Changing from single to double shear

[RickyBobby]

So my single shear rear end kept leaking around the brakets no matter how much weld we put on them.  So I bought a double shear rear end in the car and got it installed.  The measurements I got when I would square the rear end from the frame rail was 12 1/8 inches.  Now that I have installed the new double shear the rear end seems to be farther forward.  My measurements when I went to square was 11 7/8 inches.  Now I cannot get 6 inches of clearence on both sides.  Has anyone else had this?  Are the pick up points on the double shear different?  I am goig to move the rear end back tonight so I can get the 6 inch rule back.

[justfreaky]

RB,

 Pick up points should be the same.
Could be slight differences due to welding process.

Or;

 Could it be that you washed your car in hot water
and it shrunk some? 

 Steve

[RickyBobby]

Lol.  I did wash it but it is a dark colour so I make sure to wash in cold watter

[LunaticMark]

cold water... good choice, that way the color doesn't run... lmao!!! Check your measurements on your rear end housing... it may have been a manufacturing flaw. If the rear end was in the jig crooked, then the mounts may have been installed off a bit, also check your rear end for straightness... yes, i know it's new, but trust me... SEVERAL of the guys here had bent rears from the factory.

[RickyBobby]

how do you check for it being straight?

[justfreaky]

RB,
 Maybe this will help.

http://www.kevscorner.com/Corner2004/KCLegendSquare.htm

 I'm off work today and will research a bit more for you.


Steve

[RickyBobby]

Thanks Steve,

This is what I had done to ensure it was square.  I was wondering how to check the rear housing to see if it is not bent.

I moved the rear end back last night to 12 1/16 and I got my 6 inches on both sides again (just).  So I am legal for this week :-).  I do not like how the heims are showing lots of thread though.  I had it at 12 1/16 before on the single shear with no threads showing.

[justfreaky]

Try this link. At the end of the article on How To Manufacture A Rear End there is a simple angle Iron check tool.


http://www.dwarfcarracing.com/tech_info_.htm


Steve

[elimn8u_43]

Try this http://www.cmgmotorsports.com/housings.htm

Geoff

[RickyBobby]

So I also found out that I was taking my 6 inch meaurement in the wrong spot.  I was measuring to the backing plate when I should have been meauring to the drum.  That make a hug difference.

[DARK AGE 53]

So I also found out that I was taking my 6 inch meaurement in the wrong spot.  I was measuring to the backing plate when I should have been meauring to the drum.  That make a hug difference.

You want to measure from the backing plate not the drum.

Later,
Al

[gramps05]

2008 rule book, page 59, para 77 measurement taken from the inside edge of the Brake Drum.....

[DARK AGE 53]

2008 rule book, page 59, para 77 measurement taken from the inside edge of the Brake Drum.....

I stand corrected, I know I read it some where but obviously it wasn't the rule book. ...now to recheck my son's car...thanks for the correction.