Sniper Posted November 6, 2021 Report Share Posted November 6, 2021 6 minutes ago, Dodgeb4ya said: Axle end play specs grew on the mid to late 50's cars.. .013" to .018" I wonder if that was due to higher speeds available with v8's? Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted November 6, 2021 Report Share Posted November 6, 2021 1 minute ago, Sniper said: I wonder if that was due to higher speeds available with v8's? I think that is the answer. Quote Link to comment Share on other sites More sharing options...
James_Douglas Posted November 8, 2021 Report Share Posted November 8, 2021 It did not have anything to do with V8's. The tech note, the best I remember, said that due to the New Interstate Highway System that sustained higher vehicle speeds were causing the heat in the axles and they elongated. This caused them to bind on the stop or rubbing block in the differential. Therefore they added more end play. It is function of sustained speeds not engine type or size. I know we all run out flathead six's down the freeway at 65 and 70 all the time and that would have been very unlikely in the late 1940's. James Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted November 8, 2021 Report Share Posted November 8, 2021 The modern V8's certainly had an effect...caused higher attainable and longer constant high freeway speeds. The old obsolete wimpy flatheads didn't have enough power to heat up those rear ends causing elongated axle shafts ha ha that needed up to an additional .010" clearance. Quote Link to comment Share on other sites More sharing options...
James_Douglas Posted November 9, 2021 Report Share Posted November 9, 2021 On 11/7/2021 at 11:46 PM, Dodgeb4ya said: The modern V8's certainly had an effect...caused higher attainable and longer constant high freeway speeds. The old obsolete wimpy flatheads didn't have enough power to heat up those rear ends causing elongated axle shafts ha ha that needed up to an additional .010" clearance. I disagree. It is not the engine HP it is the speed down the road for a sustained time. Case in point is my bad ring and pinion gear in the '47 Desoto. I can run it for short amounts of time here in San Francisco and it is fine. After about 10 minutes running down the freeway it heats up and starts to howl. It is function of the cars speed. I run my flathead for hours at 65 on the freeway. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted November 9, 2021 Report Share Posted November 9, 2021 I found that I just need a nice straight road to get to 88 MPH....the rest is either future or history.....!!! Quote Link to comment Share on other sites More sharing options...
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