Rich, thanks for your response! In an earlier post Rolf referred to using
4.11's and 3.89's in his Vixen. Were these widely available and are they a
good setup for autocross (or slaloming as we call it here in North America?)
The reason I ask is I put an overdrive in my 1972 TR6 drive train 2500 S2,
and when I finish warming up the engine I want to slalom the car. From what
you say I guess I have the stock 3.45 gears, and I probably want to go to
something which gives me better accelation coming out of corners. Any
suggestions?
Stephen
> ----------
> From: Rikrock@aol.com[SMTP:Rikrock@aol.com]
> Reply To: Rikrock@aol.com
> Sent: Wednesday, September 29, 1999 6:13 PM
> To: Hill, Stephen M AETT:EX; tvr@autox.team.net
> Subject: Re: Ring and Pinion Source
>
> In a message dated 99-09-29 15:28:43 EDT, Stephen.Hill@gems7.gov.bc.ca
> writes:
>
> <<
> Nick, for those of us who are a little out of the loop on this, can you
> please provide a little background. What ratio would my 1972 TVR (TR6
> drive
> train) have in it? Why are the 4.55 so desireable? And what would they
> have come in? Thanks a bunch. >>
>
>
> Stephen and all,
>
> I'll help Nick out here...he's probably quite busy putting the "Duke of
> Oil"
> together. That's what he calls his TR4A vintage racer.
>
> TVR's with the TR6 drivetrain were fitted with 3.45 diff gears, unlike the
>
> TR6, which was normally fitted for export with 3.73 gears. I'm not sure
> why
> TVR chose the taller gears, but it may have been to get a higher top
> speed.
> Or maybe they got a better price on them from Triumph!
>
> The 4.55 gears were available through the Triumph Competition Dept. When
> used with an overdrive tranny, they are the hot setup for racing on most
> tracks. Hillclimb and autocross cars work well with these gears, or the
> 4.88's, which Triumph also offered. For street use, don't even think
> about
> the 4.88's (but let me know if you have a set). The 4.55's COULD be used
> on
> a street machine, I suppose, but ONLY with an overdrive tranny, and you
> would
> be in a tough situation if that overdrive ever stopped working!
>
> A nice swap for your TVR would be to fit a TR6 3.73 diff. Better low end
> response without giving too much top end away.
>
> Regards,
>
> Rich Rock
> Pottstown, PA
> TR's and TVR's
>
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