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I think this discussion may be the result of (1) the definitions of NDCC and NDT tread designs, and (2) how tires were marked by the manufacturer.I've had so many M37s and M35s I'm trying to recall ever seeing an NDCC on an M37. I have a few 9.00-16s right now and they're NDT. On the M35s I'm trying to remember ever seeing anything but NDCCs on them. I have to go with the NDTs being the correct M37 tire, even up through the B1 series into the late 60s.
The square shouldered design is considered the NDT. There is a rediculous notion out there that there were no NDT's produced after WWII. This is a gross error started by STA (Specialty Tire of America) and can still be found on some of there websites. All of the many many M37's I have personally looked at and have owned used NDT's only. This is not based on two trailers I own, but since trailers are being used as an example the several dozen M101's and other 3/4 ton types I have owned have all had NDT style tires. Although lately I have found M101's being released with civilian non directional tread tires on them. These are the only 9.00-16 tires that could be found by the government apparently. I believe these are civilian 9.00-16 tires made by STA but can't specifically remember the name. I had a trailer with two of them mounted but have sold it over the last year. I have about a dozen 9.00-16's on the property right now. All of them are NDT. The two tires I have pictured are Goodyear and Denman. The Goodyears are old enough, early 60's that they still have a date stamp. The Denman is new enough that they use the new coded date stamp. If there are "rounded" shoulder 9.00-16 tires that someone has I'll bet they're rounded because of wear. The manual referenced above through Olive Drab is a generic description of the non directional military tread and also mentions other non directional patterns. The simple line drawing is for a generic visual reference. Start paying attention to all the pictures of M37's you see with standard military tires and you'll find them mounting the squared shouldered design which we call NDT, but most of the time the style name was never molded onto the tires. A picture which shows a "NDCC" style 9.00-16 tire that wasn't clearly worn round would be of some interest.I think this discussion may be the result of (1) the definitions of NDCC and NDT tread designs, and (2) how tires were marked by the manufacturer.
The current version (dated Sept 2000) of TM 9-2610-20-14 does not reference the square shouldered NDT design. It does reference the NDCC design. I have seen the 1977 version of this TM and it does reference both the NDT and rounded profile NDCC. The older TM 9-2610-20-14 refered to these as "tactical" tires and as "mud and snow tires".
The Sept 2000 version is at:
http://www.olive-drab.com/archive/od_tm9_2610_200_14_tires.pdf
The NDCC design is discussed in Chapter 1, Sect II, Para 1-8, Page 1-10.
Do we all agree that the rounded tread shoulder profile is the NDCC?
I suspect the primary source of confusion is how the various manufacturers marked their tires at various times. It does not appear to me that markings were standardized.
I have five 9.00 - 16 tires which came on trailers acquired via DRMO. They are marked as follows:
Pioneer tool trailer:
(a) U.S. RUBBER, MASTER GRIP, U.D., MILITARY, dated 9-64
(b) same as above
M101 trailer:
(a) GOODYEAR, ALL SERVICE, MILITARY, S OZ, dated 6-68
(b) DENMAN, MUD-SNOW, NON DIRECTIONAL, MILITARY, cannot find a date
(c) cannot get to the spare tire at the moment
1. All four of these tires clearly have the rounded NDCC profile.
2. None of the tires are marked NDCC.
3. One of the tires is labeled NON DIRECTIONAL (but without reference to TREAD, NDT, CC, NDCC, or CROSS COUNTRY.)
4. The U.S. Rubber tire is marked "U.D." but I do not know what this means.
I also have an M416 trailer with 7.00 -16's. One Firestone and one Goodyear. Both tires dated in the mid 60's. The Firestone is marked ND-CC, the Goodyear is marked ALL SERVICE, N.D.C.C.
My conclusion is that the DoD did not tightly specify how these tires were to be marked regarding the tread pattern.
The only place I've ever seen a square shouldered NDT tire is on fully restored WW2 era vehicle at MVPA shows.
Regards
Jim
Did you buy the trucks direct from the DRMO?both my m37's had ndt's on them so thats all i know. lets think about this also if they did fase out the ndt that dosent mean they took all the ndt's they had to the dump.
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