Where do you draw the line with stock 8-3/4" axles? - Moparts Forums

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Where do you draw the line with stock 8-3/4" axles? #1179393 02/16/12 03:53 PM 02/16/12 03:53 PM
Joined: Jul 2006 Posts: 4,319 Puyallup, WA S StealthWedge67 OP master
StealthWedge67 OP master S Joined: Jul 2006 Posts: 4,319 Puyallup, WA	..... And am I close to that line? Strattling the line? Over the line? Here's the particulars: Full weight (3775# with me in the seat) '67 B-Body. Street / Strip car, running 255/60 drag radials. 451 / 727 combo, footbreaking. Ran 12.0's last year with a 1.70 short time. A few mods this winter should put me in the 11.80's and maybe 1.68 60's (??).I'd like the car to eventually run solid mid-11's. It has a fresh center section with 3.91's and an Eaton clutch sure-grip unit. The stock axles looked fine with no visual evidence of twist when I had it apart in the fall. So where do I stand? LemonWedge - Street heavy / Strip ready - 11.07 @ 120

Re: Where do you draw the line with stock 8-3/4" axles? [Re: StealthWedge67] #1179394 02/16/12 04:15 PM 02/16/12 04:15 PM
Joined: Sep 2007 Posts: 426 Cascade, CO reknapp52 mopar
reknapp52 mopar Joined: Sep 2007 Posts: 426 Cascade, CO	You'll probably start breaking the ring and pinion before the axles give you trouble. Keep an eye on the axle splines, they will twist quite a bit before they will break. That is my experience from running a small block with 4-speed years ago. 7074444-LebaronatTexasLODRS.jpg (59 downloads)

Re: Where do you draw the line with stock 8-3/4" axles? [Re: reknapp52] #1179395 02/16/12 04:20 PM 02/16/12 04:20 PM
Joined: Aug 2004 Posts: 1,413 Newark,Ohio kissmyaspen pro stock
kissmyaspen pro stock Joined: Aug 2004 Posts: 1,413 Newark,Ohio	My dads 67 satellite has been 11.70's 1.56 60 foot with stock axles.. Only broke one and it has a spool in it. Its getting mosers soon. 79 Dodge Aspen 12.265 at 109.75 MPH 67 Satellite NSS/E 11.83 @ 110 1968 Plymouth Road Runner 472 Hemi 3 time MOPAR NATIONALS CHAMP '03 FWD and '06 & '09 Street. '07, '10, '12 Mopar Nats runner-up Street.

Re: Where do you draw the line with stock 8-3/4" axles? [Re: kissmyaspen] #1179396 02/16/12 05:41 PM 02/16/12 05:41 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	How often to you plan to race ? I ask because if you are like me and just do a few T & T races or some local races which for me is about 2 to 4 times a year I might race my 63. This year I had it out 3 times running high 10's and you know I have raced my 63 a few times a year since 2006 and even the old eng ran mid 11's. My point is my axles still look fine with no twist at all on the splines. I am seriously thinking I may want to go to a Dana now that it has run 10.70's and I hope to drop that et some but the rear is still holding up. Course if I raced alot I would not hesitate to go to a Dana. But if you only race a few times a year you may be fine in a mid 11 car. And I am using a Detroit Locker with stock axles. Course it will never hurt to upgrade because if the rear does break you best pull the trans and check the overrunning clutch if its an auto. Ron Last edited by 383man; 02/16/12 05:44 PM.

Re: Where do you draw the line with stock 8-3/4" axles? [Re: 383man] #1179397 02/16/12 07:00 PM 02/16/12 07:00 PM
Joined: Jun 2010 Posts: 80 Fredonia,NY W wafflebatter member
wafflebatter member W Joined: Jun 2010 Posts: 80 Fredonia,NY	my roadster has an 8 3/4, moser axles, strange center, back brace, car has been 5.52 @ 123mph in the 1/8 with a 1.18 60ft, I'm sure I am pushing it to max limits, but the car only weighs 1900lbs 7074715-pitt10.jpg (32 downloads)

Re: Where do you draw the line with stock 8-3/4" axles? [Re: reknapp52] #1179398 02/16/12 07:02 PM 02/16/12 07:02 PM
Joined: Aug 2006 Posts: 83 Mississippi Gulf Coast M Mroctober member
Mroctober member M Joined: Aug 2006 Posts: 83 Mississippi Gulf Coast	Quote: You'll probably start breaking the ring and pinion before the axles give you trouble. Keep an eye on the axle splines, they will twist quite a bit before they will break. That is my experience from running a small block with 4-speed years ago. 2X, 4 Speed 11.90 Dart on the street !!!!!!!! Last edited by Mroctober; 02/16/12 07:07 PM.

