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Re: how much hp can a 8.75 differential take? [Re: Mr.Yuck] #1170495 02/02/12 01:27 PM 02/02/12 01:27 PM
Joined: Jan 2003 Posts: 9,436 Blair County,PA 62maxwgn master
62maxwgn master Joined: Jan 2003 Posts: 9,436 Blair County,PA	Quote: Go get a Furd 9"...all the racers use them

Re: how much hp can a 8.75 differential take? [Re: JohnRR] #1170496 02/02/12 01:30 PM 02/02/12 01:30 PM
Joined: Jan 2003 Posts: 9,436 Blair County,PA 62maxwgn master
62maxwgn master Joined: Jan 2003 Posts: 9,436 Blair County,PA	Quote: Quote: you can do all the mods you want to the 8.75 , billt caps , axles , back brace the rear , spool , in the end the weak link still exists ... the gears ... John,everything is made to be broken,that's why there are replacements.

Re: how much hp can a 8.75 differential take? [Re: DGS] #1170497 02/02/12 02:15 PM 02/02/12 02:15 PM
Joined: Dec 2007 Posts: 18,157 Mass DAYCLONA I Live Here
DAYCLONA I Live Here Joined: Dec 2007 Posts: 18,157 Mass	Do yourself a favor, put a DANA 60 under it, and have no worries.....I've toasted so many 8 3/4 axles/chucks, I won't put one under a decent small block, nevermind a bigblk unless the build requires it I've even wasted a DANA 60, they're not indestructable, but a he11 of a lot more than a 8 3/4 IMHO..... spend the once, rather than twice

Re: how much hp can a 8.75 differential take? [Re: DAYCLONA] #1170498 02/02/12 02:32 PM 02/02/12 02:32 PM
Joined: Mar 2007 Posts: 91 just south of Green Bay wiscon... R Rob74 member
Rob74 member R Joined: Mar 2007 Posts: 91 just south of Green Bay wiscon...	i dont know i have a 8 3/4 with a back brace and a spool with 35 spline axles in my cuda with 31/18.50 hoosier qt pros with a trans brake pulling 1.50 60 footers and never had a problem.. Rob down to just one toy still got my 74 pro street/drag cuda with a best of 10.89@125..i know weak huh?

Re: how much hp can a 8.75 differential take? [Re: Rob74] #1170499 02/02/12 03:11 PM 02/02/12 03:11 PM
Joined: Jan 2003 Posts: 75,092 A Banana Republic near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,092 A Banana Republic near you.	Quote: i dont know i have a 8 3/4 with a back brace and a spool with 35 spline axles in my cuda with 31/18.50 hoosier qt pros with a trans brake pulling 1.50 60 footers and never had a problem.. Rob There's always one in the crowd .. I wasted an 8.75 behind a 340 with a 4speed and NO traction ...

Re: how much hp can a 8.75 differential take? [Re: JohnRR] #1170500 02/02/12 03:20 PM 02/02/12 03:20 PM
Joined: Mar 2007 Posts: 91 just south of Green Bay wiscon... R Rob74 member
Rob74 member R Joined: Mar 2007 Posts: 91 just south of Green Bay wiscon...	and oh yea thats with stock caps and arp bolts in a 742 case i know now that i said that next time i take it out ill blow it up..lmao.. down to just one toy still got my 74 pro street/drag cuda with a best of 10.89@125..i know weak huh?

Re: how much hp can a 8.75 differential take? [Re: JohnRR] #1170501 02/02/12 03:45 PM 02/02/12 03:45 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Quote: Quote: i dont know i have a 8 3/4 with a back brace and a spool with 35 spline axles in my cuda with 31/18.50 hoosier qt pros with a trans brake pulling 1.50 60 footers and never had a problem.. Rob There's always one in the crowd .. I wasted an 8.75 behind a 340 with a 4speed and NO traction ... don't know how..340's can barley make enuff power to spin the tires. It must have been really old and worn out. That or you had a ton of wheel hop.

