Springfield Flyer.

[tauruck]

Non productive day in a sense.

Got mountains of stuff to get through but had to repair a damaged door mirror
on the Chevy Spark. The little lady that lives here should have gone high but chose to
stay in her lane near the yellow line and took out a garbage can. Some dude left it on the verge
and a truck clipped it sending straight for the Chevy. Think I got it done. We'll see how it turns out in the AM.

Got a bunch of bolts from SA Bolt Friday. Great quality and as ordered. Thanks Rensia and Paul Cameron.
My other 5 coils arrived from Bosch too. Now I can mount them and store them for later.

Got it pretty good here. Most of my sponsors are east of Johannesburg and it's a PITA driving back and forth all the time.
My old girlfriend works in the heart of the industrial area so she collects all the goods for me during the week and I get them
Saturday morning along with breakfast. Staunch supporter she is and her unofficial title is team secretary!!!.

I have some GM 8.5 10 bolt ratios at the gear cutter. He's manufacturing some 2:1 sets and as soon as I have pics I'll post them.
Geraldo has a length of EN19 round bar that he's turning for the front tandem steer system. I'm ordering extra on all components
so i'll have spares for in case.
Also bought a box of 10 x 2mm drill bits so I can start drilling bolts for locking wire.

[SPARKY]

I am going to be interested in seeing you guys are going to get the 2.0 in the housing   

[tauruck]

My thoughts exactly. The guy says he can. Sparky, lets wait and see.

https://www.youtube.com/watch?v=x8SXT9iMY1U

Sparky, see above. That's the machine.

[tauruck]

I just found out my GM 10 bolt 8.5 rear end is a 7.5 !!!!!!!.

I think?.

[floydjer]

Think I`ll go beat my Index 745 to death with a hammer now.................

[tauruck]

Jerry don't be so hard. Some guys wish they had that mill.

[kiwi belly tank]

You better be on the hunt for an 8.5 housing Mate!
  Sid.

[SPARKY]

or a 12 bolt which is a 8. 875

[tauruck]

You better be on the hunt for an 8.5 housing Mate!
  Sid.

After all work I put into the current one??.
I thought one of you guys would have wised me up way back?.
Right now I'm not working on the project. Too dejected.

[tauruck]

Some pics of my coil packs.
Thanks to Xola from Bosch.
You rock Bra!!!!

[tauruck]

Loctited too!!!.

[jacksoni]

Mike- what did your differential come out of?-And year? Are any of the serial numbers still in place? I assume you have changed the bearing retainer as what is on it is not GM, certainly not 7.5" rear. The Mounting rings on the top were also older car suspension. Most of the 7.5 stuff I have seen had torque arm or similar mounts. Besides actually measuring, there are some other identifiers available on line such as these:  https://www.bing.com/images/search?q=GM+12+Bolt+Axle+Identification&view=detailv2&&id=121D07F064092B4F814B29309E5FCD1C8D8E6E3A&selectedIndex=0&ccid=ji2oWTRZ&simid=607994484956332139&thid=OIP.M8e2da859345968f7f2518bf4bfedbd5aH0&ajaxhist=0

As the cover is different.

Certainly if it really is a 7.5 I can understand depression considering all your work.

[jacksoni]

This site has considerable identification information as well as cars/years that the various rears came from:

http://www.drivetrain.com/parts_catalog/ring_and_pinions/gm_7.5_ring_and_pinions.html

[tauruck]

Jacksoni, my friends here suggest at 10 bolt 8.5 rear end.
I had no idea what it looked like but because I live in South Africa
I never expected to find one. First guy I called said he had one for me
so I picked it up thinking it was an 8.5. I have no idea what car it came out of.
I was measuring the crown wheel last week and that led to the discovery
that I had a 7.5. Upon checking I saw on Google that the 8.5 has a round cover etc.
I'm stuck with what I have and the dude I got it from isn't answering my calls.
Subaru happens I guess.

[jacksoni]

OK. I didn't see a photo of the cover so not sure. Just looking at the housing, I thought likely older which would suggest is not the 7.5. I assume your measurements across the full diameter of the ring gear (crown wheel?) are correct. The problem of course is strength. High shock loads as in drag racing the small ones don't tolerate. LSR- salt/dirt etc, don't have that usually but a lot of power still is an issue. Using the best parts for R&P, spool, axles etc might allow it to live. Speak with your guys with that really fancy CNC machine ( WOW)about those issues. They may have some advice.

http://www.demandaam.com/technical-support/aam-technical-tips/to-determine-ring-gear-diameter
Can you post a photo of the back of the diff with the cover on and off?

Good luck.