Well, just keep in mind - They may not be designed for that kind of stress, there's NO reason for it. Whether it can take it or not, I guess you found that out - 3 times over.

You might want to think about a couple Ford 9" third members, they will take abuse. I used those without ANY problems w/44" GH's in an 89.

We all live and learn - emphasis on "learn"

 

i dont think downshifting is that hard on the rear end at the mentioned speeds. rather i think its harder on the u-joints and companion flange and the slipyoke.

as far as neutral slamming or whatever their term was, bull****. i personally think that will eat a trans before a set of bolts back there. those bolts are designed for some real good tensile strength for a reason. i do not and will not replace them with grade 8 bolts, i will continue to pay $3.30 a bolt for those particular bolts. i believe they supply grade 8 bolts?

 

my last 2 rearend blew out because the power of the motor took out the gears over time... they start wearing and then get weak and chip...
O and the fact there cheap gears

this time was not like the others... this was a installers error or a defective part..

the limited slip/the whole chunk deal... is bent.. i was going to weld it today "ring/limitedslip" but me and my buddy both know that the gears
would be shot by tomarrow... so no point...

My buddys going to lend me a ford 9 to put in so i can get around untell i can
find a 9.75 to rebuild.

And moneys not a problem just i invest my money and i dident think
i would end up spending as much money as i have in the past month.

As for the bolts im not sure if they are grade 8 or higher....
but 5 of the bolts broke... the rest came out befor it broke

O ya and i have a feeling that the bolts were bending back and forth befor they snaped...
stress facter on bolts..... i think it makes sence

 

Yea , you'll prolly be alright with a 9.75 in there. They go even taller 10.? in the 3/4 & 1 tons come to think of it. - Probably for good reason.

 

they have lightningz running 600-1000hp with the 9.75 so i dont feel i need to go bigger...

i want to do as less fabbing as i can

plus if i go to a 8 lug i will have to get new rims or spacers and to make my 5x135 go to 8x*** would cost like a grand... the spacers cost alot..
But converting from 8 to 5 might not cost to much....

 

whatever mann , do what you want. I think the 9.75 would be better all around - That's what is speced for the 5.4L. You should put what belongs behind - to handle that torque. But that's to obvious I guess

 

Downshifting into 1st at 25 mph? Are you crazy? Heck I downshifted into 1st at 7-8 mph and the engine immediately slows me down to a crawl.

Also, please learn how to spell, I don't want to waste my time trying to figure out what you are saying.

 

I was going to say something about that - figured I was giving him enough hell

 

I'm hip.

 

uh dont weld carrier to pinion... if you do anything with a welder in the rear regarding the ring gear, you just tack the bolt heads so they have to break welds to back out.

your a step ahead of me, my 8.8 is still kickin so im still running it. go for the 9.75 its pretty similar to a d60 rear.

 

OMG this is the most painful thread I have ever read!!

 

^^^ lol Thats kinda why i just stopped.

Don't worry, if ya try, you can find even better !!

 

this thread is funny because i know what happen is not my falt...

i started this to ask a simple question.
What could snap or brake inside the rear end at once..

But then people started saying learn how to spell and saying things like
thats what u get for downshifting...

Auto downshifting will not left you downshift to soon...
manual trans do the same thing...

people dont care

 

True, what do I know anyway ???

Its not all what your saying, just kinda this thread in general. Not a personal attack bud, by any means. I couldn't care less on spelling and what not.

 

All good i get my wiz teeth pulled in the morning...

im mainly happy the 8.8 is gone and i got a 9.75 in there now