Re: how much hp can a 8.75 differential take? [Re: Mr.Yuck] #1170502 02/02/12 04:04 PM 02/02/12 04:04 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: Quote: Quote: i dont know i have a 8 3/4 with a back brace and a spool with 35 spline axles in my cuda with 31/18.50 hoosier qt pros with a trans brake pulling 1.50 60 footers and never had a problem.. Rob There's always one in the crowd .. I wasted an 8.75 behind a 340 with a 4speed and NO traction ... don't know how..340's can barley make enuff power to spin the tires. It must have been really old and worn out. That or you had a ton of wheel hop.

Re: how much hp can a 8.75 differential take? [Re: Challenger 1] #1170503 02/02/12 05:13 PM 02/02/12 05:13 PM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	The only 8.75 I have wasted are the ones with stinkin off shore bearings despite big price they are junk. I love all the nay sayer about the 340s and 8.75,if this is the case why haven't prices dropped on them as much as the big block cars?

Re: how much hp can a 8.75 differential take? [Re: Challenger 1] #1170504 02/02/12 06:29 PM 02/02/12 06:29 PM
Joined: Jan 2003 Posts: 75,092 A Banana Republic near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,092 A Banana Republic near you.	Quote: Quote: Quote: Quote: i dont know i have a 8 3/4 with a back brace and a spool with 35 spline axles in my cuda with 31/18.50 hoosier qt pros with a trans brake pulling 1.50 60 footers and never had a problem.. Rob There's always one in the crowd .. I wasted an 8.75 behind a 340 with a 4speed and NO traction ... don't know how..340's can barley make enuff power to spin the tires. It must have been really old and worn out. That or you had a ton of wheel hop. It regularly got spanked by an 81 horizon running on 3 cylinders ...

Re: how much hp can a 8.75 differential take? [Re: 62maxwgn] #1170505 02/02/12 07:11 PM 02/02/12 07:11 PM
Joined: Sep 2011 Posts: 2,042 colorado S savoy64 top fuel
savoy64 top fuel S Joined: Sep 2011 Posts: 2,042 colorado	Quote: Quote: Go get a Furd 9"...all the racers use them to all the non readers out there SAE engineers put the 8.75 (741) vs 9 inch to the test years ago and found the 8.75 was good to 500 hp and the ford 9 to 450 hp---the 9,s weakness is the pinion sitting at the bottom of the ring gear-----yes the after market chased the 9 the way it chased the sbc so there is a ton of things that can be done to it to make it stronger---but after spending $1000+ you might as well build a dana 60----and if you think the aftermarket is really right maybe you 9 inch guys should belly up to a sbc and gm trans and laugh at us forlorn mopar guys and our backwards ways(and dont even get me started on the 8.8)bob---hahahah

Re: how much hp can a 8.75 differential take? [Re: savoy64] #1170506 02/02/12 09:58 PM 02/02/12 09:58 PM
Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada R RUNCHARGER I Live Here
RUNCHARGER I Live Here R Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada	Some of you guys have mega tuff 8 3/4's. I have broken gear sets and twisted axle shafts in them with street tires. My take on it is if it's working well leave it alone, if you have a 500 inch engine and are going to spend upwards of $600 for a new tru track and bearings to install it, maybe you should consider spending the $2k for a Dana and be done with it. Sheldon

Re: how much hp can a 8.75 differential take? [Re: RUNCHARGER] #1170507 02/02/12 10:16 PM 02/02/12 10:16 PM
Joined: Jun 2004 Posts: 3,319 Chicago Burbs sthemi master
sthemi master Joined: Jun 2004 Posts: 3,319 Chicago Burbs	Early funny cars and dragsters ran Blown Hemi's with 8.75 rear ends. The drivers important parts sat straddling the pumpkin. Like everyone has said, with street tires you are not going to have trouble. If you had a stick and slicks dont use the 8.75.. I would recommend the POWER LOC differential unit. Video Little Red Wagon Indy Nats,BurnoutContest

Re: how much hp can a 8.75 differential take? [Re: sthemi] #1170508 02/02/12 10:53 PM 02/02/12 10:53 PM
Joined: Jan 2003 Posts: 9,147 Tucson, AZ Ramrod39 My New Title
Ramrod39 My New Title Joined: Jan 2003 Posts: 9,147 Tucson, AZ	When it comes to new street car builds, I always wait until I break the diff to upgrade.

