As follow-up to Owen's comments, is there a externally identifiable characteristic that confirms a Sure-Grip is in there? Is there a difference in the differential housing that quickly identifies these Sure-Grips? John -----Original Message----- From: Owen Grigg <ram300@xxxxxxxxxx> To: 'christopher beilby' <thelastbestgenius@xxxxxxxxxxx>; lettercars@xxxxxxx; chrysler300@xxxxxxxxxxxxxxx Sent: Mon, 3 Dec 2007 4:09 pm Subject: RE: [Chrysler300] Sure Grip Rear - 300C ? Does the diff centre on your car have a stamping on the pad below the filler plug on the passenger side? This is where the ratio is stamped, are there any other letters or numbers on it? Or is there an aluminum tag around the filler plug? Was your car a 399 motor code with the "chassis package"? Owen _____ From: christopher beilby [mailto:thelastbestgenius@xxxxxxxxxxx] Sent: Tuesday, 4 December 2007 9:37 a.m. To: Owen Grigg; lettercars@xxxxxxx; darrin.bailey@xxxxxxxxxxxxxxxx; chrysler300@xxxxxxxxxxxxxxx Subject: RE: [Chrysler300] Sure Grip Rear - 300C ? My Dec 1956 build Daytona "Flying Mile" car/300C has a limited slip diff fitted, however at this stage I do not know if it is factory fitment. After the car ran at Daytona in early Feb 1956, Briggs Cunningham (a la the Cunnigham sports race car Le Mans attempts), took the motor and car to set the supercharger mixtures correctly that limited/wrecked Daytona speeds to just over 150mph, and set them up on his engine dyno, reinstalled it and did whatever mods he felt necessary, whereafter the car ran supposedly undefeated at various eastern states drags for some period. The car has seemingly all other corrrect factory equipment, orig numbers everywhere, however Cunningham would have been savy enough to fit limited centre diff if car did not have it then, even to it still having one of only two known special build superchargers that I believe Cunningham was behind seeing built, one off, uprated to seeming so rare race specs. Whatever, either way, the diff centre would have to have been available either Dec 1956, or mid 1957?! Christopher in Australia where some southern parts just had hottest November since white settlement/arrival in the 1800s _____ To: lettercars@xxxxxxx; Darrin.Bailey@xxxxxxxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx From: ram300@xxxxxxxxxx Date: Mon, 3 Dec 2007 17:48:07 +1300 Subject: RE: [Chrysler300] Sure Grip Rear - 300L Hi all, I believe there was some talk to suggest that Kiekhaefer was using/experimenting with limited slip rear axles in his race '55-6 300's too. Owen -----Original Message----- From: Chrysler300@ <mailto:Chrysler300@xxxxxxxxxxxxxxx> yahoogroups.com [mailto:Chrysler300@ <mailto:Chrysler300@xxxxxxxxxxxxxxx> yahoogroups.com] On Behalf Of lettercars@aol. <mailto:lettercars@xxxxxxx> com Sent: Monday, 3 December 2007 4:34 p.m. To: Darrin.Bailey@ <mailto:Darrin.Bailey@xxxxxxxxxxxxxxxx> scc.virginia.gov; Chrysler300@ <mailto:Chrysler300@xxxxxxxxxxxxxxx> yahoogroups.com Subject: Re: [Chrysler300] Sure Grip Rear - 300L Darrin and All: The 300L was definately available with the Sure Grip limited slip rear axle----all year long. The info I have says it was standard epuipment, but I think I will defer to 300L model year consultant Don Warnaar on that one. Sure Grip was introduced in 1958 and was an option from that year on. 1957 390HP 300C performance package included a "limited slip" differential as well. I don't think I would put too much trust in the accuracy of that book! In a message dated 12/2/2007 9:11:16 PM Eastern Standard Time, Darrin.Bailey@ <mailto:Darrin.Bailey@xxxxxxxxxxxxxxxx> scc.virginia.gov writes: The 300 Group: I have a question about the availability of the sure grip differential for 1965 Chrysler (and prior years). Per the Chrysler 300 Series Pedigree, Power and Performance since 1955 hardback book from Veloce Publishing, it states on p. 119 in the chart of 300-L options that the Sure Grip option code 596 was available March 1, 1965. Does this seem correct? Does this in fact mean Chrysler did not offer this type rear until after mid-production year? I thought Chrysler offered the sure grip for years prior on 300's? Does anyone know when the first was offered? I even thought a 300-L that I previously owned with a 10/20/64 build date had a sure grip rear and my current 300-L, I believe has sure-grip with a build date of 12/28/64? Could this just be a misprint in the book? 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