Re: Where do you draw the line with stock 8-3/4" axles? [Re: Mroctober] #1179399 02/16/12 07:28 PM 02/16/12 07:28 PM
Joined: Aug 2003 Posts: 43,204 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,204 Bend,OR USA	A SB 4 speed car will break axles a lot quicker than a BB car of the same weight with a footbrake 727 trans. will Been there done that, more than once Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Where do you draw the line with stock 8-3/4" axles? [Re: StealthWedge67] #1179400 02/16/12 08:13 PM 02/16/12 08:13 PM
Joined: Jan 2003 Posts: 75,020 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,020 U.S.S.A.	Quote: ..... And am I close to that line? Strattling the line? Over the line? Here's the particulars: Full weight (3775# with me in the seat) '67 B-Body. Street / Strip car, running 255/60 drag radials. 451 / 727 combo, footbreaking. Ran 12.0's last year with a 1.70 short time. A few mods this winter should put me in the 11.80's and maybe 1.68 60's (??).I'd like the car to eventually run solid mid-11's. It has a fresh center section with 3.91's and an Eaton clutch sure-grip unit. The stock axles looked fine with no visual evidence of twist when I had it apart in the fall. So where do I stand? How much racing are you planning on doing ? the better you 60 ft the bigger the chance of twisting the axles , luckily with an 8.75 the axle will not exit stage left when the end twists off . I'd think about changing when funds allow.

Re: Where do you draw the line with stock 8-3/4" axles? [Re: JohnRR] #1179401 02/16/12 09:04 PM 02/16/12 09:04 PM
Joined: Jul 2006 Posts: 4,319 Puyallup, WA S StealthWedge67 OP master
StealthWedge67 OP master S Joined: Jul 2006 Posts: 4,319 Puyallup, WA	You guys bring up a good point: I'll only race 5-6 times a year if I'm lucky. Sounds like the consensus is that I'm fine for now. I'll make a point of checking the axles each winter, and spend the money on something else. Thanks as always, guys. LemonWedge - Street heavy / Strip ready - 11.07 @ 120

Re: Where do you draw the line with stock 8-3/4" axles? [Re: StealthWedge67] #1179402 02/16/12 09:13 PM 02/16/12 09:13 PM
Joined: Nov 2003 Posts: 4,027 Dearborn Hts, MI Sledge_57 master
Sledge_57 master Joined: Nov 2003 Posts: 4,027 Dearborn Hts, MI	Quote: ..... And am I close to that line? Strattling the line? Over the line? Here's the particulars: Full weight (3775# with me in the seat) '67 B-Body. Street / Strip car, running 255/60 drag radials. 451 / 727 combo, footbreaking. Ran 12.0's last year with a 1.70 short time. A few mods this winter should put me in the 11.80's and maybe 1.68 60's (??).I'd like the car to eventually run solid mid-11's. It has a fresh center section with 3.91's and an Eaton clutch sure-grip unit. The stock axles looked fine with no visual evidence of twist when I had it apart in the fall. So where do I stand? On the edge Maybe the Sure Grip will help save them (I have a locker) but my 67 broke an axle the day I dipped into the 11's. I had 4 passes that day, a 12.2, two 11.97's and a 22.42. Guess which one the axle broke on Replace the axles, when the stock axle breaks you'll be looking at possible trans (sprag) problems too. JUST DO IT...... Doug 1967 "Pedal Car" 500" low deck , TF 727, 4.30 Locker Best to Date: 11.67 @ 114.9 1.64 60ft "Kids in cars cause accidents. Accidents in cars cause kids..."

Re: Where do you draw the line with stock 8-3/4" axles? [Re: Sledge_57] #1179403 02/16/12 09:32 PM 02/16/12 09:32 PM
Joined: Jun 2004 Posts: 6,780 Alabama Mopar-Al master
Mopar-Al master Joined: Jun 2004 Posts: 6,780 Alabama	My 72 cuda was 3780 with me in it. Went 9.82 with a 1.31 60 ft I had a spool, 430 gear and moser axles. all new, went about 5 passes and ended up having serious back lash in the gears. Went straight to a dana the next race. I was trans braking tho, and leaving at 5500. My car went on a 1200 lb diet, so things are good.

Re: Where do you draw the line with stock 8-3/4" axles? [Re: wafflebatter] #1179404 02/16/12 10:01 PM 02/16/12 10:01 PM
Joined: Jul 2010 Posts: 2,422 Pittsburgh PA Eric top fuel
Eric top fuel Joined: Jul 2010 Posts: 2,422 Pittsburgh PA	Quote: my roadster has an 8 3/4, moser axles, strange center, back brace, car has been 5.52 @ 123mph in the 1/8 with a 1.18 60ft, I'm sure I am pushing it to max limits, but the car only weighs 1900lbs So build a motor with more HP... ...that way you will know for sure... ...oh thats right..you're doing that already. 5.53 @ 125 1/8th on the launch control..more left in her!

