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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.

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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

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Yeah, your car is probably lighter than mine was but good luck to you.

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His car is a heckuva lot faster than yours too !!! My 340 was a second and a half slower than your 340!!
I have had ONE 8 3/4 rear break after 25+ years of very abusive street racing with dozens and dozens of cars.
My Cuda was beaten severely for years and years with the same 4.56 8 3/4 rear. It also had the same A833 tranny. Never had problems with either.

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It's just a threaded spud, you can use a long allen screw or cap bolt, use a jam nut to lock it down just past finger tight. It should hit the center of the caps, prevents them from moving rearward and getting broken or spit out.

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Its simple to make... I lay it on the back with the
same gap at each end then set my dividers to the gap
then scribe the tubing keep your dividers square to
the axle housing ..... DONT WELD IT ALL AT ONCE
weld 1" sections and jump around so you dont bow the
axle tubes

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..... DONT WELD IT ALL AT ONCE
weld 1" sections and jump around so you dont bow the
axle tubes

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THIS!

Be a builder listen to the guys that know! It will be better than doing nothing!!!

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I have to get Mike(P-Body)to put a back brace on my 8.750 in my GTX!...probably next spring,when I get rid of the stock,factory axles!

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the main cap bolt tubes, do they leak then? what size should i use? what grade bolt? and does the threaded pitch matter?

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does anybody have pics of a well made home made brace? I have access to just about everything i could ever need to do this. I am a ok welder at best, but my friend owns a welding fabrication business. He offered me the use of his shop, equipment and expertise... so i figured for the cost of the steel I could make my own. And be well ahead of a stock housing. If any pics are out there i would live to see them!

thank for all the input guys.

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A back brace IMO mainly pevents bending of the Housing under extreme acceleration, good traction and High HP applications, and some twisting of same. Does little to help the R&P tooth interface, also IMo the weakest point after
the already mentioned Driver side cap.

Not worth it for OP IMO, and fpllow my suggestion, not what I do.



See pic #43 https://board.moparts.org/ubbthreads/show...part=1&vc=1