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1951 Chevy 6400
#1315622 Tue Jun 25 2019 05:23 AM
Joined: Jun 2019
Posts: 11
New Guy

I recently bought a 51 6400. Got it running, but there are a few things I need to make her road worthy for around town. Main ones being front passenger side leaf spring shackle assembly. I can find a few different places to buy the smaller shackle, but can't find a 2 ton version. The manual calls for a 2" leaf spring set but I can only find 1 3/4". Is it the same? And is there an easy way to remove the zirc bolt? As you can see from the picture it's sheered off both sides. Not sure how to get it out.

Also rubber brake line hoses. Would like to replace all of them as they look pretty rotted and the passenger side is in two pieces. My guess is the shackle and line are front the same incident. Is there a set available online? They are the original ones and noticed in my digging there are several types of brakes. I'm not there yet. Need to see if she'll stop before I go that far.

Attached Files
received_639940093159721.jpeg (146.52 KB, 100 downloads)
received_330997234496700.jpeg (105.63 KB, 97 downloads)
Re: 1951 Chevy 6400
Waldheri51 #1315623 Tue Jun 25 2019 05:58 AM
Joined: Aug 2018
Posts: 471
Shop Shark
hi Waldheri51
i have a similar problem with my 1 ton front springs, there are 2 inch wide leafs
i think... maybe... that the rear shackle from the 3/4 Ton might be the same part used for the front shackle on the 1 ton and maybe up to your 2 ton
part # 499533

so maybe... check out these parts if they might work for you springs:
classic parts - 74-021 $40 each (washers included)
LMCtruck - 34-1362 $30 each (plus $6 for washer set 34-1406)

i'm also planning to order one set to see if i can make that work on my front 2 inch wide springs
if you find a solution please post it here so we can all know

Re: 1951 Chevy 6400
2ManyTrucks #1315624 Tue Jun 25 2019 06:24 AM
Joined: Jun 2019
Posts: 11
New Guy
My only concern is the zerk bolt being an 1/8" short on either side and how much real estate the metal will have to sit on. I'd hate to have another one with the same issue. Looks like my local auto parts store may have it in stock. I'll take my parts down there tomorrow and see if I can compare them. I'll report back when I get a chance to complete the mission.

Re: 1951 Chevy 6400
Waldheri51 #1315626 Tue Jun 25 2019 10:19 AM
Joined: Jun 2011
Posts: 3,797
Shop Shark
Please be careful with your terminology, Zirk fittings are short, pipe threads(SAE and metric, be careful) on one end and grease nipple on the other end; thread into a shackle bolt and provide lube. A shackle bolt is lubed via a Zirk fitting.

Looks like you need shackle bolts and shackles and appropriate Zirk fittings for your truck.


'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: 1951 Chevy 6400
Waldheri51 #1315634 Tue Jun 25 2019 11:50 AM
Joined: May 2005
Posts: 9,147
You’re searching for front spring shackle kit. The broken off shackle pin will press out with its bushing for replacement. The pins thread into the bushing, but don’t worry about that at disassemble, just remove bushing and all.
I don’t have part numbers handy but these should be very easy to find, I had no trouble at the time on my 1 and also 2 ton.

Speaking about 1948-53.
The front shackle is same as (or similar) for 1 ton through 2 ton. Not same as 1/2 or 3/4 ton because they have narrower springs. Not same as 3/4 ton rear, 3/4 ton through 2 ton do share rear shackles but they don’t fit on the front springs at all.
I say similar because some kits have longer and shorter side plates and some have nuts on the ends of the pins while others use only a carriage bolt to hold the side plates on, all functionality interchangeable though. Perhaps different part numbers for different applications.

Page in the parts manual.Also see previous page for a picture
I think you want 3682788 or 495034 (second is shorter length)
The 1 ton uses 3847460 which has the carriage bolt to hold it together

Last edited by Grigg; Tue Jun 25 2019 07:24 PM. Reason: add part numbers

1951 GMC 250 in the Project Journals []
1948 Chevrolet 6400 [] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup []
---All pictures []---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: 1951 Chevy 6400
Waldheri51 #1315650 Tue Jun 25 2019 03:08 PM
Joined: Nov 2005
Posts: 5,837
3B Offline
Master Gabster
Hy Guys, my Jim Carter catalogue lists their part number for the front 2" shackle as ME493, the spring bolt and bushings for the 2" spring is ME805, I won't quote prices as my catalogue is too old, hope that helps.

Re: 1951 Chevy 6400
Waldheri51 #1315655 Tue Jun 25 2019 04:11 PM
Joined: Oct 2015
Posts: 28
Wrench Fetcher
Brake hoses are available at your local auto parts store. Most likely Raybestos BH4497, or NAPA UP4497. You can measure, but these were used for many years from the mid '30's to 1970. Both front and rear are the same.


1935 QD 1.5 ton stake bed
1937 SD 1.5 ton stake bed
1944 MS 1.5 ton stake bed
1946 PW 2 ton stake bed
Re: 1951 Chevy 6400
Waldheri51 #1315664 Tue Jun 25 2019 06:01 PM
Joined: Aug 2018
Posts: 471
Shop Shark
my mistake, the part number 499533 is only the bushing, and you need the whole shackle

the classicparts and LMCtruck parts i mention above should work,
they use the carriage bolt to hold together and are meant to be a replacement for the part number 3847460 that Griggs suggested

the front shackle for the larger older trucks is 2 inches wide
it is the same shackle for the smaller trucks REAR spring which is also 2 inches wide, we can follow the part numbers and see it's the same one listed in many books for various locations on different trucks.

7.436 shackle, Front Spring
47-52 1 Ton part# 3847460 substitute 3847460 --> 3741083 as of 3-1-58
60-62 D-D (exc. 102 W.B.) Shackle unit 3471083
47-54 COMM., UTIL. (exc. D-D, COE) front (4-1/16 O.L.) 3682788
55-58 COMM., UTILITY (2nd ser.) 4-1/16 O.L 3682788

7.523 Shackle Unit, Rear Spring
55-56 1/2, 3/4 TON (2nd Ser.) (exc. D-D) Shackle Unit 3847460
55-59 1/2, 3/4 TON (2nd ser.) (exc. D-D) (4-1/16 O.O.) 3682788


Last edited by 2ManyTrucks; Tue Jun 25 2019 06:08 PM.
Re: 1951 Chevy 6400
Waldheri51 #1315695 Tue Jun 25 2019 10:42 PM
Joined: Jun 2019
Posts: 11
New Guy
From another person I reached out to Sid at DroppedAxles and found that the 55-59 uses a 2" shackle with nuts on either end of the pins instead of the tapered kind with the one retainer bolt in the middle. Seems like an easy upgrade for a safer ride. Here's a picture with complete shackle and pins.

Attached Files
received_466212720615474.jpeg (438.69 KB, 54 downloads)

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