635 diff

Post Fri May 25, 2007 7:10 pm

i know its in the wrong forum, but does anybody know if a 83 84 635csi diff is lsd? also what ratio is it? cheers

Post Fri May 25, 2007 8:33 pm

ill ask on sat if no one on here answers before then, ill be up working on a 6 then.

Post Fri May 25, 2007 10:46 pm

LSD was optional, usually a 3.07 ratio, and no it will not fit an E30 !

Post Sat May 26, 2007 12:16 pm

it fits the m3 prop with slight modification according to the engine conversion specialist i spoke to:?

Post Sat May 26, 2007 7:14 pm

anything will fit with modification.

Post Sat May 26, 2007 8:05 pm

cuzz1510 wrote:it fits the m3 prop with slight modification according to the engine conversion specialist i spoke to:?

Ask him how much, and when he can fit it, and then watch him go quiet !

Post Sat May 26, 2007 8:37 pm

cuzz1510 wrote:it fits the m3 prop with slight modification according to the engine conversion specialist i spoke to:?

No it doesn't! He's talking bollocks.

Post Sun May 27, 2007 1:32 am

roger that gents.it was fritzsbits who said it could and iv read it on net somewhere before (cant remember where though)

but if you say so......

Post Sun May 27, 2007 11:20 am

cuzz1510 wrote:roger that gents.it was fritzsbits who said it could

They ought to know better - you buy a 635CSi 210 diff and drop it off with your car for the 2 hours it takes for a straight diff swap............

A 635CSi diff WILL bolt to the E30 axle carrier because the four bolt spacings are the same. However you will need custom driveshafts because no E30 outer CV will bolt to the 635CSi diff flanges and 635CSi outer CV's will not fit any E30 drivehaft known to man. E30 diff flanges will not fit a 635CSi diff.
As well as a pair of custom driveshafts you will need a custom rear diff mount because the rear diff mounts are of two totally different types so you would need to have a special diff carrier welded to the boot floor. Then of course you will need to have a shorter prop with a 635CSi end yoke fitted. Then you will find the 3.07 ratio is completely wrong unless you have a 1:1 ratio sport gearbox.

See where we're coming from? We were all trying this LONG before Fritz Bits came along!

The only 6 Series diff that will fit is a post 6/82 628CSi unit which is the same as a 528i. No 635 or 535i units will do.

Alles Klar?

Post Sun May 27, 2007 11:24 am

Could the internals from the 635 diff be transfered over to an E30 diff?

Post Sun May 27, 2007 5:42 pm

eko wrote:Could the internals from the 635 diff be transfered over to an E30 diff?

No. It uses the big 210 diff and nothing fits as it's all too big. Forget the 635CSi diff!!

Post Mon May 28, 2007 12:37 am

haha i belive you camper

i wonder what the feck hes on about then!! cheers for sorting that

Post Tue May 29, 2007 1:33 am

Andyboy wrote:Alles Klar?

Nein, nicht Alles! Ich mÃƒ¶chte mehr Ãƒaber Ausgang Flansche wissen!

And in english: do you know what is the difference in distance between output flanges 188 vs. 210 if there is any?
I hope you understand what I mean...

Cheers,
Jan
P.S. I'm not german and my deutch is very poor (it is just easyer to work on BMW with some basic knowledge of german, isn't it?).

Post Tue May 29, 2007 4:19 pm

Yaninnya wrote:
Andyboy wrote:Alles Klar?
Nein, nicht Alles! Ich mÃƒ¶chte mehr Ãƒaber Ausgang Flansche wissen!
And in english: do you know what is the difference in distance between output flanges 188 vs. 210 if there is any?
I hope you understand what I mean...
Cheers,
Jan
P.S. I'm not german and my deutch is very poor (it is just easyer to work on BMW with some basic knowledge of german, isn't it?).

Are you for real?

Post Tue May 29, 2007 4:36 pm

what if you were fitting an m30 engine and a manual transmission from a 635 csi into an e30? Would you meed a 3.07 ratio diff?

Post Tue May 29, 2007 6:30 pm

binxy69 wrote:what if you were fitting an m30 engine and a manual transmission from a 635 csi into an e30? Would you meed a 3.07 ratio diff?

No. Only the non catalyst cars up to mid/late 1987 used the 3.07 and they were really overgeared. Cat cars used a 3.45 and the Highlines used a 3.64 which geared them up just right. 5500 rpm was 140 mph with the 3.64, so peak power comes at max speed.

Post Tue May 29, 2007 7:37 pm

Andyboy wrote:Are you for real?

Yes, absolutely. Do you know what is that difference?
Jan
P.S. No offence, but it looks like we have different sense of humor.

Post Tue May 29, 2007 8:59 pm

Yaninnya wrote:
Andyboy wrote:Are you for real?
Yes, absolutely. Do you know what is that difference?
Jan
P.S. No offence, but it looks like we have different sense of humor.

What are you talking about??

Post Tue May 29, 2007 9:10 pm

Andy what model BMW will my diff have come from?
3.46 open!

Post Tue May 29, 2007 10:17 pm

eko wrote:Andy what model BMW will my diff have come from?
3.46 open!

Show us a pic of what you have!

Post Tue May 29, 2007 10:21 pm

Andyboy wrote:
eko wrote:Andy what model BMW will my diff have come from?
3.46 open!
Show us a pic of what you have!

No pic as such,but its whats in there!

Post Tue May 29, 2007 10:56 pm

Andyboy wrote:What are you talking about??

I'm talking about 210 diff and.
From your previous posts I understood that you was trying to fit 210 diff from E23/E24/E28 to E30 rear subframe. Thats why I asked do you know the distance between left and right output flange in 210 diff. I hope that this time you will understand what I'm talking about.
Jan
P.S. English is not my first language.

Post Wed May 30, 2007 5:29 pm

Yaninnya wrote: Thats why I asked do you know the distance between left and right output flange in 210 diff.

Understood. But I have no idea, all I know is the diff doesn't fit an E30 without a huge amount of work.

Post Wed May 30, 2007 5:35 pm

I believe Fritz are developing an active ride set up for E21s , i wonder how its progressing............

Post Sat Jun 02, 2007 6:05 pm

are there any other diffs that will fit the e30 m3 prop then? having a bit trouble sourcing a 3.25 and dont wanna go near fleabay :shoot1:

Post Sun Jun 03, 2007 10:21 am

Not really. Maybe an early E28 528i diff.