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Will my 8-3/4 hold up?
#446034
08/22/09 01:22 PM
08/22/09 01:22 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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will my stock 8-3/4" rear hold up to slicks behind my new motor? It will be a mild street 451 that should be in the 550 horse range once tuned properly. It's a footbrake / 727 car. The rear end has recently been rebuilt with all new bearings and a fresh sure-grip unit. But its an older gearset that makes noise and has stock axles, and it will be pushing a full weight 67 B-body.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Will my 8-3/4 hold up?
[Re: StealthWedge67]
#446038
08/22/09 02:08 PM
08/22/09 02:08 PM
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Joined: Jan 2003
Posts: 3,031
Erda, UT
67Charger
master
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master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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I feel uniquely qualified to answer this one...
3875# '67 Charger running 4.10's and slicks
I ran my 446" at just under 500hp for quite some time, and the stock axles were twisting up. A set of Dutchmans solved that until I went to a 560HP 496" motor, then the Dutchmans twisted and I upgraded to 35 spline Dutchmans. This has worked OK, but now that I'm hitting it with nitrous, I'm just waiting for it to explode. The weak link is now the caps. The cost of the caps and machine work make it cost ineffective to proceed with this rear any more.
I bought a Dana 60 housing for $125, housing ends and perches for $100, a spool for $180, used gears for $75, bearing kit for $125, $350 for new axles and bearings, and $150 in labor to shorten the housing. Total: $1005.
Compare that to he necessary work on an 8 3/4. Mark Williams cap is $100 and $250 to machine and install it, and it will only buy you a little bit of durability. 35 spline axles are $350, spool to fit the bigger axles is $180. Total: $880
$125 is all you'll save and not have NEAR the durability. I got here incrementally, but I can sell off my parts to recoup some cost. Heck, I'll sell you my whole complete running 35 spline 4.10/spool rear out of my Charger and save you some effort, but you will not want to go any faster than 11.00. I've had it to 10.75, but I really don't trust it down there, thus the Dana.
11.33 @ 118.46 on motor
10.75 @ 125.35 w/ a little spray
Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race
Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: Will my 8-3/4 hold up?
[Re: StealthWedge67]
#446039
08/23/09 12:27 AM
08/23/09 12:27 AM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Of course it will...........  I`ve been running mid to low 10`s for years and mine`s still tickin and plan on keepin it too.
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: Will my 8-3/4 hold up?
[Re: moparniac]
#446043
08/23/09 09:21 AM
08/23/09 09:21 AM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
just a matter of time. 
then 
The concensus by MOST on the board is its gonna blow.... I think maybe 3 members will tell you its gonna hold up .... not good odds if you ask me 
WATCH IT,they will make a movie about you 
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Re: Will my 8-3/4 hold up?
[Re: moparniac]
#446045
08/23/09 09:31 AM
08/23/09 09:31 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:
Quote:
just a matter of time.
then
The concensus by MOST on the board is its gonna blow.... I think maybe 3 members will tell you its gonna hold up .... not good odds if you ask me
There are certain things I would do to the 8 3/4 to
help it live.... bearing caps and a back brace. The
stock axles arent any worse than the other stock
axles... they will twist(just like any stock axle)
My 8 3/4 has been living just fine but now I have
the alum center in it and my car is light.... to
me weight is what kills the 8 3/4..... my best 60'
is 1.19 with a normal 1.21. I was running a complete
stock 8 3/4 for years with a back brace and good axles
(had over 600 passes and it finally broke the stock caps
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Re: Will my 8-3/4 hold up?
[Re: MR_P_BODY]
#446046
08/23/09 10:34 AM
08/23/09 10:34 AM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
Quote:
just a matter of time.
then
The concensus by MOST on the board is its gonna blow.... I think maybe 3 members will tell you its gonna hold up .... not good odds if you ask me
There are certain things I would do to the 8 3/4 to
help it live.... bearing caps and a back brace. The
stock axles arent any worse than the other stock
axles... they will twist(just like any stock axle)
My 8 3/4 has been living just fine but now I have
the alum center in it and my car is light.... to
me weight is what kills the 8 3/4..... my best 60'
is 1.19 with a normal 1.21. I was running a complete
stock 8 3/4 for years with a back brace and good axles
(had over 600 passes and it finally broke the stock caps
by the time you do all of that you could have bought a dana (ford truck rear) or a real race rear end
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Re: Will my 8-3/4 hold up?
[Re: Thumperdart]
#446049
08/23/09 10:45 AM
08/23/09 10:45 AM
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Joined: Jan 2003
Posts: 1,855
Staten Island N.Y.
Dap
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,855
Staten Island N.Y.
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Mine is holding up so far. 3300lb aftermarket axles from DR Diff, Alum center section. No back brace.
PRH446
10.084 @ 135.21 mph N/A through chambered mufflers,3300lbs. Stock stroke wedge
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Re: Will my 8-3/4 hold up?
[Re: moparniac]
#446051
08/23/09 10:55 AM
08/23/09 10:55 AM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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That should work..........I`m done racing for quite a while since I met my 9-sec goal and actually enjoy driving it more than racing it + it`s WAY cheaper.
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: Will my 8-3/4 hold up?
[Re: Thumperdart]
#446052
08/23/09 11:27 AM
08/23/09 11:27 AM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
That should work..........I`m done racing for quite a while since I met my 9-sec goal and actually enjoy driving it more than racing it + it`s WAY cheaper.
Dom have ever had real slicks on your car?
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Re: Will my 8-3/4 hold up?
[Re: Quicktree]
#446053
08/23/09 11:47 AM
08/23/09 11:47 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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How often do you plan to race it ?? I can tell you my son and I both have 8-3/4 rears in our cars. His Dart has been on the road since 1997 and it has been raced a few times a year since 2001. My 63 has been raced about 6 times since I put it on the road in 2006. Both rears are all stock but I have a Locker in mine. We had the axles out last year and both his and mine are not twisted. I figured we would run it until the axles twist or something breaks but they are holding up fine in our mid 11 cars we race about 2 or 3 times a year. Thats why I ask how much you will race it as if only a couple times a year I would go with it and see how it holds up. Ron
Last edited by 383man; 08/23/09 11:47 AM.
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Id love to have mine come in at 3400 race ready 