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37 front shackles?
#1364645 Fri Jun 12 2020 06:17 PM
Joined: Feb 2010
Posts: 335
G
Shop Shark
So I rebuild the front shackles on the 37. I can’t say it really handled bad but I knew the bushings were shot so I didn’t give it much thought. The rear bushings on the front springs were badly worn but the front shackles were completely frozen on boath sides.
Now with all new bushings the truck is Squirrley . Can barely stay in one lane at 55. Every thing is new in the front end.
My son has had a few jeeps and he says it a common upgrade on early jeeps( they also have the shackles on the front of the front springs) to reverse shackles to the rear of the springs for better handling. Any body else have this problem.




These old bolts are in my blood. Hard thing is focusing on just one.

1937 Chevy 1/2 ton panel
1953 GMC 2 ton. future car hauler

Re: 37 front shackles?
goneagain #1364668 Fri Jun 12 2020 09:13 PM
Joined: Feb 2001
Posts: 1,125
D
Shop Shark
Did you put the castor wedges back in ?

Is the toe in measurement correct ?

Stuff may have been previously adjusted to compensate for the worn set up .

Last edited by Dusty; Fri Jun 12 2020 09:14 PM.
Re: 37 front shackles?
Dusty #1364690 Sat Jun 13 2020 12:04 AM
Joined: Feb 2010
Posts: 335
G
Shop Shark
Yes I did put the original caster shim back in. But that doesn’t mean it’s correct. The toe is set at 1/4

Stuff may have been previously adjusted to compensate for the worn set up .[/quote]

Didn’t consider that but makes sense




These old bolts are in my blood. Hard thing is focusing on just one.

1937 Chevy 1/2 ton panel
1953 GMC 2 ton. future car hauler

Re: 37 front shackles?
goneagain #1364715 Sat Jun 13 2020 03:34 AM
Joined: Jun 2011
Posts: 3,597
E
Shop Shark
Toe at 1/4, Is that in or out.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: 37 front shackles?
goneagain #1364718 Sat Jun 13 2020 03:47 AM
Joined: Feb 2010
Posts: 335
G
Shop Shark
Sorry toe is 1/4” in. Using an angle gage on top of king pin casting.caster looks to be 0-1 degree positive.
I am running radials.

Last edited by goneagain; Sat Jun 13 2020 03:54 AM.



These old bolts are in my blood. Hard thing is focusing on just one.

1937 Chevy 1/2 ton panel
1953 GMC 2 ton. future car hauler

Re: 37 front shackles?
goneagain #1364822 Sat Jun 13 2020 11:59 PM
Joined: Mar 2002
Posts: 9,022
Master Gabster
So the question I would ask, has the suspension been lowered? If so you may have bump steer. The steering box should be adjusted too to eliminate any problem there.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: 37 front shackles?
goneagain #1364848 Sun Jun 14 2020 07:57 AM
Joined: Feb 2001
Posts: 1,125
D
Shop Shark
1/4" is excessive - you will experience excessive tyre wear. Also twitchy steering smile


The shop manual here specifies 5/64" - 1/8" toe in.

I normally err on the side of caution and go for the smaller figure . I do this in the (possibly mistaken) view that the radials have less rolling resistance and therefore will push the wheels out less .

My tread wear is consistantly even.

Last edited by Dusty; Sun Jun 14 2020 07:58 AM.
Re: 37 front shackles?
goneagain #1364852 Sun Jun 14 2020 12:16 PM
Joined: Feb 2000
Posts: 4,168
J
Shop Shark
My '37 has 4 degrees caster due to the ride height front and back. It drove OK with 2, but kinda of loose like yours. 4 is much better. The thickest part of the wedge goes towards the rear. Toe-in should be 1/8" when setting in [ as driven position ], meaning all steering joints loaded. If you are using the original style tie-rod and draglink link ends, be sure they are adjusted up tight and the ball end is still round. Did you adjust the steering box? Is it centered? The steering box has a dead center adjustment that keeps the truck going straight without a lot of input from the driver, this will help keep it in its lane.

There is no reason to change the spring mounting, they can drive as good as anything once you get it set right.

Re: 37 front shackles?
goneagain #1364858 Sun Jun 14 2020 01:24 PM
Joined: Feb 2010
Posts: 335
G
Shop Shark
Thank you all for the advice.i don’t know why my brain was stuck on the shackles. Must be an old guy thing..
It’s stance is a little lower in the front and it has power steering. I ordered 6 degree shims thinking I’ll end up with 5 degrees. I’ve read with power steering you can get away with a little more. I’ll change the toe in to a short 1/8” and see what happens.
Another thing I forgot to mention was after rebuilding front springs the steering wheel is off center almost A quarter turn.

Last edited by goneagain; Sun Jun 14 2020 01:37 PM.



These old bolts are in my blood. Hard thing is focusing on just one.

1937 Chevy 1/2 ton panel
1953 GMC 2 ton. future car hauler

Re: 37 front shackles?
goneagain #1364873 Sun Jun 14 2020 03:34 PM
Joined: Feb 2000
Posts: 4,168
J
Shop Shark
That happens when you lower the front, even a little bit. It will change more when you add the extra caster to it. I had threaded rod made with left and right hand threads, then added tie-rod end to it. This went in place of the fixed draglink so I could dial in the steering box dead on straight ahead. You will have to come up with something similar to correct yours. I bet it turns more oneway then the other. It makes a big difference in how they drive, and if your gear box has variable ratio steering it will be worse when not on center.

Once you get the caster shims in, hookup a couple ratchet straps to the axle and bumper and pull the axle forward before tightening the u-bolts, this will insure the axle is fairly straight as there is some slope in the locating holes. As you tilt the axle with either lowering or caster, it moves the steering arm closer to the gear box, this is why the wheel is off center.

The attached drawing from the '37 Engineering manual shows the arc of the axle verse the steering.

Attached Files
'37 truck steering.jpg (59.69 KB, 33 downloads)
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