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Re: 8 3/4 back brace
[Re: DemonDust]
#1065241
08/29/11 07:18 PM
08/29/11 07:18 PM
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Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
Moparnut426
I Live Here
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I Live Here
Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
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Pluss you might have clearance issues with the brace in the way of the fuel tank. I know a Dana is close, and most guys have to "clearance" the tank    . I think an 8.75 will hold up for a while, are you an auto or stick cause IMHO thik that makes a difference also. Sorry just read its a 4 gear, so I guess ya better brace or upgrade. Kasey
Last edited by moparnut426; 08/29/11 07:19 PM.
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Re: 8 3/4 back brace
[Re: Moparnut426]
#1065242
08/29/11 07:27 PM
08/29/11 07:27 PM
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Joined: Jan 2003
Posts: 8,182
Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,182
Plymouth, MI
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Depends how grabby your clutch is. If you have something like a centerforce, you'll be driving over your driveshaft at some point. If you do baby the car on the street, it will be okay until you upgrade, but don't dump the clutch (feather it out only), no burnouts, and no powershifting. Or, just put junk street tires on it that won't hook, you'll be fine on them.
The brace won't help you any, either. It's not worth the effort.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: 8 3/4 back brace
[Re: Blusmbl]
#1065243
08/29/11 07:43 PM
08/29/11 07:43 PM
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Joined: Dec 2009
Posts: 20,657
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,657
in a cattle trailer down by th...
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Quote:
Depends how grabby your clutch is. If you have something like a centerforce, you'll be driving over your driveshaft at some point. If you do baby the car on the street, it will be okay until you upgrade, but don't dump the clutch (feather it out only), no burnouts, and no powershifting. Or, just put junk street tires on it that won't hook, you'll be fine on them.
The brace won't help you any, either. It's not worth the effort.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 8 3/4 back brace
[Re: 8urvette]
#1065244
08/29/11 07:47 PM
08/29/11 07:47 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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As for the back brace it helps ALOT... the ends of the housing are trying to bend forwards if it has any bite at all... I've seen and fixed many with bent axle tubes... I would also invest in the caps... 4 speeds are hard on the 8 3/4 but there were PLENTY of cars that came with the 8 3/4, including 4 speeds but with the brace and caps it will help alot... can you still break it... sure you can(and you can break a dana also)... everything has a breaking point.... now days if I narrow a 8 3/4 for a customer I always suggest the back brace 
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Re: 8 3/4 back brace
[Re: MR_P_BODY]
#1065245
08/29/11 08:57 PM
08/29/11 08:57 PM
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Joined: Jan 2003
Posts: 8,182
Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,182
Plymouth, MI
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I probably should've clarified. I agree, the back brace does help, especially for the axle shafts themselves. However, I don't think they'd help at all in this situation, with the common shock loading failure that a 4 speed adds to the equation- I'd guess it is more likely to break the pinion or ring gear than the axles. They lived behind 383 4 speed B bodies on street tires. It certainly is not going to live behind a 543" RB 4 speed with a street friendly clutch and cheater slicks. The money spent on a backbrace and axle caps should be saved and applied to a Dana or 9".  If you can make one on your own for little/no investment, it's not going to hurt anything, but I wouldn't put any faith in it either. I tried to make my 8 3/4 live in my Charger, as soon as I put decent tires on the car it spit out a ton of rearend parts. U joints, a pinion (in half- not missing teeth), axle (on a drag radial, cutting stellar 2.0 60's at Milan), etc. I never broke a ring gear, but I'd imagine with any more power it would've been next.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: 8 3/4 back brace
[Re: Blusmbl]
#1065246
08/29/11 09:28 PM
08/29/11 09:28 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:
I probably should've clarified. I agree, the back brace does help, especially for the axle shafts themselves. However, I don't think they'd help at all in this situation, with the common shock loading failure that a 4 speed adds to the equation- I'd guess it is more likely to break the pinion or ring gear than the axles.
They lived behind 383 4 speed B bodies on street tires. It certainly is not going to live behind a 543" RB 4 speed with a street friendly clutch and cheater slicks. The money spent on a backbrace and axle caps should be saved and applied to a Dana or 9". If you can make one on your own for little/no investment, it's not going to hurt anything, but I wouldn't put any faith in it either.
I tried to make my 8 3/4 live in my Charger, as soon as I put decent tires on the car it spit out a ton of rearend parts. U joints, a pinion (in half- not missing teeth), axle (on a drag radial, cutting stellar 2.0 60's at Milan), etc. I never broke a ring gear, but I'd imagine with any more power it would've been next.
