Larry, the truth of it all "people have always told me that I like to over-do things" I really don't think that's possible. But I do HATE, being late for Church on Sundays..........the Priests don't like it either! 

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[QUOTE=corvette440hp]I'm refering to my vette's differential (of course). The question is on the "74", what is the rear axle called........GM 8.5, 8.75 or what? Next the pinion flange (yoke) has the 4 1/4" width to except the universal. I know that the earlier years used a shorter width. The new question is: how many teeth are on the yoke? Thanks for your attention on this. [/QUOTE] Here are the answers to my questions (if anyone is interested):       1. The rear axle is called a GM 8.2.      2. It's a 10 bolt (ring gear bolt count.)      3. It's a Series 3 Eaton Posi unit, which means it can go from 3.90, to 3.73, etc.     4. A series 4 carrier (Eaton Posi) will house 4.11 and 4.56 gears.     5. The pinion yoke spline count is 25.     6. The side yokes (also at times called stub shafts) are a 17 spline count......that connects to the 1350 universals on the half shafts. Hopefully this will help any GEARHEADS that are interested in this.     corvette440hp2008-04-16 14:55:41

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If you are going inside to build up the rear check out tomsdifferentials.com He has some bullitproof rear endstuff.From mild to wild. If you are going to push some horepower or just want to repair/strengthen the diff check him out. Can you say 12" ring gears in the diff? How about 1480 universals with their 3 1/2" axles. I put on his larger bearing cap to help hold the weakest side (left)of the C-3's diff. It uses 1/2" bolts vs 7/16" and the cap is a solid steel billet piece. It helps hold the side where the ring gear puts the most stress on the rear. No fear. They love to talk tech too.custom762008-04-18 14:36:10

[QUOTE=custom76] If you are going inside to build up the rear check out tomsdifferentials.com He has some bullitproof rear endstuff.From mild to wild. If you are going to push some horepower or just want to repair/strengthen the diff check him out. Can you say 12" ring gears in the diff? How about 1480 universals with their 3 1/2" axles. I put on his larger bearing cap to help hold the weakest side (left)of the C-3's diff. It uses 1/2" bolts vs 7/16" and the cap is a solid steel billet piece. It helps hold the side where the ring gear puts the most stress on the rear. No fear. They love to talk tech too.[/QUOTE] Thank you, You are entirely correct............Toms is the place. I didn't even know about them until I sent everything out to Duntov in Texas. They put in the 3.70 Richmond Gear Set. Loaded everything on the newer Eaton Posi Carrier. I aslo went with the air craft quality hardened side yokes that are capable of 700 hp. I also had the gears REM coated. Tom's will propable support 1,200 hp. You certainly sound like a real gearhead................thank you......there might be a few of us out there............

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[QUOTE=custom76] If you are going inside to build up the rear check out tomsdifferentials.com He has some bullitproof rear endstuff.From mild to wild. If you are going to push some horepower or just want to repair/strengthen the diff check him out. Can you say 12" ring gears in the diff? How about 1480 universals with their 3 1/2" axles. I put on his larger bearing cap to help hold the weakest side (left)of the C-3's diff. It uses 1/2" bolts vs 7/16" and the cap is a solid steel billet piece. It helps hold the side where the ring gear puts the most stress on the rear. No fear. They love to talk tech too.[/QUOTE] Thank you Phil!corvette440hp2008-04-18 16:35:06

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  The 80 to 82 Is the Dana 44 in the Aluminum C4 style housing. Funny how C3's have a C4 style Housing and its not the other way around. So do we know if Toms Diffs dose the Dana 44 ???

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My Car...PIC 1     PIC 2

[QUOTE=Gale Banks 80]  The 80 to 82 Is the Dana 44 in the Aluminum C4 style housing. Funny how C3's have a C4 style Housing and its not the other way around. So do we know if Toms Diffs dose the Dana 44 ???[/QUOTE] Rich, Tom's go all the way up to 5.89 gearing in you would ever want gears that steep. Click here for Dana: http://www.tomsdifferentials.com/catalog.asp?pg=95

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Here's another link to Duntov Motors in Texas:  http://www.duntovmotors.com/Differentials_80-82.htm

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Here is another link to check out:http://www.exoticmuscle.com/webpage.php?EMCAT=vette&MENU=SHOWPARTS&CATSEL=DRIVETRAIN

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yw 440. Let us know how you make out with Duntof. Not a bad choice either. custom762008-04-20 00:33:55

I used Duntov Motors in Texas to build the rear axle. They worked with me every inch of the way. I spoke with the owner, Alan numerous times. They sent a bullit proof shipping crate for me to sent my axle to them. I upgraded many items. They bought many of my original parts. That reduced my costs quite a bit.  I was going to do the work myself, but after I spoke with Alan, I didn't thing that it was wise for me to go that route. The prices include shipping.  

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