Re: IML: Sure-grip rear end, Gear Ratios & Towing

[dardal@xxxxxxxxxxxxxxx]

As far as I know, the 68 towing package includes a stengthened hinge assembly,
so that the load is evenly distributed on the rear unit body structure, and a
heavy duty transmission cooler that resides where the AC condenser normally
does (that's why there was no AC avialable for a towing package 68 Imperial). 
The ratio remained the same at 2.94 though.  I think the stock small duration
cam 440 will have no problems handling large loads with the stock 2.94 ratio
and that huge transmission cooler.

I do not know if in 63 there was an available 3.23 ratio or you had to special
order it.  There is a road test of a 61 though (on the site somewhere) from Car
Life with a 3.23 (which shows good acceleration improvement, as expected).

D^2

Quoting FltSgt@xxxxxxx:

> And a Happy New Year To All
> 
> A side subject that is related to this is "Towing with our Imperials".
> 
> I have a '63 Le Baron with the Sure-Grip and the ratio is 3:23 to one ( 
> un-altered OEM ).  I have found out that pulling a '66 Le Baron east-bound
> with the 
> '63 on I - 80 up the grade from Calif to Reno can be done.  The same trip 
> encludes E-B I - 80 out of Salt Lake City with its grade heading back to
> Colo.
> 
> The 1967 Chrysler Towing Brochure states, " Remember a Chrysler, any 
> Chrysler, will tow loads up to 2500 pounds without the addition of a single
> extra-cost 
> item-except the hitch and proper turn signal flasher, of course. "  
> 
> Later in the brochure it states, " For towing heavier loads get this special
> 
> trailer-towing package. (It cost just $53.55.)  And you get a package of 
> heavy-duty components for towing loads up to 5500 pounds. "
> 
> The center portion of the brochure shows an Air Stream being towed up a grade
> 
> with a family of four in the car.  Two of the items they speak of for the tow
> 
> vehicle is A/C and Auto-Pilot.  The rear axle ratio for the $53.55 package is
> 
> 3:23 to one.   Looking at what is included for the $53.55 towing pkg and how
> 
> Imperials are equipped over the STD Chrysler, it seems that it is the ratio
> of 
> the rear axle that will make your 1967 and newer Imperial from a 2500 pound 
> rated tow vehicle ( 2:93 to one ) to the 5500 pound rated tow vehicle ( 3:23
> to 
> one ).  The STD ratio for the New Yorkers was 2:76 to one.
> 
> And while on the related subject, the 1955 Air Stream Company advertisement 
> of the twin axle Overlander shows a '55 Chrysler two door pulling it.  In
> 1965 
> they did a performance test using a 383 powered Dodge Polara ( 2:76 to one )
> 
> pulling a twin axle AS Overlander at speeds of over 90 mph and the back cover
> 
> of the 1978 Dodge Truck brochure shows a D150 pulling the Overlander.
> 
> I hope I covered enough of the Imperial content to keep the " OT " police 
> away from me.
> 
>                                        Rodger & Gabby
>                                        Colo Spgs
> 
> '47 De Soto Custom w/Fluid Drive & passenger door mounted swamp cooler
> '63 Le Baron w/F-Sweep trunk lid & std A/C
> '66 Le Baron w/dual A/C & reverbed AM/FM
> '70 Overlander - InterNational
> '77 D150 w/360 & dual intake, NP 4 Spd, 12 Bolt Axle, OEM Buckets & etc
> 
> 
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