	Originally Posted By polyspheric Take it out now, while you can still sell it. Truth "Just a Bracket car dressed up like a streetcar"

Re: 8 3/4 rear end [Re: Just-a-dart] #2620604 02/13/19 01:11 AM 02/13/19 01:11 AM
Joined: Feb 2005 Posts: 20,173 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,173 PA.	My Son has 3 years on the 4.10's in his 8 3/4 that were set up by Tim Bowman of Bowman Performance. It ran 10'0's for awhile with my 408 and now 6.54 (10.20-10.30's) with his stock crank 360. Its a 727 with trans-brake car. Since our class now runs 1/8 mile at every track he may step up to a 4.56 gear for 2019. It leaves pretty hard. Untitled by John Cadamore, on Flickr Untitled by John Cadamore, on Flickr Untitled by John Cadamore, on Flickr Untitled by John Cadamore, on Flickr 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: 8 3/4 rear end [Re: dafixr] #2620636 02/13/19 02:27 AM 02/13/19 02:27 AM
Joined: May 2003 Posts: 13,189 aZLiViN J J_BODY I Live Here
J_BODY I Live Here J Joined: May 2003 Posts: 13,189 aZLiViN	35 spline John? We ran 30 spline when my dad had the Duster. We were twisting the daylights out of axles, that’s when we quit spending money on that venture.

Re: 8 3/4 rear end [Re: dafixr] #2620730 02/13/19 12:16 PM 02/13/19 12:16 PM
Joined: Jul 2008 Posts: 1,534 bronx n.y O one bad fish pro stock
one bad fish pro stock O Joined: Jul 2008 Posts: 1,534 bronx n.y	. 8 3/4 I’ve been thinking the same thing

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1