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61 Lark

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  • drnittler
    replied
    Thanks one and all. I usually go 50-55. I don't have overdrive so...

    Leave a comment:


  • 63t-cab
    replied
    Yes,as said in post #5 the 3:07 rear gives about a 70 mph range.
    Originally posted by StudeRich View Post
    Your answer not given yet, is 3.73 Standard and Automatic Trans.

    The Engineers must have been thinking Performance with the New Long ram intake OHV Six, and low per gallon Fuel Cost $ etc. definitely NOT MPG, overheating and cracked Heads which we now know should have been the concern going Lower than 3.54 to 1 ratio, even the 3.31 like on V8's, might have been ideal for a Six.
    IMO, the bottom line is the Original 3.73 does not work with this Engine, without Overdrive.
    To make the Engine live you can't keep up with Interstate Highway traffic at 65-70 or more unless you change to 3.31 or 3.07 Gears. You can "Putt" at 45-50 on some roads, but on Interstates today you could Die or cause others to, doing that.

    Leave a comment:


  • 63t-cab
    replied
    The answer was given very quickly in post #2.
    Originally posted by StudeRich View Post
    Your answer not given yet, is 3.73 Standard and Automatic Trans.

    The Engineers must have been thinking Performance with the New Long ram intake OHV Six, and low per gallon Fuel Cost $ etc. definitely NOT MPG, overheating and cracked Heads which we now know should have been the concern going Lower than 3.54 to 1 ratio, even the 3.31 like on V8's, might have been ideal for a Six.
    IMO, the bottom line is the Original 3.73 does not work with this Engine, without Overdrive.
    To make the Engine live you can't keep up with Interstate Highway traffic at 65-70 or more unless you change to 3.31 or 3.07 Gears. You can "Putt" at 45-50 on some roads, but on Interstates today you could Die or cause others to, doing that.

    Leave a comment:


  • StudeRich
    replied
    Originally posted by drnittler View Post
    For the 61 Lark six cylinder, Flightomatic transmission, what was the factory installed rear end ratio? What is the recommended top speed with this set up?
    Thanks.
    Your answer not given yet, is 3.73 Standard and Automatic Trans.

    The Engineers must have been thinking Performance with the New Long ram intake OHV Six, and low per gallon Fuel Cost $ etc. definitely NOT MPG, overheating and cracked Heads which we now know should have been the concern going Lower than 3.54 to 1 ratio, even the 3.31 like on V8's, might have been ideal for a Six.
    IMO, the bottom line is the Original 3.73 does not work with this Engine, without Overdrive.
    To make the Engine live you can't keep up with Interstate Highway traffic at 65-70 or more unless you change to 3.31 or 3.07 Gears. You can "Putt" at 45-50 on some roads, but on Interstates today you could Die or cause others to, doing that.
    Last edited by StudeRich; 05-28-2015, 02:44 PM.

    Leave a comment:


  • 63t-cab
    replied
    Not saying this is Your solution . We once had a 62 Lark Regal 4 dr. with auto and a 3:73,swapped in a 3:07 TT and it could roll down the Highways at about 70 give or take "now the sizable hills were more of a challenge " all around it was a good choice then and put some miles on it year round.
    Originally posted by drnittler View Post
    For the 61 Lark six cylinder, Flightomatic transmission, what was the factory installed rear end ratio? What is the recommended top speed with this set up?
    Thanks.

    Leave a comment:


  • TWChamp
    replied
    I have 63 Lark VI two door sedan 3 speed without overdrive and the engine sounds plenty wound out even doing 50 MPH. I haven't driven it in years just because of the low gearing.

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  • StudeRich
    replied
    I have a '63 Lark VI Regal 2 Door Sedan with the 3.73 and Overdrive, I can do 65-70 without overheating, but before we installed the Overdrive or in direct gear I would not push it over 60, you could already start to see the Temp. Gauge climbing.

    The Temp. stays very stable at the Normal 1/2 on the gauge when not run too fast in Overdrive.

    Leave a comment:


  • jackb
    replied
    3.73 60-65 mph (maybe a bit more-but you have a weak head)

    Leave a comment:


  • drnittler
    started a topic Rear Axle: 61 Lark

    61 Lark

    For the 61 Lark six cylinder, Flightomatic transmission, what was the factory installed rear end ratio? What is the recommended top speed with this set up?
    Thanks.
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