Source:http://ftr.wot-news.com/2014/06/28/straight-outta-supertest-new-tier-6-us-lt/
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Hello everyone,
大家嚎， 

as you know now, the American light tanks (T5: Chaffee, T6: T37, T7: M41, T8: T49) are coming in 9.3 (hopefully, they were postponed like a bazillion times in the past). First models are making it to the supertest. This is the tier 6, T37 light tank. The top turret you see in this case is apparently the elite one (T41, this would later on become the Walker Bulldog).
如你所知，美国轻坦们（5级：霞飞，⑥级：T37，7级：M41，8级：T49）将在9.3实装（当然是在理想状态下，这以前已经被推迟过无数次了）。第一批模型已经加入超测了。这辆是6级的T37轻坦。在这里你看到的顶级炮塔是完全体的那个（T41炮塔，后面会变成华克猛犬） 

T37 was basically an attempt to upgrade the Chaffee to have superior mobility and firepower. To quote Priory_of_Sion:
T37其实就是尝试着把霞飞升级，让它具有更强大的机动以及火力时的产物。引用一下Priory_Of_Sion：

First off I would like to discuss the “missing link” between the M24 and the M41, the T37. Most of you should know a little about the T37 by WoT. It is the source for the M24′s upgraded turret, even though it is too large for the Chaffee’s turret ring(the US did have plans to enlarge the T24/M24 turret ring though which would allow the T37′s turret).
首先我想讨论下在M24和M41之间的“丢失的连接”，也就是T37.大多数人应该通过WOT都对T37有了一点了解。它就是M24的升级炮塔的来源，尽管对于霞飞的炮塔座圈来说还是太大了一些（美国人的确试图要把T24/M24的炮塔座圈搞大一点以便安装T37的炮塔） 

Now to discuss the T37. In Jan. 1945 the Army Ground Forces Equipment Review Board and the War Dept. Equipment Review Board both decided the M24 wasn’t fit. They proposed a 25t vehicle that had superior firepower & mobility compared to the Chaffee. They called it the T37.
现在开始说T37.在1945年一月，陆军地面部队装备审查委员会以及战争部门装备审查委员会双双决定M24已经不行了。他们提议了一种25吨重的，相比霞飞具有更强大的火力以及机动性的坦克。他们管它叫T37。

Development began in 1946 and a pilot was produced in 1949. The T37 was split into 3 “phases”. Phase I was the turret and gun combination we see on the Chaffee in WoT. Phase II was mounted with a deadlier T91 76 mm gun (same gun as on the T71 LT) with a Vickers fire control system and became redesignated the T41 (direct precursor to the M41). Phase III was an autoloading variant which wasn’t built due to the Korean War. Some more advanced features of the T37 such as the rangefinders, the FCS and autoloaders were never fully developed due to the war in Korea. In 1950 orders were given to Cadillac to produce 100 T41E1s which became the famed M41 Walker Bulldog.
开发于1946年开始，在1949年产出了一辆原型车。T37被分成了三个“阶段”。第一阶段是我们在WOT中所看见的霞飞上的炮塔与主炮的结合。第二阶段是要加装一杆更厉害的，使用维克斯火控系统的T91 76mm炮（和T71轻坦上那杆一样），并改重命名为T41（也就是M41的直接前身）。第三阶段是要搞一个弹夹炮的版本，但是由于朝鲜战争的原因未能开发。T37的一些更加先进的功能，类似于测距器，火控系统以及弹夹炮由于朝鲜战争的原因从来没有被完全开发。在1950年，他们向凯迪拉克下达了生产100辆T41E1的订单，日后成为了声名远扬的M41华科猛犬。 

I’ll see if I manage to find more info about it.
我会试着找到更多的信息的。