Lowering rear end
Thread Starter
Melting Slicks
Joined: Sep 2006
Posts: 2,814
Likes: 469
From: Wichita Kansas
Lowering rear end
I added 8 inch spring bolts many years ago but would like to lower the rear another inch. It's sitting at 28.50 now and 'Average' height (from AIM) is 27.00. Wow that's low. Anyway, certainly don't want longer bolts than 8's, so if I take that 'cake' that is on top of the spring and move it below the spring, that will help. Would it be safe? Or should I just remove that chunk and get some shorter bolts to hold the center of the spring? Thanks.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The ratio of bolt length change to rear end movement is about 2:1. If you make the bolt 1/2" longer, it will lower the rear about 1". I would not re-engineer the rear end just to prevent going to a 9" bolt.
Melting Slicks
Joined: Jun 2003
Posts: 2,802
Likes: 241
From: Niles, MI
Thread Starter
Melting Slicks
Joined: Sep 2006
Posts: 2,814
Likes: 469
From: Wichita Kansas
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
Thanks for the photo.
I know what GM writes as specs is one thing but how your car looks. It is just fine in my opinion and I would not mess with it.
'Knowing that your rear is about one inch higher that the front. I would leave it. And from what I can see..GM wants the rear to be lower than the front on teh standard suspension......which is crazy.
Trying to get your car to match these figures that GM wants is...a major waste to time. I check them but I do not get all bent out of shape if they are off. With a 1/2" +/- and a 1/4" form side to side. MIGHT have been good when the car was new ....rolling off the assembly line. But not today when it has been driven and aged.
DUB
I know what GM writes as specs is one thing but how your car looks. It is just fine in my opinion and I would not mess with it.
'Knowing that your rear is about one inch higher that the front. I would leave it. And from what I can see..GM wants the rear to be lower than the front on teh standard suspension......which is crazy.
Trying to get your car to match these figures that GM wants is...a major waste to time. I check them but I do not get all bent out of shape if they are off. With a 1/2" +/- and a 1/4" form side to side. MIGHT have been good when the car was new ....rolling off the assembly line. But not today when it has been driven and aged.
DUB
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Burning Brakes
Joined: Dec 2005
Posts: 1,164
Likes: 224
From: Pawleys Island, SC
Seems like you might have that backward. My experience was going from 6" to 8" bolts got me about 3/4" lower.