Weakest link in '81 rear?

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Feb 23, 2011 | 11:59 PM

#21

Clint's C3

Burning Brakes

Joined: Jun 2004

Posts: 1,012

Likes: 5

From: Granbury, TX

Quote:

Originally Posted by damoroso

Nice launch Clint!! What are you running for power in that?? BTW, I'm sure having Mike do your rear was less expensive than the iron conversion. Off the top of my head, I'd guess mine was around $1100 including the rebuilt diff.

Thanks.

my mods are:
4 bolt 383, forged pistons and crank, H-beam rods, 10.8/1 CR, Stan's headers, 1985 FP, Holley 750 DP carb, Edelbrock 60759 heads, 22015 cam, 7501 manifold, MSD Ign. 3500 stall, 3.73 gears, beefed T700-R4.

I figure I'm putting about about 450 HP. Not too bad for a street legal machine.

Feb 24, 2011 | 06:57 AM

#22

Stu's81

Racer

Joined: Nov 2009

Posts: 285

Likes: 9

From: Waukesha Wi

Quote:

Originally Posted by stinger12

There is only one person I would trust machining and installing a steel cap in an aluminum diff, and he is right here on the forum. He's been doing it for a while now, and he has all the jigs set up. Check out this monster...

If you wanna keep your diff together, I would go this route. Just some advice.

So who is this person making these caps and what kind of $$$ are we talking? I need to do a gear change and rebuild this spring/summer and would like to up grade everything before putting it together.

Feb 24, 2011 | 08:27 AM

#23

nate99

Race Director

Joined: Mar 2008

Posts: 15,161

Likes: 17

From: coffee

Quote:

Originally Posted by tracdogg2

Yes,
I'm in Garland.
Mike

Quote:

Originally Posted by Stu's81

Mike is tracdogg2, or so I gathered from the posts.

Feb 24, 2011 | 08:42 AM

#24

damoroso

Burning Brakes

Joined: May 2008

Posts: 1,116

Likes: 5

From: Middleburg Florida

Quote:

Originally Posted by Clint's C3

Thanks.

3500 stall, that explains it!!

I'm running a warmed up big block in my 81, but I'm running a much tighter converter so I don't get a launch anything like that!!

Feb 24, 2011 | 11:06 AM

#25

hugie82

Safety Car

Joined: Mar 2007

Posts: 3,652

Likes: 49

From: Bridgewater nj

Quote:

Originally Posted by damoroso

3500 stall, that explains it!!

I'm running a warmed up big block in my 81, but I'm running a much tighter converter so I don't get a launch anything like that!!

If you got a Big Block up front your gonna need alot more than a converter to lift that hunk of iron up

Feb 24, 2011 | 11:31 AM

#26

TheSkunkWorks

Le Mans Master

Joined: Apr 2007

Posts: 7,353

Likes: 72

From: Graceland in a Not Correctly Restored Stingray

Quote:

Originally Posted by hugie82

If you got a Big Block up front your gonna need alot more than a converter to lift that hunk of iron up

Why does this propaganda persist?

They aren't as heavy as you might believe; an alum head, intake and water pump BB weighing in at less than 100# over an L82.

Feb 24, 2011 | 11:43 AM

#27

Rebelrob

Drifting

Joined: Jul 2009

Posts: 1,534

Likes: 14

From: Dallas-Fort Worth TX

Quote:

Originally Posted by TheSkunkWorks

Why does this propaganda persist?

They aren't as heavy as you might believe; an alum head, intake and water pump BB weighing in at less than 100# over an L82.

Yep, and do not forget an Aluminum radiator as well. I think that is good for a few pounds less than the stock copper. I have all the above you mentioned, I do not think its much heavier than my old L83.

Stu, contact tracdogg2 , he will provide you information on the steel cap for the alum rear end.