632C2

I recently got my 12-bolt differential conversion back from Mike Dyer(tracdogg2). This will be going in my red '67 convertible that I am putting a big block in. I was concerned about the strength of the factory diff so a Tom's was in order. I decided on the 1350 kit because I didn't want to have to cut the fiberglass on this car as you have to do with the 1480 kit that I currently have in my '67 632 car.

Tom recommended the HY-TUFF inner axles and Mike recommended the Billet Flanges.

I went with the following Tom's Differential components:
12V-KIT (12-bolt Corvette Conversion Parts Kit with 4.11 gears)
1350-VAK (1350 Vette Axle Kit with upgrade to HY-TUFF inner axles and Billet Flanges)
C10V-HDRC (H.D. Rear Cover)

Mike supplied his own custom left-side cap. At this point all of the work that Mike has performed is first class. Of course, the real test will be when I take it out to the drag strip.

I have included some pics:






Once I get the motor completed, my plan is to make a few DynoJet runs with the factory 3.70 rearend and then switch to this new 4.11 rearend and make a few more runs to see what the differences are.

Steve

Beach Dude

That is some SERIOUS looking hardware.

632C2

I would agree.

1coolC2

A great upgrade!! Knowing how you like to put crazy HP in your rides, it's a good insurance policy. As always, top notch

R/
Jeff

69ttop502

I, for one, will be very interested in the dyno results. Do you think the 12 bolt will eat more horsepower? I have the 10 bolt upgrade with the 1480 series stuff in my 69, and have always been curious of the power penalty I am paying. Good stuff Steve.

Bill

632C2

Hey Jeff, I agree with you on the insurance policy.

How close are you getting on your new manifold deal? As I have said before, I am anxious to see how that all works out.

Steve

632C2

Based on the weight of everything in the 12 bolt setup, my very un-scientific guess would be yes - the 12 bolt will eat more horsepower. Also, the gear ratio is going from 3.70 to 4.11. I have heard about some people that have tested before and after with gear changes and the steeper gear consumed more power.

Thanks, Bill.

Steve

tracdogg2

It will eat up a little hp due to the higher polar moment of interia. Also from the change in hypoid angle on the gear teeth going from a 3.70 to 4.11. But nothing compared to Ford 9 in which has a very high angle.
Mike

1-2-b-67L89

What the heck, oh yea,
I've heard this is the way to go so congratulations and as already mentioned, that is one serious looking set-up.

vetrod62

It may eat up a few HP, but that is better and cheaper than leaving parts all over the ground.

632C2

Hey, thanks. Tom's and Mike have done an incredible job.

I couldn't have said it better myself.

Steve

427Hotrod

Strong is good!

You ought to see the size of my Dana 60 inside sometime with a 9.75" ring gear! AND 3.5"x.134 wall halfshafts and 1480's! Heavy stuff..but I haven't touched it since I put it in many years ago!

632C2

Jim, the abuse you have put yours through over the years is a true testimony. It might be the strongest IRS out there!

Steve

Stingxray

632C2:

I felt the same way ...I didnt want to chance failure's on the SWC 's Six link Suspension . Tom 12 bolt conversion should do the trick for this application also. I decided to go back to 3:73 from 4:11's for the overall drivability with TKO600. Not as beefy as 427's Dana 60..... but this sucker will handle like a rail . And yep ...that's 304 stainless components & Splined-Telascoping Half shafts.










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632C2

Interesting looking setup. I have never seen this before. Either I haven't been paying attention or this is a new concept.

Steve

Stingxray

Steve :
It's an old concept (1970's) Greenwood ... Just our Italian renditions of it. Been working on this............ off and on for a year and a half. I've fabbed two sets of these ....one for another project.

http://forums.corvetteforum.com/c1-a...surrected.html

sub006

Will the driveshaft U-joints now be the weakest link?

4 Speed Dave

Wow you dug this one up from the archives:

Not if you go to a larger driveshaft and 1350 joints. Here read this.http://forums.corvetteforum.com/c1-a...65-needed.html

Kerr

looks good for sure,

Ive never had a problem with the actual rear end, or gear, its always the bolts or snubber? bushing that results in my broken parts.. How does this kit upgrade that?