Based on the info he gave it wont have a problem
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Re: 8 3/4 back brace
[Re: 8urvette]
#1065248
08/29/11 09:37 PM
08/29/11 09:37 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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I have one on my 8 3/4 but its sorta hard to see and I have one on my 9" thats easier to see.... same thing basically 2" X 3" rectangular tubing this first one is my 8 3/4
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Re: 8 3/4 back brace
[Re: 8urvette]
#1065251
08/29/11 09:59 PM
08/29/11 09:59 PM
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Joined: Oct 2004
Posts: 16,480
Canada
CrAzYMoPaRGuY
I Live Here
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I Live Here
Joined: Oct 2004
Posts: 16,480
Canada
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 1968 340 4 speed Barracuda, 4.56 gears, beaten to death street racing over a 10 year span.... 8 3/4 rear with stock caps and NO back brace. Never had any rear end problems whatsoever.  This is what I did for my Coupe, after destroying a half dozen ferd 9" rear centers in my Demon... with a HYDRAULIC CAMMED 440... I swore never again a 9". I backbraced my housing with load bolt provisions and MW caps. I'm 650hp with 2900 pounds. If it breaks it breaks, but I'm confident it won't, and have no problem trying other solutions if it does. I had a 500ish hp 440 in the same car for YEARS and YEARS with a non-braced 8 3/4, never had any trouble with it either. Beat the car on a daily basis. New setup... 
CrAzYMoPaRGuY
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Re: 8 3/4 back brace
[Re: Blusmbl]
#1065252
08/29/11 10:01 PM
08/29/11 10:01 PM
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Joined: Dec 2009
Posts: 20,657
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,657
in a cattle trailer down by th...
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Quote:
I probably should've clarified. I agree, the back brace does help, especially for the axle shafts themselves. However, I don't think they'd help at all in this situation, with the common shock loading failure that a 4 speed adds to the equation- I'd guess it is more likely to break the pinion or ring gear than the axles.
They lived behind 383 4 speed B bodies on street tires. It certainly is not going to live behind a 543" RB 4 speed with a street friendly clutch and cheater slicks. The money spent on a backbrace and axle caps should be saved and applied to a Dana or 9". If you can make one on your own for little/no investment, it's not going to hurt anything, but I wouldn't put any faith in it either.
I tried to make my 8 3/4 live in my Charger, as soon as I put decent tires on the car it spit out a ton of rearend parts. U joints, a pinion (in half- not missing teeth), axle (on a drag radial, cutting stellar 2.0 60's at Milan), etc. I never broke a ring gear, but I'd imagine with any more power it would've been next.
I still agree, I personally wouldn't expend the effort to back brace the 8.75 in your application. I don't think it's going to help anything. If you get the tires to hook you are going to have way more problems than a backbrace can solve. So why bother? Just baby it and save your money for a Dana.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 8 3/4 back brace
[Re: CrAzYMoPaRGuY]
#1065254
08/29/11 10:05 PM
08/29/11 10:05 PM
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Joined: Dec 2009
Posts: 20,657
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,657
in a cattle trailer down by th...
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Quote:
1968 340 4 speed Barracuda, 4.56 gears, beaten to death street racing over a 10 year span.... 8 3/4 rear with stock caps and NO back brace. Never had any rear end problems whatsoever.
This is what I did for my Coupe, after destroying a half dozen ferd 9" rear centers in my Demon... with a HYDRAULIC CAMMED 440... I swore never again a 9".
I backbraced my housing with load bolt provisions and MW caps. I'm 650hp with 2900 pounds. If it breaks it breaks, but I'm confident it won't, and have no problem trying other solutions if it does.
I had a 500ish hp 440 in the same car for YEARS and YEARS with a non-braced 8 3/4, never had any trouble with it either. Beat the car on a daily basis.
Funny my 4 speed 340 Duster never made a full pass with the 8.75. It was either swap to a Dana or an automatic, I chose the automatic. I have the aluminum center section in mine with a pro gear and have been good to this point but before with a street gear I would plan on a ring and pinion every 2 seasons or so.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 8 3/4 back brace
[Re: MR_P_BODY]
#1065256
08/29/11 10:18 PM
08/29/11 10:18 PM
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Joined: Dec 2009
Posts: 20,657
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,657
in a cattle trailer down by th...
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Quote:
Funny my 4 speed 340 Duster never made a full pass with the 8.75. It was either swap to a Dana or an automatic, I chose the automatic. I have the aluminum center section in mine with a pro gear and have been good to this point but before with a street gear I would plan on a ring and pinion every 2 seasons or so.
I'm on my 5th year on my street gears... still perfect
To the OP... those load bolt just slightly load the
back of the caps (inside) so they are less likely to break
Yeah, your car is probably lighter than mine was but good luck to you. 
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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