Beefing up a (broken) 9 Bolt rear end. HEELP!
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Junior Member
Joined: Nov 2007
Posts: 38
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Beefing up a (broken) 9 Bolt rear end. HEELP!
Hi guys, I’m not trying to make it easy on myself, I just don’t know anything about rear ends so I need lots of help.
PROBLEM: Broken 9 Bolt 2.77 rear end (something broke inside, I don't have means of actually checking what broke but wheels are stuck going forward, do go back).
WHAT I NEED: To rebuild it with strongest parts possible to handle some serious power (hopefully it would handle at least 400 hp if such rebuilt is possible).
I read this artice: Beefing Up the 7.625 10 Bolt here: https://www.thirdgen.org/beefinguprear
Essentially I would like to do the same thing to my 9 Bolt, rebuilt it very strong but I need the list of parts for the 9 bolt just like kwikgta listed for his 10 bolt, part numbers, any additional parts I would need (I know I will need new gears cause I want strong ones and either 3.42 or 3.73 not sure yet). And of course where to buy all this.
Thank you all in advance. Please keep in my I know nothing about rear ends so please list all parts I need even if you don’t know part numbers. I would like to use my current brakes (got discs in the rear).
I am stressing so much that I need a complete list of parts because my plan is to buy all parts and then tow my car to a mechanic, give him parts and not have a headache of him telling me that I'm missing something. I also need a good posi, so please include info on a good strong one too.
Again, I know I'm asking for much but I will greatly appreciate any help.
PROBLEM: Broken 9 Bolt 2.77 rear end (something broke inside, I don't have means of actually checking what broke but wheels are stuck going forward, do go back).
WHAT I NEED: To rebuild it with strongest parts possible to handle some serious power (hopefully it would handle at least 400 hp if such rebuilt is possible).
I read this artice: Beefing Up the 7.625 10 Bolt here: https://www.thirdgen.org/beefinguprear
Essentially I would like to do the same thing to my 9 Bolt, rebuilt it very strong but I need the list of parts for the 9 bolt just like kwikgta listed for his 10 bolt, part numbers, any additional parts I would need (I know I will need new gears cause I want strong ones and either 3.42 or 3.73 not sure yet). And of course where to buy all this.
Thank you all in advance. Please keep in my I know nothing about rear ends so please list all parts I need even if you don’t know part numbers. I would like to use my current brakes (got discs in the rear).
I am stressing so much that I need a complete list of parts because my plan is to buy all parts and then tow my car to a mechanic, give him parts and not have a headache of him telling me that I'm missing something. I also need a good posi, so please include info on a good strong one too.
Again, I know I'm asking for much but I will greatly appreciate any help.
Senior Member
iTrader: (1)
Joined: Jul 2007
Posts: 1,141
Likes: 2
From: MA
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: Beefing up a (broken) 9 Bolt rear end. HEELP!
Parts availability for the 9 bolt is a problem. You're not going to find all the aftermarket stuff you see for the 10 bolt. This link will help:
https://www.thirdgen.org/forums/faq-...now-about.html
I'd guess your spider gears are toast.
https://www.thirdgen.org/forums/faq-...now-about.html
I'd guess your spider gears are toast.
Supreme Member
iTrader: (7)
Joined: Nov 2006
Posts: 3,740
Likes: 15
From: Alamogordo, NM
Car: 88 Formula 350
Engine: 5.7
Transmission: T-56
Axle/Gears: 9" 3.89
Re: Beefing up a (broken) 9 Bolt rear end. HEELP!
I have a set of 3.45 gears for sale, as well as a spider gear set. $110 obo Shipped.
Senior Member
iTrader: (1)
Joined: Jul 2007
Posts: 1,141
Likes: 2
From: MA
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: Beefing up a (broken) 9 Bolt rear end. HEELP!
Be aware that 3.xx gears won't fit on your 2 series carrier.
Supreme Member
iTrader: (7)
Joined: Nov 2006
Posts: 3,740
Likes: 15
From: Alamogordo, NM
Car: 88 Formula 350
Engine: 5.7
Transmission: T-56
Axle/Gears: 9" 3.89
Re: Beefing up a (broken) 9 Bolt rear end. HEELP!
That is correct. You will need a 3 series carrier, which I have, but the posi is worn. I can include all the internal parts.
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