jason93 -
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Sounds like a 37 to me. The 37 code is GC on the ID plate on the right hand side of the cab just under the hood and facing outward toward you as you look at it. It should be screwed on to the cowl with two metal clutch head screws. You will have to tilt your head to the left to read it. The 36 code is FC and the 38 code is HC.
That gap between the front fenders and the cab is supposed to be there - I don't know why, but it is.
The way to fill it is to have an upholstery shop make up a vinyl covered piece of windlace the appropriate length and leave a tail on it so it looks like a larger version of fender welt, commomly used on these trucks, and fasten it into place using the holes in the fender flange, to fill the gap. If you will send me your email address, I can send you a picture of what it should look like.
There were some differences between the 36 low cab and the 37 cab. The 36 had wood under the dash as partial bracing - the 37 didn't. The 36 had straps to stop the door from opening too far, the 37 had door checks within the doors. The 36 gas tank was under the rear of the bed, the 37 was under the seat. There are a few more more subtle differences, but those are enough differences for you to tell. The 36 had a wooden floor board, the 37 was metal and it was different depending on whether you have a four speed transmission or a three speed transmission. A fiberblass replacement is made for the four speed and can be used for the three speed with an addition small piece of sheet metal that you will have to make or have made to surround the smaller gear shift of the three speed.
37's are great trucks. It was the beginning of the modern age. The radiator cap was under the hood for the first time! Bigger things were comming, but the 37 definately turned the corner for Chevrolet.
Joe
