[TR] OD gear box question

[David P]

I only cut the left side factory mount off as it directly hit the 
($200+) solenoid and used the factory angled rubber bush cross mount on 
angle and square iron bits. So, the rubber bits can be replaced, but the 
cross piece has to be partially removed to remove the drive shaft. A 
small inconvenience for the next luck owner..   A types were 22% or 
28%.. I'm thinking the J is 25% ? With the newly added 3.45:1 rear gear 
set 70MPH is showing 2600RPM. Nice for our NM long distances.... Factory 
is saying 90wt gear oil... what is your recommendation for oil?  Seems 
heavy for cold weather temps.  DP

On 11/30/2021 7:59 AM, DAVID MASSEY wrote:
> Not off hand but it is better than what you get with the A-type.  What 
> I recall is that 3000 RPM will give you 75 MPH with an A-type and 78 
> with a J-type.
>
> Yes, I did it with some angle iron and a stack of rubber washers.  I 
> have since switched to a newer frame from a '73 so I am back to 
> factory-fit.  A local club member put a J-type in his '71 but I 
> haven't seen how he did it.
>
> Dave
>
>
>
> -----Original Message-----
> From: David P <frogeye at porterscustom.com>
> To: DAVID MASSEY <dave1massey at cs.com>; triumphs at autox.team.net 
> <triumphs at autox.team.net>
> Sent: Tue, Nov 30, 2021 8:40 am
> Subject: Re: [TR] OD gear box question
>
> Yes, J type for a 71' TR6    Yep, some angle iron made it work.. No 
> drilling needed... a MIG yes.. LOL Dave, do you know the reduction 
> percentage of the J type?  dp
> On 11/30/2021 7:34 AM, DAVID MASSEY wrote:
> Did you get the A-type or J-type overdrive.  They switched in 1973 
> from the A to the J-type and modified the frame to suit.  The J-type 
> is not a direct fit.  It can be done but it is an unorthodox 
> mounting.  IOW: roll your own.
>
> Dave
>
>
>
> -----Original Message-----
> From: David P <frogeye at porterscustom.com> 
> <mailto:frogeye at porterscustom.com>
> To: Triumphs (triumphs at autox.team.net 
> <mailto:triumphs at autox.team.net>) <triumphs at autox.team.net> 
> <mailto:triumphs at autox.team.net>
> Sent: Tue, Nov 30, 2021 8:13 am
> Subject: [TR] OD gear box question
>
> Owners,   I acquired a Factory OD gear box for my '71 and discovered
> that the transmission mounts on my chassis do not correspond to the
> mount on the box... So, were the cars ordered with OD modified at the
> chassis mount location?
>
>  With the OD, removing the driveshaft becomes a bit more
> problematic...due to moving the mount rearward nearly 6 inches. DaveP
>
> -- 
> Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 
> My World go here: WWW.PORTERBIKES.COM/ <http://www.porterbikes.com/>
>
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> Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World go here:WWW.PORTERBIKES.COM/  <http://www.porterbikes.com/>

-- 
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World go here:WWW.PORTERBIKES.COM/
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