ix turbo gears

[yellow325ix]

Anyone changed gear ratios after a turbo install? I'm running strong but seems like they need to be longer. Advice?

[The Dark Side of Will]

Euro market iX's came with 3.64 gears. The hard one to get is the front, of course. Watch www.ebay.de and set your search area to Europa.

A couple front diffs have been offered for sale here over the years.

[yellow325ix]

do most people change after turbo charging or stick with stock?

[nando]

I think a lot of people just have the 3.91s because they are easy to get and they already have them. I will want 3.64s for my new motor but I haven't even looked for them and I know it will be tough to find..

[TehRaydarlover]

I bought a 3.64 front diff off ebay.de and USPS lost the damn package, pretty much cemented my hatred for them.

[nando]

Just did some searching and it seems pretty hopeless.

There were a few that were marked as 3.91's on ebay.de that could possibly be 3.64s, but even if they are - they have 300,000+kms on them and look beat. All of the internal parts are now NLA, and if you get one there's no guarantee it'll be in working condition, and you probably couldn't rebuild it even if you wanted to.

[The Dark Side of Will]

Bearings and seals ought to be pretty standard. If you have an extra diff around, pop it apart and see what bearings are in it. Gears are very very very difficult to wear out or damage.

Unless you're going with E34 or E53 front drive assembly.

[nando]

Well for one, the crush bearing is NLA. Maybe you could find one aftermarket, but it would be a pain.

parts for the E34 are also NLA and BMW has never sold internals to anything newer.

[downforce22]

there are a few sets floating around but I snatched up the first 3.64 front I found and posted the last one I saw. Finding a Viscous rear 3.64 would be tougher than the front I think.

[The Dark Side of Will]

A viscous 3.64 rear can be built easily enough. The parts are all on this side of the pond, one just has to put them together. I have one... with an E36 rear cover, even.

The problem with the 3.64 front is that the critical parts never made it to North America.

[TehRaydarlover]

Well for one, the crush bearing is NLA. Maybe you could find one aftermarket, but it would be a pain.

parts for the E34 are also NLA and BMW has never sold internals to anything newer.

I bought all of the parts to rebuild one a year or so ago. You can still get the bearings, I bought mine from Motion Industries $48.90+shipping. You actually have to buy the cup and cone halves separately, here are the part numbers:

Timken
Cone - Cup
M88048 - M88010
M86649 - M86610

OEM is FAG brand but Timken or SKF are acceptable equivalents

[downforce22]

I bought all of the parts to rebuild one a year or so ago. You can still get the bearings, I bought mine from Motion Industries $48.90+shipping. You actually have to buy the cup and cone halves separately, here are the part numbers:

Timken
Cone - Cup
M88048 - M88010
M86649 - M86610

OEM is FAG brand but Timken or SKF are acceptable equivalents

Did you ever build it? What about the gears? What else would you be missing?

[TehRaydarlover]

I have not built it yet but it's in the works haha. Here's my parts list:

31531210929 x 2
33131212693 x 8
31531210746 x 2
31511211113 x 1
33113604119 x 1
33121210295 x 1
31511210884 x 1
33121200259 x 2 (you only need one, but odds are you'll screw up the rolling torque the first time so it's good to have a second one on hand)
33113604119 x 1
31521212516 x 1
23211490120 x 1

As far as the gears go mine were still in good shape. You can still get them new but they are $170 for the side gears and $90 for the spider gears. ECStuning actually says the 3.64 gear set 31521211702 is in stock lol $400 worth a try!

[DrMcDave]

I had and sold a set of 3.64's a few years ago when I decided not to boost my IX. To some degree I wish I couldn't have sold them.

[nando]

Dave long time no see - I had thought of you when the subject of 3.64s came up. Pity you sold them, I would love a set..

you know they are sort of rare when you know the names of individuals who have them. lol.