I've just swaped my TR3A ratios to 4.3 for use in club sprints and hill
climbs etc. The improvement in driveability and control has been very clear
and I would rank it 3rd after revised suspension and the quaiffe limited
slip dif in terms of performance improvement. It is also OK for highway
driving although our speed limit here is 110Kph which is just over 3,000
revs in OD 4th. The TR Register have a neat xls spreadsheet which allows
comparisons of differenr ratios and wheel diameters which is a must It is
accessible at the following site
http://www.tr-register.com.au/Files/technical.htm
Stephen
59 TR3A
68 TR5
>From: Dave Quirt <quirt@sk.sympatico.ca>
>Reply-To: Dave Quirt <quirt@sk.sympatico.ca>
>To: triumphs@autox.team.net
>Subject: Re: 3.7 or 4.1 Rear End
>Date: Mon, 11 Mar 2002 16:04:52 -0600
>
>Steve:
>
>The 4.1 ratio rear end is rarer than the OD gearbox!! So keep on looking
>for the OD.
>
>My TR3A has the 4.1 with OD and it's great. It apparently came that way
>from the factory (or at least the dealership!!!), but I have put in an
>all-synchro 'box. Years ago I also ran a TR4 with 4.1, although without
>the OD (see above!!). It was definitely not nearly as nice on the
>highway!! Myself, I kinda like the TR4-6 'box + OD and would keep that
>'box rather than do a 5-speed conversion. IMHO of course.
>
>Dave Q.
>
>
> > From Steve Sewell:
> >
> > Which to choose? I had to install my spare rear end in my Daily Driver
>4A. Turns out it is a 4.1 ratio. After more than 60K with the 3.7 the 4.1
>drives a lot different. 2nd gear used to pull hard, now 3rd where most of
>the acceleration is. The 4.1 is whining a little so I am going have new
>bearings and seals put in. Should I rebuild the 3.7 instead? Keep on the
>lookout for the elusive A type overdrive? Maybe even Herman's 5 speed
>conversion?<
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