Old Blue 2002 (1974 BMW 2002 Content)

[SkiFree]

Yeah thats what most people do when they do an m20 swap.

Are your purchased mounts positioning the 260 tranny so the shifter platform has to be moved? It'll change sure, but not drastically.

Much rather do the E21 323 transmission and not hack up the tranny tunnel/etc. Considerably cleaner and largely plug and play. Still can be found cheaply if you are patient. Hope things are progressing smoothly for you.

PS if you wanted a SoCalVintage Tshirt let me know, John usually has a few left over to sell.

[deutschman]

Well I am in San Rafael right now. Just moved.
Is the 2002 in Daly city gray and very low?

[Will_318i]

nice car man. where in SF are you located? for a second i thought you were a 2002 I see in Daly City in the mornings by the Bart station. Have you seen that 2002 around?

[deutschman]

Make one yourself out of a sheet metal e30 console

Yeah thats what most people do when they do an m20 swap. You have to cut the metal shifter plate up and shorten it to bring the shifter closer to the front of the car. Other wise it is to fare back.

[kronus]

Make one yourself out of a sheet metal e30 console

[deutschman]

Ooooofff! I just found something that is dangerously tempting. The AKG DTM short shifter, shifter plate, and selector rod. I want.

[deutschman]

Always happy to help it's nice to have a car to work on. Kinda bummed you don't need that spacer in the end, was looking forward to making use of my CAD skillz and warming up the plasma cutter! Sure I'll have another chance soon, your car seems to be in never-ending need of something custom :)

Yep. Ill come up for something for you to draw and cut.

[mr2peak]

Always happy to help it's nice to have a car to work on. Kinda bummed you don't need that spacer in the end, was looking forward to making use of my CAD skillz and warming up the plasma cutter! Sure I'll have another chance soon, your car seems to be in never-ending need of something custom :)

[deutschman]

What makes this even sweater is that all the parts were free!

Nice job figuring it out today! Also can't believe we survived without an impact wrench for so long.

Thanks so much for helping James. It is always good spending time with you man!

[deutschman]

Are your gear ratios the same on both diffs? I know that you can do what you are trying to do but don't know the details. You may need to use the e30 ring and pinion in the 02 case and i would recommend keeping the ring and pinion gears matched anyway. There is more than one way the gear teeth are cut (they dont interchange) even among different year 2002s.

The gear ratio is 3.64:1. Currently the case houses the e30 LSD pumpkin with a matched set of 3.64:1 2002 ring and pinion gears.



It works really well now. I just switched the ring gear (crown gear) from the 2002 diff onto the e30 LSD pumkin. Now there is a mached set of 3.64:1 ring and pinion gear in the diff. All I need is a new baring (we had to bust one today), and some new seals. I am super stoked! :D

[mr2peak]

Nice job figuring it out today! Also can't believe we survived without an impact wrench for so long.

To the rest of you: if you don't have one, get one. Especially if you need to do something like this.

[LJ851]

Are your gear ratios the same on both diffs? I know that you can do what you are trying to do but don't know the details. You may need to use the e30 ring and pinion in the 02 case and i would recommend keeping the ring and pinion gears matched anyway. There is more than one way the gear teeth are cut (they dont interchange) even among different year 2002s.

[deutschman]

I am going to swap out the ring gears. I think the 2002 gear grooves are a bit shallower then the e30 ones.

[deutschman]

I started working on the diff project. I am having way different problems then I thought I would have. It turns out that I do not need a spacer for the diff cover at all. That part fits fine.
The problem I am having is getting the LSD pumpkin properly situated in the case in a way that the crown gear from the LSD makes contact with the gear from the input shaft in the correct way. I just cant seam to get it situated correctly.
Here is the small case e30 LSD pumpkin in the 2002 diff case.

The old 2002 open gears.

So here is a picture of the drive flange the way it is spaced out.

If I tighten this drive flange down any more the diff binds up and will not turn anymore. This leads me to believe that by doing so, I am pressing the crown gear from the LSD unit and the gear from the input shaft together way to much, which makes them bind up. I messed with the spacing on this side and this seams to be just right. Any more space and the gears do not make enough contact, and any less space and the bind and don't turn.
On the other side the drive flange is all the way in and flush with the diff housing. This is a problem because the baring from the on the LSD unit is not sitting in the out put shaft seal properly which is resulting in the LSD unit not being held in place properly and messing up the contact between the crown gear and input shaft gear.
Here are some videos.
If I put the diff up on its side, with the spaced out out put flange up, and turn the diff from the input shaft it sounds and works well.

How ever if I put the diff right side up and turn the diff from the input shaft it makes all kinds of bad noises.

I just cant get the LSD unit to sit in the case snugly enough so that it does not move in unwanted directions, and in a way that the two gears contact each other in the right way.
I feel like I am just going to have to keep messing with the spacing of the drive flanges to get the LSD unit situated correctly.
If anyone has any history with building diffs please chime in!

Cheers!

[samiam3356]

Thanks