Re: Where do you draw the line with stock 8-3/4" axles? [Re: Mopar-Al] #1179405 02/16/12 10:06 PM 02/16/12 10:06 PM
Joined: Sep 2004 Posts: 2,093 oberlin, Ohio Rapid340 top fuel
Rapid340 top fuel Joined: Sep 2004 Posts: 2,093 oberlin, Ohio	I've heard of a fair amount of aftermarket axles breaking lately in applications they shouldn't. You might be better off with known US made steel axles (stock ones), even if they are 40 years old. 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: Where do you draw the line with stock 8-3/4" axles? [Re: Rapid340] #1179406 02/16/12 10:37 PM 02/16/12 10:37 PM
Joined: Jun 2009 Posts: 429 Sherman Texas T The Shocker mopar
The Shocker mopar T Joined: Jun 2009 Posts: 429 Sherman Texas	One of the hardest things on axles (especially stock axles) is not the hard launches it is running a spool IMO.I broke many stock 9 inch Ford axles in street cars running a spool on the street (and sum of them never got raced on a track).What i mean is people run a spool for a while and twist the axles ,and the first time they get a good launch they snap and people assume the launch is what broke the axle when infact the axle was already weak from the sharp turns with the spool.I got so good at changing them i would pull the other side axle out and then run a long dowl rod to knock the broken piece of axle out .Then i would run a broom handle with a magnent taped to the end down the axle tube to retreave the piece .I could change the axle without dropping the chunk out this way and be back on the road (hey i was a teenager ,lol). They all twisted off right past the splines and i broke the biggest part of them on the left side .The reason the left side breaks most is because of the sharper turns that take place to the right on the street.My Dart drag only car has an 8.75 and im running a spool and 35 spline Moser axles ,but im still easy with it and take 3 point turns off the trailer ,onto the track ,etc when i can.I also inspect my axles for signs of twist at the end of each season ,but the 35 spline Moser's are still straight as an arrow after 5 seasons now ... Last edited by The Shocker; 02/16/12 10:48 PM.

Re: Where do you draw the line with stock 8-3/4" axles? [Re: The Shocker] #1179407 02/16/12 11:00 PM 02/16/12 11:00 PM
Joined: Mar 2008 Posts: 553 Kentucky clovis mopar
clovis mopar Joined: Mar 2008 Posts: 553 Kentucky	My 8 3/4 has probably 300 passes on it with stock axles and a spool. I'm about 3400 lbs, footbrake and ran high 10's-still has no signs of twisting. With the new motor I went ahead and put a Dana in, as the difference in price when starting at ground zero is pretty nominal. '75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119 "For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"

Re: Where do you draw the line with stock 8-3/4" axles? [Re: clovis] #1179408 02/17/12 12:14 AM 02/17/12 12:14 AM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	We raced my dads challenger for lots years with stock axles, Heavy car, went 1.63 best and 11.90's. Never hurt the axles. You SHOULD be fine. -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: Where do you draw the line with stock 8-3/4" axles? [Re: Triple Threat] #1179409 02/17/12 05:02 PM 02/17/12 05:02 PM
Joined: Jan 2005 Posts: 3,635 Oakland, MI D dizuster master
dizuster master D Joined: Jan 2005 Posts: 3,635 Oakland, MI	If it makes you feel any better, I'm going to foot break my near stock weight '62 B-body with a turbo small blocck and stock axles this year. Worst case it breaks one and I have to take the trans back out to check the sprag... but I'll have a few weeks while I'm waiting for the Dana to be built at that point... LOL... I know my Dad's roots blown small block Volare at 3785lbs went HUNDREDS (4,5,600?)of runs and never broke an axle in the mid 11's. It had the same axles in it for 25 years before we hopped the motor up to the 11.0's and put some chinese replacements in it. 8 3/4 are a lot better then people want to give them credit for. As mentioned, sticks/trans brakes, and spools give them a bad rep'. I broke my buddies in his '62 12.20 Plymouth... but it had a spool.

Re: Where do you draw the line with stock 8-3/4" axles? [Re: dizuster] #1179410 02/18/12 06:30 PM 02/18/12 06:30 PM
Joined: Nov 2004 Posts: 3,619 Norwich CT USA Defbob master
Defbob master Joined: Nov 2004 Posts: 3,619 Norwich CT USA	I snapped a pinion in my convertible..... on the street. BUT I am aggressive with the 4speed. The car runs 11.54 @ 116mph, 1.70 60' with 3.55 gears. I now have Richmond 4.30 gears. Dana 60 is coming soon.

Re: Where do you draw the line with stock 8-3/4" axles? [Re: StealthWedge67] #1179411 02/18/12 06:34 PM 02/18/12 06:34 PM
Joined: Jan 2003 Posts: 16,928 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,928 NC	It didn't take long to break a stock 1973 axle in an 8-3/4 on my 'Cuda. About 3700 lbs, 440 CID, high 11's, 1.55 sixty foot, 3900 stall converter, 10.5 slicks.

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