Awesome. A new noise!

XR4Ti / Sierra / Sierra Cosworth Discussions - Questions, problem resolution, general talk, technical tips and modifications.
thesameguy
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Re: Awesome. A new noise!

Post by thesameguy » Wed Jan 08, 2020 11:49 am

I'd reckon billet is what it's made from, the production ready raw material. Once it's been carefully machined and precision drilled it becomes a chunk.

Ed Lijewski
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Re: Awesome. A new noise!

Post by Ed Lijewski » Thu Jan 09, 2020 3:12 pm

Your post. Your call.

Most prefer billet from start of machining to completion. (Although Chunk as in Chunk Todd of NBC works well...).

YMMV
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thesameguy
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Re: Awesome. A new noise!

Post by thesameguy » Thu Jan 09, 2020 4:34 pm

Speaking of billets of aluminum, anyone purchased from https://www.onlinemetals.com/ or similar? Working on my 17mm driveshaft yoke spacer. My preferred machine shop has graciously agreed to turn a billet into a chunk for me.

Edit: Midwest Steel and Aluminum ( https://www.midweststeelsupply.com/ ) was a better option... Online Metals minimum size was 10"x24" but Midwest offers cuts, so I ordered three 5x5x1 plates to be cut down to a ~4.5"x3/4" round. I only need one, but I don't want to be short material in the event something goes wrong in production. For $12ea, it's cheap insurance.

I'm going to have Driveline Service extend the FMS AL DS by 21mm, then use this new spacer to take up the space the MDL adapter would if I was using a later transmission with the longer input shaft. Then if/when I decide to upgrade the trans, I just install the MDL spacer and take out my DS spacer. Easy!

thesameguy
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Re: Awesome. A new noise!

Post by thesameguy » Mon Jan 13, 2020 3:11 pm

Well, I've backed myself into a corner.

If I replace the diff with an LSD-equipped one, I'm building it from a low-miles 3.64 diff that I already have out.
If I replace the diff with a lower ratio, I need to replace the transmission as V6 trans and 3.36 diff sounds like No Fun
If pull the transmission to change the clutch, I'm not putting the old gearbox back, I'm putting a V6 trans in

So, like I HAVE TO do the trans, diff, and LSD all at once. Like, have to.

I ordered The Tool from MC2 to help take my spare diff apart, so I guess I'm going down that road.

my8950
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Re: Awesome. A new noise!

Post by my8950 » Mon Jan 13, 2020 7:44 pm

thesameguy wrote:
Mon Jan 13, 2020 3:11 pm
I ordered The Tool from MC2 to help take my spare diff apart, so I guess I'm going down that road.
You going to use the GM diff?

thesameguy
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Re: Awesome. A new noise!

Post by thesameguy » Mon Jan 13, 2020 7:59 pm

Yeah, I don't have the energy to even consider a Supra or 8.8 swap. Just not worth the cost and energy for what I'd get out of it. The Detroit diff is a great solution for a street driven car, and should do everything I want it to do handily.

my8950
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Re: Awesome. A new noise!

Post by my8950 » Tue Jan 14, 2020 9:18 am

thesameguy wrote:
Mon Jan 13, 2020 7:59 pm
Yeah, I don't have the energy to even consider a Supra or 8.8 swap. Just not worth the cost and energy for what I'd get out of it. The Detroit diff is a great solution for a street driven car, and should do everything I want it to do handily.
I am curious about doing one as well, it just isn't clear to me the grinding of the case and how the install really goes.

thesameguy
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Re: Awesome. A new noise!

Post by thesameguy » Tue Jan 14, 2020 12:26 pm

I spoke with Christopher Grayson about that, because I wasn't clear either. I was concerned that there was some specialized knowledge about where and how much that you simply had to magically know. But, the grinding occurs solely so you can physically rock the diff into the case. The case grinding occurs on the rear flange, where the cover mates, and you just take a little at a time until the diff slips in. Easy! It's apparently possible to build the diff inside an unmodified case - but nobody knows how to get it back out again. :) If you go to mc2racing and click on Tech there is a step by step of the installation... I'm dense and needed some more clarification.

1. Dismantle diff
2. Send side adjusters to mc2 for rehab
3. Purchase install kit (new bearings, etc.) and diff from mc2
4. mc2 sends an assembled diff back
5. Grind case
6. Install diff

As soon as I get the removal tool from 'em, I'll start on step 1. :D

my8950
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Re: Awesome. A new noise!

Post by my8950 » Tue Jan 14, 2020 1:29 pm

thesameguy wrote:
Tue Jan 14, 2020 12:26 pm
I'm dense and needed some more clarification.
I can't say that I'm any different....
Take photos!

thesameguy
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Re: Awesome. A new noise!

Post by thesameguy » Tue Jan 14, 2020 2:29 pm

I'm likely at least a month out, but I definitely will.

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