8 3/4 main caps
#798029
09/10/10 03:51 PM
09/10/10 03:51 PM
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Joined: Jan 2003
Posts: 549
Bristol, Va
fasteddie
OP
mopar
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OP
mopar
Joined: Jan 2003
Posts: 549
Bristol, Va
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Need them for a 489 case. Did a search and came up empty.
Seems like I read that somebody makes a stronger cap.
What's the best to make this area stronger? Don't want to break again.
Thanks
2003 Bristol Dragway Sportsman Champion
2016 Bristol Dragway Power Hour Champion
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Re: 8 3/4 main caps
[Re: RacerGofKGB]
#798032
09/10/10 04:00 PM
09/10/10 04:00 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:
Just out of curiosity... Do you need to get the new caps line bored/honed like you would new main caps on an engine?
Just milled to line up the threads for the adjuster
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Re: 8 3/4 main caps
[Re: CraigS]
#798035
09/10/10 07:35 PM
09/10/10 07:35 PM
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Joined: Aug 2003
Posts: 43,240
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,240
Bend,OR USA
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Quote:
i did the mark williams main caps in my 8/ 3/4".
had to have the machine shop machine them,instructions come with them.
still broke it again....I now have a dana,no more breakage.
The 8 3/4 was maxed out,markwilliams caps...moser spool,axles,yoke(billet),back brace everything you can do!!!
Iknow this has been repeated a million times on here,but i will say it...dont waste your time and money on the 8 3/4,go on and get a dana
 As long as the car is above 3100 lbs with driver and it makes 450 HP + and hooks good  I have raced cars with 8 3/4 for years and I have broke a lot of 8 3/4 parts as well as watch freinds of mine break 8 3/4, switch now before spending any more money and wasting it trying to prevent the 8 3/4 from breaking parts 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 8 3/4 main caps
[Re: CraigS]
#798036
09/10/10 07:41 PM
09/10/10 07:41 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Quote:
i did the mark williams main caps in my 8/ 3/4".
had to have the machine shop machine them,instructions come with them.
still broke it again....I now have a dana,no more breakage.
The 8 3/4 was maxed out,markwilliams caps...moser spool,axles,yoke(billet),back brace everything you can do!!!
Iknow this has been repeated a million times on here,but i will say it...dont waste your time and money on the 8 3/4,go on and get a dana
Ya, stay away from those 8 3/4`s cos they just don`t live in med to heavy cars w/any kind of power.....  There`s guys on here WAY faster than me runnin em w/great success. I must be lucky or not have enuff power to break mine  with that said, my next rear will likely be a dana 60. 
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 8 3/4 main caps
[Re: fasteddie]
#798037
09/10/10 09:54 PM
09/10/10 09:54 PM
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Joined: Jan 2003
Posts: 549
Bristol, Va
fasteddie
OP
mopar
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OP
mopar
Joined: Jan 2003
Posts: 549
Bristol, Va
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Car is a 72 Dart. 3500 lbs race ready. Runs 7.60s in 1/8th and 12.1 in 1/4. I should point out that I have been running this gear for 22 years, the first 2 years were behind a 4 speed. A Dana is probably not possible right now.
Last edited by fasteddie; 09/10/10 09:55 PM.
2003 Bristol Dragway Sportsman Champion
2016 Bristol Dragway Power Hour Champion
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Re: 8 3/4 main caps
[Re: Stroker Scamp]
#798039
09/10/10 11:29 PM
09/10/10 11:29 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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I just did the pass. side per their recommendations. And all the other little tricks. If it pukes , I will step up. But I was throwing money at it before I realized that it might be a problem , and now I am what we in the industry call " pot committed ".  There is a steep learning curve with these MoPars , but I'm learning. I'm not a purist........it will be a 9" if and when. As far as milling the cap to fit , that was easy enough. I think we had to shave .017 per side to make it right.
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Re: 8 3/4 main caps
[Re: tubtar]
#798040
09/11/10 01:13 AM
09/11/10 01:13 AM
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Joined: Aug 2003
Posts: 43,240
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,240
Bend,OR USA
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Quote:
I just did the pass. side per their recommendations.
And all the other little tricks.
If it pukes , I will step up.
But I was throwing money at it before I realized that it might be a problem , and now I am what we in the industry call " pot committed ".
There is a steep learning curve with these MoPars , but I'm learning.
I'm not a purist........it will be a 9" if and when.
As far as milling the cap to fit , that was easy enough.
I think we had to shave .017 per side to make it right.
The left side(drivers side) is the one that breaks first, the pinion gear is trying to force the front of the ring gear away from the center of the pinion I have seen more left side caps break than both sides at the same time
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 8 3/4 main caps
[Re: CraigS]
#798043
09/11/10 01:57 PM
09/11/10 01:57 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:
hey,I loved my 8 3/4....
i thought it would live
but i broke it 6 times,and 4 of those it broke the tranny too!!!
thats 1000-1500 dollars a pop to fix it every time
dana was 2300 brand new
its alot of money,but now i dont fix it any more
i think its a heavy car problem
i am at 3280 lbs ,and right at 500 horse,and the 8 3/4 was good for about 300 passes before explosion
I think if you are under 3000 lbs and smallblock it would live
Now I need to fish for an opinion.
I could sell mine...........she's a virgin.
I will be near 3,200 lbs and 600 h.p.
Foot braked with 3.91's , a low gear 904 and 28.5 X 10.5 " drag radials.
Should I just save myself the pain and dump it ?
It will be street driven.
742 case , spool , Moser axles , back brace , billet yoke and 1350 joints.
It is a nice piece and I'd hate to wreck it and get .7 1/2 a pound for what's left.
oh , yea.......billet cap.
Last edited by tubtar; 09/11/10 01:59 PM.
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Re: 8 3/4 main caps
[Re: tubtar]
#798044
09/11/10 02:27 PM
09/11/10 02:27 PM
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Joined: Mar 2009
Posts: 1,058
bigfork mn
dragram440
super stock
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super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
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I have a 8 3/4 with 35 spline axles spool and forged yoke (1350) style. car weighs 3740 with me in it. runs mid 10's has 8 passes on it. stock caps. sounds like I am asking for problems. I am thinking of selling it befor it goes and building a 9" what do ya think it might be worth. its all brand new with motive 3.91's
Last edited by dragram440; 09/11/10 04:08 PM.
67' charger 499 RB
10.57 at 127
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Ive got dana 60s on the brain.
