Lowering blocks from Autozone

Crs · Apr 30, 2005

Has anybody bought lowering blocks from Autozone? Any problems? If so, which vendors do you recommend? I need to drop my 68 2" in the back.

10secgoal · Apr 30, 2005

Complete junk. Unless they carry the steel ones now. The aluminum ones constantly split.

12sec67 · Apr 30, 2005

i've split autozone's a few times! try an off road warehouse for lifting trucks, they usually make them out of cast steel which are fairly heavy but then again they haven't shattered yet!

also i've learned that when lowering the car that much you might also need to get a 2 degree shim kit from summit racing due to the pinion angle being to extreme. if you don't you have a bad vibration!

ask how i found that out!

zookeeper · Apr 30, 2005

10secgoal said:
Complete junk. Unless they carry the steel ones now. The aluminum ones constantly split.

That's news to me. I've been using them to drop cars and trucks for longer than I care to remember (20+ years) without one single failure ever. I have not babied these cars, either. They have been bracket raced, street raced, towed trailers and been used hard. Not only that, but aside from this post and Historic's posts, I've never even heard of a failure. Anyone got a picture of a block split from use?

12sec67 · Apr 30, 2005

10secgoal said:
Complete junk. Unless they carry the steel ones now. The aluminum ones constantly split.

this is based off my mustang, my cousins mustang, friends mustangs experiences

geostang351 · Apr 30, 2005

Wouldn't actually lowering the body of the car decrease the amount of pinion angle? The rear stay stays the same, but the body to which the tran. is attached to is lowered. What do you think?

zookeeper · Apr 30, 2005

I'd sure like to know the circumstances under which these things broke. My brother had a '67 Cougar that ran mid-12's with a manual trans and he couldn't break them, and that's saying something! Ever hear of someone able to break a ball bearing in a sandbox? That's him. Again, I've used them with no trouble at all, sure would like to know what you guys are doing to them.

12sec67 · Apr 30, 2005

geostang351 said:
Wouldn't actually lowering the body of the car decrease the amount of pinion angle? The rear stay stays the same, but the body to which the tran. is attached to is lowered. What do you think?

all i know is that the shim kit work and the vibration is gone!

without the shim- when i let off the gas the pinion nose would turn down and create a vibration. with the shim, the nose doesn't come down as much and there is no vibration

12sec67 · Apr 30, 2005

zookeeper said:
I'd sure like to know the circumstances under which these things broke. My brother had a '67 Cougar that ran mid-12's with a manual trans and he couldn't break them, and that's saying something! Ever hear of someone able to break a ball bearing in a sandbox? That's him. Again, I've used them with no trouble at all, sure would like to know what you guys are doing to them.

where they cast aluminum or cast steel?

i run mid 12's with an AOD and i break them, and my cousins mustang runs mid 13's with a 4spd and he can break them, and that's also saying something!

it happens, not to everyone i guess - but if you plan on getting them i would look for the cast steels as i stated earlier or your always going to be wondering if todays the day your going to shatter your blocks.

i shattered mine shifting at WOT at 6400RPMS from 1st to 2nd shift and when that happened it twisted the rearend up into my floor boards then split my solid driveshaft and messed up my tranny. expensive mistake when all i had to do is get cast steel blocks instead of the aluminum.

its up to you

ozstang65 · May 1, 2005

Crs said:
...I need to drop my 68 2" in the back.

Do it properly and get a set of reverse eye springs.

HistoricMustang · May 1, 2005

zookeeper said:
That's news to me. I've been using them to drop cars and trucks for longer than I care to remember (20+ years) without one single failure ever. I have not babied these cars, either. They have been bracket raced, street raced, towed trailers and been used hard. Not only that, but aside from this post and Historic's posts, I've never even heard of a failure. Anyone got a picture of a block split from use?

Have also seen the aluminum crack under heavy duty. It just seems the early models retain the "curve" that comes with leaf springs and this creates stress. I had the same problem.

Mine are now "polycarbonate" but that is another story!

HistoricMustang
www.historicmustang.com

Lowering blocks from Autozone

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