Re: how much hp can a 8.75 differential take? [Re: JohnRR] #1170509 02/03/12 01:27 AM 02/03/12 01:27 AM
Joined: Dec 2007 Posts: 18,157 Mass DAYCLONA I Live Here
DAYCLONA I Live Here Joined: Dec 2007 Posts: 18,157 Mass	Quote: Quote: i dont know i have a 8 3/4 with a back brace and a spool with 35 spline axles in my cuda with 31/18.50 hoosier qt pros with a trans brake pulling 1.50 60 footers and never had a problem.. Rob There's always one in the crowd .. I wasted an 8.75 behind a 340 with a 4speed and NO traction ... Eh....he just put the "kabosh" on himself,....he'll grenade on the next launch

Re: how much hp can a 8.75 differential take? [Re: DAYCLONA] #1170510 02/03/12 01:37 PM 02/03/12 01:37 PM
Joined: Apr 2006 Posts: 3,675 Akron, Ohio U.S.A. roadhazard master
roadhazard master Joined: Apr 2006 Posts: 3,675 Akron, Ohio U.S.A.	Quote: Quote: Quote: i dont know i have a 8 3/4 with a back brace and a spool with 35 spline axles in my cuda with 31/18.50 hoosier qt pros with a trans brake pulling 1.50 60 footers and never had a problem.. Rob There's always one in the crowd .. I wasted an 8.75 behind a 340 with a 4speed and NO traction ... Eh....he just put the "kabosh" on himself,....he'll grenade on the next launch And I'm not saying a word 'cause I don't want to put the "kabosh" on myself 1.389 60' @ 3,325#

Re: how much hp can a 8.75 differential take? [Re: roadhazard] #1170511 02/03/12 03:11 PM 02/03/12 03:11 PM
Joined: Dec 2011 Posts: 120 Vancouver,Canada 7 70 Roadrunner* member
70 Roadrunner* member 7 Joined: Dec 2011 Posts: 120 Vancouver,Canada	JohnRR...You said there's not much traction to BFG 295-50-15s? Damnnit I just spent a bunch of coin on a fresh set of rears!...and was hoping for traction ...this sucks

Re: how much hp can a 8.75 differential take? [Re: 70 Roadrunner*] #1170512 02/03/12 03:26 PM 02/03/12 03:26 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Quote: JohnRR...You said there's not much traction to BFG 295-50-15s? Damnnit I just spent a bunch of coin on a fresh set of rears!...and was hoping for traction ...this sucks Radial tires (street tires) were not made for all of a suddent all out WOT. They were made for driving. If you want a tire for "sudden starts" you are going to need some sort of a slick. Even a well tuned 3182bl is going to smoke up a radial. I have a set of tires I use for driving and a set that goes on for the track.

Re: how much hp can a 8.75 differential take? [Re: Mr.Yuck] #1170513 02/03/12 04:22 PM 02/03/12 04:22 PM
Joined: Jul 2005 Posts: 640 Graz, Austria DGS OP mopar
DGS OP mopar Joined: Jul 2005 Posts: 640 Graz, Austria	Just sold my Borg-Warner sure grip uni for $250 (was a really nice unit - looked almost new) and ordered a Detroit TrueTrac for $420 with free shipping! That's $100 less than retail

Re: how much hp can a 8.75 differential take? [Re: 70 Roadrunner*] #1170514 02/03/12 04:54 PM 02/03/12 04:54 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier I Live Here
DPelletier I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Quote: JohnRR...You said there's not much traction to BFG 295-50-15s? Damnnit I just spent a bunch of coin on a fresh set of rears!...and was hoping for traction ...this sucks I have to agree with John, sorry; these are 275's.....well you get the idea! http://www.youtube.com/watch?v=Ofma0go-jJk&feature=g-upl&context=G2063d03AUAAAAAAAAAA (jump to 1:27) Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

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