requires 5-speed box, different prop shaft, in theory different diff( which
inpractise you don't need) you can shorten the existing prop shaft if
required. Apart from that there are obvious bits like different lever,
brackets etc. Should bring your revs down to a good level, I remember
reaching 180 at about 5 k revs. Doubt you a) want that speed and b) your
regulations allow that. If you get it you can use the five speed box from an
sdi 3500 if thats easier as its the same box.
Gernot
> ----------
> From: PScales[SMTP:pscales@blvl.igs.net]
> Reply To: PScales
> Sent: Monday, October 05, 1998 6:39 PM
> To: triumphs@autox.team.net
> Subject: 5 spd into 4 spd TR-7?
>
>
> Has anyone tried (successfully) to replace their TR-7 4 speed gearbox with
> a five-speed unit? Mine is a 1976 with dual carbs, and it runs well,
> etc.,
> but the engine is turning a bit fast on the highway (ie, 4400 rpm at 140
> kmh). I'd like to bring the revs down to about 3800, if possible, at
> highway speed.
>
> Is there a FAQ somewhere that might describe this change?
>
> People with 5 speeds: what rpm are you turning at highway speeds?
>
> Thanks gang,
> Peter
> Trenton, Ontario
>
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