[TR] TR4A update and overdrive question

[David Porter]

O/D's are not very smart. They are either on or off. That being the 
function of the fitted lock out switch(s).
Dave P
On 6/4/2015 10:37 PM, Randall wrote:
>> The other thing I noticed about the OD is the switches on the
>> shifter allow the transmission to go into OD in 2nd, 3rd, and
>> 4th.  I thought only J-type overdrives switched in the 3 top
>> gears.  The tag on the OD doesn't say A or J.  It just says
>> Laycock De Normanville: Serial # 22/61753/003197,
> That's an A-type, the later variant with the smaller accumulator as fitted to TR4A IRS and (some) later cars.
>
> It should be enabled in 2nd, 3rd & 4th.  Some early TR2 A-types only worked in 4th gear, but most were 2,3,4.
>
> J-types normally only work in 3rd & 4th (unless modified of course).
>
> Someone mentioned D-type; those were not used on the 'big' TRs.  Only early Spitfire and GT6, AFAIK (although there might be some
> others).  The D-type is smaller and weaker, marginal even behind the 2.0 6 banger.
>
> -- Randall
>
>
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-- 
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM 
87107 505-352-1378 Go HERE: my world www.porterbikes.com/