[Never Enough Power]

A number of years ago I purchased a number of items for 67/68 FB's. One of the items in my build up is a Muncie 4SD, 10 spline. Top Rt. side of case 3885010, Patent # 3088336, L/side EDGE of case 3918TT1 last three letters/numbers could also be 111, or 119. Left side cover plate 3884685. These are only numbers on case. Could any one tell me from the info supplied if trans is a M-20, M-21 . From what I have seen it does not not appear to be an old Rock Crusher.

[Never Enough Power]

A number of years ago I purchased a number of items for 67/68 FB's. One of the items in my build up is a Muncie 4SD, 10 spline. Top Rt. side of case 3885010, Patent # 3088336, L/side EDGE of case 3918TT1 last three letters/numbers could also be 111, or 119. Left side cover plate 3884685. These are only numbers on case. Could any one tell me from the info supplied if trans is a M-20, M-21 . From what I have seen it does not not appear to be an old Rock Crusher.

[68CONV400]

M21 66-67 #3885010

2.20 1.64 1.28 1.00 Gear Ratios
10 Input spline
1 Input groove
1-inch Cluster Pin
27 Output spline


Hope this helps,

Charlie

[Never Enough Power]

Charlie, Thanks for the info on trans. My motor and chilton books did not give me the numbers for the units. A couple of my pontiac books had listings on the type of trans and their ratios but no other information. Thanks again,
Carl