M100 Leaf Spring U-Bolts

[RonD2]

Kind of an odd-ball question, but can anybody give dimensions of leaf spring U-bolts for the left front M38 or MBT and M416 trailers?? Mine on the M100 are shot and need to be replaced. They measure 2-1/4 wide by 6 inches tall (inside dims), flat top, with 7/16-20NF threads for the long hex nuts. They sit on 10-leaf springs. I believe the whole set-up is original Dunbar-Kapple.

The M100 TM's don't give dimensions for the U-bolts, and neither does the M38 TM's so I can't really tell what's correct or not. The U-bolts on the LF of my M38 seems long to me, about 1-1/2 inches exposed below the nuts. The M100 part number is 7328295. Research leads me to believe they may be the same U-bolt as the left front on the M38 and possibly the same on the MBT and M416 trailers. But each has its own different part number (WO-A575, WO-642987) so I can't tell for certain.

Anyway, I thought I'd ask here for some guidance/advice before I call the suppliers and pester them with questions about various leaf spring U-bolt dimensions so I can get the correct size U-Bolts the 1st time. Nobody shows stock on the M100 part number 7328295. I'd rather not have to get them long and have to cut them shorter if I can help it.

Thanks!
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

[Kendall]

The U-bolts on the front of my M38 are flat-top and measure about 3 1/4 inches from top and 3 1/4 wide with about 1/4 inch of threads exposed.
The U-bolts on my M100 are round-top and measure about 3 1/2 from the top and about 3 1/4 wide and also have about 1/4 inch of threads exposed.
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1951 M38
1952 M38
1952 M38A1
1942 Dodge WC-55
1951 M100 trailer
1942 Ben Hur trailer

[RonD2]

Hi Kendall, thanks for the measuring! It looks like your M38 and M100 U-bolts have about the same width (about 3-1/4 wide outside dim). With the U-bolt being 7/16, my stubby pencil says that's about 2-3/8 inside diameter. I measured my M100 axle at 2-1/4 diameter, and my M38 axle at 2-5/16.

You prompted me to see if my old wore out M100 U-bolts would slip over my M38 front axle tube and no, not without some serious forcing (didn't do that). Should've tried that sooner. I think I was wrong with my original post to say that I thought maybe the M38 front axle U-bolts were the same as the M100. I no longer believe they are.

Looks like I need a want ad for M100 U-bolts. Never seen any advertised or NOS. Does anybody make them?

Thanks again!
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

[wesk]

Firts look up the parts number for the U bolt. If you go to the TM 9-2330-201-14 (M100 IPL) and round up the ORD part # 7328295 and the FSN 5306-732-8295 and google the ORD # the first hit is:
https://aerobasegroup.com/part-number/7328295_00-732-8295

[RonD2]

Thanks Wes! Awesome!

It never occurred to me that the part number is also the last 7 digits of the FSN. And then I looked up the part number 7328295 and forgot to pay attention that G747-7328295 is the complete part number, and G747 should've told me these U-bolts are unique to the M100 only or they might have had a G503, G529, or even a G740 prefix and part number. I'm learning.

I'll make some phone calls to see if I can get some made up.
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

[wesk]

[RonD2]

Found an outfit in Ohio that makes custom U-bolts and has 2-1/4 x 6 threaded 7/16-20NF in stock. They come with the extra thick washers and long nuts. Ordered 2 pair, price was reasonable. Will report when I get them.
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

[RonD2]

DSUBAN.com! $9.88 each, delivered. Ordered Wednesday 2/22 and they were in my mailbox on Friday 2/24. Although the website allowed ordering 6-inch length, the way they make them came out at 7-inch, so I'll have to trim them an inch. The 2-1/4 inch width is right on.
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari