hey guys, im noob at diffs so please help me out. its almost time for me to start collecting differential/ suspension parts for my project. ive noticed a few people running 9inch diffs with the suspension moved inwards. like a 4link i guess. why do they decide to use a 9inch diff instead of rebuilding/ strengthing the standard vl turbo diff. my car has bar work in the boot for the suspension to be moved inwards, so obviously i want to use it. [/COLOR] the car is being built for show/strip. producing around the 600hp mark. so what diff do i buy/ build ?? what else do i need to fit in a 9inch diff, does it need to be shortened? different mounts welded on? zak. Some original photos have not been recovered yet.

Depends what 9" diff you use... It also depends wether or not your going to run slicks

ill do some research tonight and post up some more details after that i guess. cheers

9 inch are the strongest of strong man

lol, whats the main type of 9inch diff housing people use?

One of the main reasons 9's are used is they are easier to repair than a 12bolt chev when you are on the side of the road or at the track. They are far from the strongest differential in standard form BUT with the host of aftermarket parts that are available for them, they can be built up to be. Generally start with an aftermarket Currie's (or other) boxed housing, strange gear set, full floating billet axles and yoke, and all that left from the original fffff ord 9" is the breather tube.

I've heard of a few reasons, one in particular is the belief that BW78 (standard VL diffs) have a fairly weak pinion, which doesn't do so well in drag/hard launch applications. I also heard that billet pinion/gearsets are available, but I never looked any further into it. There are a LOT more parts available for the 9", as it's a very widely used diff in the US, and has remained unchanged for many years across a lot of different vehicles. It is a heavier diff than the BW78, which is probably why they're so strong. They also come apart in a different manner, which makes them easier to work on; as mentioned by bachig24u.

good points, Although the stock VL diffs last when used with an Auto (no trans brake), with 28 spline billet axles with a mini spool.. Good for atleast 500HP. I haven't seen them do more than that as the cars I've come across will go to larger diff and stronger suspension setup when pushing past the 500 pony mark. You just don't risk a blow up at 200+km/h. Has anyone else pushed the VL diffs more? like to know. Do the suspension mounts on the body start to tear off? trailing arms bend etc?

Availability of parts, from centers, diff housings, ratios and axels. They are strong but bloody heavy aswell. Suspension is moved inwards to allow for larger tubs and therefore tyres.

doesnt the Karam race car run a bw? its in the 8s, would love to know the specs on this if they're available

So what type of 9 diff housing should I be looking at? Or it doesn't matter.. As their all more or less the same?

Isn't that diff shop with the 2JZ vl calais that does 8s or 9s from over wa ? Phil Purser i think his name is . He should be able to set you on the right track . People forget that the diff centres are so much easier to change on 9 inch diffs . The range of ratio's available for them is crazy .

put a properly built 9' in m8 and u wont have to worry bout it again....

Quote: Originally Posted by zaksvl [View Post] So what type of 9 diff housing should I be looking at? Or it doesn't matter.. As their all more or less the same? Get a professional to build you one and that way you'll get one that is square if they use a jig. There's some dodgy 9 inch conversions out there where they cut your BW centre section out and replace it with the 9 inch centre... so you're still running the same tubes. It's an old way of doing it but doesnt always work as things dont always line up perfectly. I've spent thousands building 9 inches and next time I'd go to a shop and get a brand new housing and everything made. Best thing about a 9 inch is the centre unbolts as a complete unit and drops straight out of the housing and you can easily repair, replace or change ratio's.

I know Di Fillipo build sheet metal 9" diff housings, but just found this website http://www.pro9.com.au/index.php?PCID=10719

Aren't you still running a BW78 Jas?

Quote: Originally Posted by PROGMH [View Post] Get a professional to build you one and that way you'll get one that is square if they use a jig. There's some dodgy 9 inch conversions out there where they cut your BW centre section out and replace it with the 9 inch centre... so you're still running the same tubes. It's an old way of doing it but doesnt always work as things dont always line up perfectly. I've spent thousands building 9 inches and next time I'd go to a shop and get a brand new housing and everything made. Best thing about a 9 inch is the centre unbolts as a complete unit and drops straight out of the housing and you can easily repair, replace or change ratio's. thats what i was thinking of doing, id rather spend abit more and get someone to handle the situation for me, as they would obviously know what is needed etc. and all the good parts to suit my build. i was thinking of calling up cronic customs here in wa to have a chat to them about it. i can just see myself getting way out of hand, and end up going mini tubs and a new sheet metal boot floor haha... ---------- Post added 06-10-11 at 14:52 ---------- http://croniccustoms.com/builds/xd-burnout/

Quote: Originally Posted by Epitaph [View Post] 9 inch are the strongest of strong man Thats exactly what I got one, havent broken a diff since! Doesnt mean it wont happen cos it will but wont happen no where near as much

Quote: Originally Posted by 5spdvl [View Post] Aren't you still running a BW78 Jas? AS in me? Ive got a 9 inch now, 35 spline with a wavetrac center, supposed to be same as a tru trac, but its not really working as well as I had hoped, got to tighten it up, pretty much lock it.