Differential parts compatibility - DISCUSSION

[cooljess76]

It is a limited slip diff. You can see the difference here:


However, if it's from an e36 coupe or sedan, it will not bolt up to the ti:

[mreroc]

Read through this thread and just want to make sure I am reading right...good chance I am not as still learning under the car. I have a 96 auto, so would want to swap for an LSD from an auto; an e30 with a small case sounding like the easiest. Not buying this one, but this is essentially what I'm looking for?: http://www.ebay.com/itm/BMW-e30-e24-...item4cfdc1460d

Thanks.

[vwmikel]

Originally Posted by mreroc

Read through this thread and just want to make sure I am reading right...good chance I am not as still learning under the car. I have a 96 auto, so would want to swap for an LSD from an auto; an e30 with a small case sounding like the easiest. Not buying this one, but this is essentially what I'm looking for?: http://www.ebay.com/itm/BMW-e30-e24-...item4cfdc1460d

Thanks.

Since it says that was from a 325i, it would be from a 6 cylinder car and therefore a medium case diff. A small case diff would come from a 4 cylinder car.

[mreroc]

Right, right. Thanks for that heads up. Figured I miss something even though the info was right there.

[volgapower]

anyone ever tried the polyurethane diff bush?
i can make solid rubber one, or urethane or whatever.
what are pros and cons?

[spidertri]

Whatever material you use for the diff bushing should also be use in the subframe bushings. Stiff diff bushing with sloppy subframe bushings would probably lead to the diff mount welds tearing.

Randy Forbes does the diff mount repair when it tears on Z3s and he recommends urethane subframe bushings with a stock M coupe diff bushing.

[maverick]

Originally Posted by spidertri

Whatever material you use for the diff bushing should also be use in the subframe bushings. Stiff diff bushing with sloppy subframe bushings would probably lead to the diff mount welds tearing.

Randy Forbes does the diff mount repair when it tears on Z3s and he recommends urethane subframe bushings with a stock M coupe diff bushing.

The above does make sense really as the different levels of movement would likely cause troubles.

My question is this, I got one of the Motorsport finned covers I am planning to use on my 188 diff as soon as I finish it and I bought it used for a very good price with a like new urethane bushing in it already. I was told it was an AKG bushing and it is supposed to be an 80A durometer urethane and I believe it is a purple color which is supposed to be a street compound. I am planning on doing the subframe and swing arm bushings as well and wonder which might be best anyway but am thinking the PowerFlex purple ones, would the be compatable do you think with the diff bushing I have or should I replace that as well?

I wonder if I should use urethane at all and just use stock rubber all around? Is there any better than other stock parts that can be used? Is good urethane better?

I like a taught car and don't mind a bit firmer feel as I am running TC Kline D/A's front and rear with 400lb front and 500lb rear springs so firm but not hard so I like compliant and not stiff. Any suggestions as it looks like I may start this project sooner than later and one other thing is I am likely going to have to tackle most of the work alone so ease is a factor.

Thanks
Dave

[volgapower]

the weld on the floor got torn, welded today...
but both subframe and diff bushes are out of order.
can this lead to vibrations from the rear while accelerating?

[volgapower]

here is part number of my diff...
i found it after removing the cover
4061004301 i think its a ZF part number
but i can not find out what tipe of LSD it is?
clutch, torsen, visco???

and what type of oil it requires?

here is the picture

image hosting jpeg

[cooljess76]

Originally Posted by volgapower

here is part number of my diff...
i found it after removing the cover
4061004301 i think its a ZF part number
but i can not find out what tipe of LSD it is?
clutch, torsen, visco???

and what type of oil it requires?

C'mon man. I just posted this IN THIS VERY THREAD a couple weeks ago:



75w-90 with LS additive.

[volgapower]

yes but on the lifted car
if i turn one wheel, the second makes no move

on cluch type lsd, both wheels spin same direction...
thats why i am confused

[cooljess76]

Originally Posted by volgapower

yes but on the lifted car
if i turn one wheel, the second makes no move

on cluch type lsd, both wheels spin same direction...
thats why i am confused

It doesn't always work. Are you spinning the wheel forward?

[volgapower]

i tried both directions

[Michael_M]

CoolJess
You mentioned with 6cyl swapped engines people use ZF Tranny? I was somehow planning to swap my engine with M52b28 and I was going to mate it with my current tranny (Getrag), will that be alright? and the propeller shaft should be good? also planning to do 2.93 LSD as I drive a lot on the highway and mainly I use the car as a daily drive than autocrossing!

Any Advices for that?

[Fuzzy Nutbucket]

I believe it "should". I did an S50B30 swap with the same Diff as you (and e30 6cyl. axle half shafts) But i did take my drive shaft in and have it shortend an inch as well, he also balanced it. Still good a few years later.