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Old 10-24-2019, 01:31 AM   #76
randy500
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Re: 1972 Blazer Steering

Straight axle chevys wandering is always due to frame flex or cracks.
The steering box mounting area is frequently cracked and usually not readily visible.
The front crossmember rivets are almost always loose.

Inspection for cracks: 2 person job, one person moves wheel left snd right while another uses strong lighting to inspect the frame inner and outer around the steering box looking for cracks to open up.

Inspection of rivets: 2 person job, one person shakes wheel left and right the other person holds the rivet and then the crossmember and frame, the rivet should not move nor the frame and crossmember. Repair with bolts that fit the holes very tight, rivet replacement procedure is in the chassis manual i think if you want to look it up.

With a stiff frame the wheels transmit their force through the tie rod to the steering box which restrains the wheel from moving which causes the darting around.
A cracked frame and or loose rivets doesn't restrain the wheel and the truck darts around.
These things are never found via alignment.
Front end mechanics dont look for this stuff.

Off road design has a steering box frame reinforcement and a bracket that ties the drivers frame rail to the crossmember which further stiffens up the front frame.

Loose or missing engine crossmember bolts are also frequently found too. The engine crossmember also ties the front frame rails together.
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Old 10-24-2019, 04:48 AM   #77
mcmlxix
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Re: 1972 Blazer Steering

Quote:
Originally Posted by hemi43 View Post
FWIW, the camber can't be adjusted on these 4X4 trucks. The camber is preset when the knuckles were welded to the axle tubes. Sounds like you have a bent front axle. One side being out that much will definitely make your truck wander all over the place.
Keep us posted !
/\ /\ /\ /\
That's not entirely accurate ...

https://youtu.be/tKsyifhXZwY
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Old 10-24-2019, 04:59 AM   #78
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Re: 1972 Blazer Steering

Maybe check the frame to see if its square... cross measure from common points... this is a 71 but most points should be the same...
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Old 10-24-2019, 05:03 AM   #79
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Re: 1972 Blazer Steering

The ball joints and tie rod ends were just replaced prior to my purchase, but I will double check them.
The cracked frame/ loose rivet scenario was the first thing I checked for when I first bought it because of the steering issue. I thought it was just a worn out gear box. I thouroughly examined the frame, etc. before, during and after installing the new one.
Despite it still being solid, I did order the ORD steering box frame bracket that you mentioned. Hopefully it will fit! The big block may be too far forward?
Nice builds and helpful links Randy. The doors are getting gutted this winter.
Thanks Rich, those are the specs I used to measure everything and all was good.
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Old 10-24-2019, 08:37 AM   #80
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Re: 1972 Blazer Steering

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Originally Posted by mcmlxix View Post
/\ /\ /\ /\
That's not entirely accurate ...

https://youtu.be/tKsyifhXZwY
interesting didn't know that, thanks for the you tube
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Old 10-24-2019, 09:13 AM   #81
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Talking Re: 1972 Blazer Steering

I think I'll just show my wife that beautiful axle assembly and she'll make me order one
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Old 10-24-2019, 10:03 AM   #82
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Re: 1972 Blazer Steering

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Originally Posted by mcmlxix View Post
/\ /\ /\ /\
That's not entirely accurate ...

https://youtu.be/tKsyifhXZwY
Not sure where I was not accurate. I somehow don't think the OP's truck has an aftermarket camber adjuster. Even if he did, those adjusters only allow for a little bit of adjustment. They are not designed to repair bent axles.
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Old 10-24-2019, 05:40 PM   #83
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Re: 1972 Blazer Steering

Great info from everyone, thank you. I believe my issue may be beyond what the gadget on the YouTube video can correct, but I'm glad to know it's out there for potential future use.
I just double checked the ball joints and everything is tight.
I think I just scored a professional shop and all they do is axle and drive shafts. Two co-workers have had insane custom work done to their jeeps there with great results. They're currently working on two '72 Scouts and a C10, so they're not only Jeep guys.
It's going to take a couple weeks to get it in, but I'm starting to feel confident that all will be well very soon!
I will report back in a few weeks as soon as I info to share.
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Old 10-24-2019, 07:42 PM   #84
randy500
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Re: 1972 Blazer Steering

