Am I reading the Shop Manual right, or am I missing something? It says that the standard rear end ratio for the Sky Hawk with an overdrive transmission is 3.92 to 1. Is this right?...
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Sky Hawk Rear End Ratio?
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Sounds like a good ratio if you have an overdrive. 3.92 would give you lots of pep off the line, and the BW overdrive, dropping your final drive ratio 70%, would effectively drop it to 2.74 when you kick the OD in - a great highway ratio, right?
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Looking at Shop and Parts manuals, the 3.92 was standard in Sky Hawks, with 3.54 and 4.09 as optional. I have driven a couple of 56Js with the 3.92 and OD, and they seemed geared too low (high, numerically). At 2500 RPM in OD, the 3.92 runs around 70 MPH, but that is with a T85 tranny. With a Sky Hawk's T86, it probably would be around 71 MPH, due to the .7 OD ratio, versus the .72 in the T85. For those who like to play with numbers.
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Originally posted by 64studeavanti View Postmy 64 Avanti R1 4spd has 3.54. It is very drivable on the street and seems to have plenty of snap.StudeRich
Second Generation Stude Driver,
Proud '54 Starliner Owner
SDC Member Since 1967
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Originally posted by StudeRich View PostThat is a good Medium Performance Ratio but, it does not apply to an Overdrive Car like Tony's in the least.
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