rear end In or Out - United Bimmer Community

**sbcBMW305v8** · 08-13-2006, 04:33 PM

hey my name is nick and im kind of new to the site
i drive a 1987 bmw 325
and im going to be dropin a 450 horse sbc into my car and i am wondering if the stock rear end is going to hold up because i hate breaking parts

witeshark · 08-13-2006, 04:45 PM

If you're gonna use the power, you need a new rear diff

**xsperf** · 08-13-2006, 04:57 PM

wait, dont you already have it in there? or is this a different one? .. either way, you may want to replace your subframe, however i know many people turbo their e30's and have produced much more than 450HP, however i dont know what kind of modifications they have done to it though

**sbcBMW305v8** · 08-13-2006, 05:48 PM

thanks for the replys i thought i needed a new rear end
yes i am putting a different motor in
it is a 307ci sprint car motor ALL MOTOR ON PUMP GAS
im sure turbos make more horsepower but i am only 17 years old and this is my high school daily driver car

**sbcBMW305v8** · 08-13-2006, 05:54 PM

my next question is Does BMW make any aftermarket rear ends that will handle the horsepower or should i just find a ford 9"???

witeshark · 08-13-2006, 06:11 PM

Maybe the M cars have one that can, but I bet the Ford diff is easier to find

**Antiburn** · 08-13-2006, 06:58 PM

Leave the diff in there. if it blows then put another one in.

www.metricmechanic.com offer a variaty of limited slip diffs

**Chris** · 08-13-2006, 10:42 PM

i'm sorry but ford in a BMW? no thank you.

The only reason i like the LS1 swap is because its lightter wider and lower to the ground so it makes sense.

I just can't aggree with a ford engine in a bmw.

witeshark · 08-13-2006, 11:17 PM

The engine is not a Ford, the diff in the back axle may be. sbc = small block Chevy

**Chris** · 08-13-2006, 11:22 PM

if your'e gonna get a small block chevy go get a ls1 or a ls6. i would imagine they'd be about the same price as a new small block chevy engine.

**sbcBMW305v8** · 08-14-2006, 08:58 AM

i already built up the small block chevy i just need a different rear end now because i dont think the stock rear end will work

and trust me i would never ever ever ever ever go with a Ford engine they just now how to build good rear ends

Ford= F*cked Over Rebuilt Dogde

**curtishead** · 08-14-2006, 09:10 AM

Get a Ford 9" rear-end and start working on it so it'll be ready. There goes your independent rear suspension. Actually, too much more of this kinda' mods and you're gonna be in the wrong forum/site/hobby.

**xsperf** · 08-14-2006, 11:27 AM

i think the Z3 roadster(or the M roadster) has a reinforced subframe, just like antiburn said, i would just replace those, and nothing else, and if something breaks,t hen thats wat you need to fix

**RealBmw 02** · 08-15-2006, 10:40 AM

Don't go with a Ford 9". You will trash the handling of the car since it will be a solid axle instead of IRS. Not to mention the extensive work that will be neccesary to make it fit properly.

**curtishead** · 08-15-2006, 01:24 PM

'02's right. leave the IRS in there and try to find an original motor. I think it takes more of a wrench to restore a car than it does to cobble together a hotrod.