I have a 1962 chevy impala 2door sport coupe, originally came with a 327 engine, but has a 350 in it when I bought it, last owner told me it's the original factory 4 speed tranny. But wanna find if it's original tranny still in car.. Vin number to car is, 21847b177095... I looked under the car, n saw a few numbers on tranny first numbets n letters I saw were t10-k then had letters wg.div n also had on the side a letter b with a circle around it....now the secon part of letters n numbers behind those read, wg div r-2 and t10 7d.... Then behind those letters n numbers was a small plate with numbers, 1 19 62. Can anybody help with my question?? N is it a saginaw or muncie or other kind of transmission?? Any help would b nice, thnkz