RE: {Chrysler 300} Transmission Oil Change 300F

["Rich Barber" <c300@xxxxxxx>]

My vintage transmission guy took my '55 tranny pan to his steel workbench, put a block of wood under the edge and hammered each bolt hole from the inside out with the round end of a LARGE ball-peen hammer--to make a miniature Belleville spring/dome outward.  This enabled each bolt to put more  pressure on the flat areas between the bolt holes. I liked the idea and it stopped ongoing leaks.  This modification did require subsequent bolt tightening once.  Checking for flatness of the pan edges probably makes sense-followed by careful straightening/alignment, of course.  Even a little hump between the bolt holes might help.

It looks like there have been several good recommendations for gaskets and sealant.  I did have a Jeep transfer case go out when excess silicone sealant accumulated on a screen over the intake to a little lube pump.

Rich B. in Brentwood.

-----Original Message-----
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of Kevin Westbrook
Sent: Friday, September 24, 2021 7:11 AM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: {Chrysler 300} Transmission Oil Change 300F

I am preparing for a transmission oil change.
Is it best to use a pan gasket or silicone sealer? 
I’m also going to change the speedometer cable and would like to locate the best source.  I’m seeing different lengths listed.  Any tips on this?

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