Before you take it to the shop (highly paid parts changer) get a friend and check the frame, maybe 2 fiends, i guarantee you have component movement/looseness that needs to be found.
frame, crossmembers, pitman shaft, im sure all of those are loose. Possibly ball joints and or tie rod ends.
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Old 10-30-2019, 05:51 PM   #85
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Re: 1972 Blazer Steering

Bent axle aside they also make shims that go behind the spindles to adjust camber on Dana 44s. Just google "Dana 44 camber shim".
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Old 11-03-2019, 06:58 PM   #86
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Re: 1972 Blazer Steering

I'm going to throw this question on this thread since we are discussing steering related items. I can't find another thread that discusses it.
My frame is solid but I want to prevent future issues by installing a steering/ gear box brace. I ordered one from ORD but it won't fit because my engine is too far forward. Does anyone know of a good bolt on brace that would fit with a big block?
OR! Does anyone make an aftermarket crossmember that also supports the frame better?
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Old 11-03-2019, 07:19 PM   #87
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Re: 1972 Blazer Steering

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Originally Posted by BIG BLOCK JIMMY View Post
I'm going to throw this question on this thread since we are discussing steering related items. I can't find another thread that discusses it.
My frame is solid but I want to prevent future issues by installing a steering/ gear box brace. I ordered one from ORD but it won't fit because my engine is too far forward. Does anyone know of a good bolt on brace that would fit with a big block?
OR! Does anyone make an aftermarket crossmember that also supports the frame better?
I'd take your question back to ORD and see what they say.
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Old 11-04-2019, 01:11 AM   #88
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Re: 1972 Blazer Steering

What is causing the engine to be too far forward? I have a 4l80e in mine and I was able to install their kit. Itís close but not too close.

Quote:
Originally Posted by BIG BLOCK JIMMY View Post
I'm going to throw this question on this thread since we are discussing steering related items. I can't find another thread that discusses it.
My frame is solid but I want to prevent future issues by installing a steering/ gear box brace. I ordered one from ORD but it won't fit because my engine is too far forward. Does anyone know of a good bolt on brace that would fit with a big block?
OR! Does anyone make an aftermarket crossmember that also supports the frame better?
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Old 11-04-2019, 10:52 AM   #89
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Re: 1972 Blazer Steering

Quote:
Originally Posted by BIG BLOCK JIMMY View Post
I'm going to throw this question on this thread since we are discussing steering related items. I can't find another thread that discusses it.
My frame is solid but I want to prevent future issues by installing a steering/ gear box brace. I ordered one from ORD but it won't fit because my engine is too far forward. Does anyone know of a good bolt on brace that would fit with a big block?
OR! Does anyone make an aftermarket crossmember that also supports the frame better?
This may not be helpful info but K5's have a factory brace for steering box at the frame ( http://67-72chevytrucks.com/vboard/s...61&postcount=1 )
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Old 11-04-2019, 11:36 AM   #90
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Re: 1972 Blazer Steering

This is why mine won't fit: (From ORD: '72 and older with big block motor in the factory big block position may have interference between the crank pulley and box brace, you need approximately 3" from the crossmember to the pulley for the brace to fit.)
I emailed them, DIY4X and some others inquiring about a custom built beefy, front cross member.
The attached pic is not my truck, but mine does have the factory gear box reinforcement as shown.
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Old 11-05-2019, 02:40 AM   #91
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Re: 1972 Blazer Steering

Mine has the same reinforcement. I didnít use their part that goes in that spot. I have my LS3 pretty far forward and donít have interference. I bet it would fit.

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Originally Posted by BIG BLOCK JIMMY View Post
This is why mine won't fit: (From ORD: '72 and older with big block motor in the factory big block position may have interference between the crank pulley and box brace, you need approximately 3" from the crossmember to the pulley for the brace to fit.)
I emailed them, DIY4X and some others inquiring about a custom built beefy, front cross member.
The attached pic is not my truck, but mine does have the factory gear box reinforcement as shown.
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