wanted speedo pinion
Posted: 12 Jan 2015 08:25
just installed 3.45 diff in my TR7 much better on the highway but need 21 tooth speedo pinion because now the speedo reads slow. Lyle.
tr7triumph.com
The biggest site dedicated to TR7s on the web
https://www.tr7triumph.com:443/
wanted speedo pinion
Page 1 of 1
Posted: 12 Jan 2015 13:33
I am unsure of this myself but are the pinion and the gear which drives it a matched pair,or is the tolerance great enough to accomodate the different diameter/pitch or whatever it is that different teeth counts have.Just interested,Steve..
Posted: 12 Jan 2015 14:54
I think the 21 tooth pinion is the green one - don't have one but might help your search.
It would be the correct pinion for the 3.45 diff when used with a TR7 5 speed box fitted with the white 7 tooth output shaft worm gear.
Tony
<font size="1">1981 TR7 FHC Cavalry Blue
1980 TR7V8 DHC Jaguar Regency Red - sadly sold!
1977 TR8 FHC EFI Factory development car Inca Yellow</font id="size1">
It would be the correct pinion for the 3.45 diff when used with a TR7 5 speed box fitted with the white 7 tooth output shaft worm gear.
Tony
<font size="1">1981 TR7 FHC Cavalry Blue
1980 TR7V8 DHC Jaguar Regency Red - sadly sold!
1977 TR8 FHC EFI Factory development car Inca Yellow</font id="size1">
Posted: 13 Jan 2015 05:24
Hi,
IF you have start to remove the back of the box then can be easier just to have your speedo re-calibrated, that's what I done, over twenty years ago now when I fitted a 3.08:1 CWP and been fine, should get it done again really what with the 2.84:1 living back there.
Used these gents -
http://www.speedycables.com/
Cheers John
LIVE LIFE A QUARTER OF A MILE AT A TIME!
1976 Speke FHC BEAUTY FITTED WITH OVERDRIVE GEARBOX
1979 3.5 FHC CURRENTLY GARDEN ART !
1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!
IF you have start to remove the back of the box then can be easier just to have your speedo re-calibrated, that's what I done, over twenty years ago now when I fitted a 3.08:1 CWP and been fine, should get it done again really what with the 2.84:1 living back there.
Used these gents -
http://www.speedycables.com/
Cheers John
LIVE LIFE A QUARTER OF A MILE AT A TIME!
1976 Speke FHC BEAUTY FITTED WITH OVERDRIVE GEARBOX
1979 3.5 FHC CURRENTLY GARDEN ART !
1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!
Posted: 13 Jan 2015 08:14
yes the 21 tooth pinion is green and it should mesh with the existing gear.i should have mentioned it is a 5 speed box and I thought this would be the easiest way because its quite a simple job to remove the pinion.But hey guys thanks for the input. Lyle
Posted: 13 Jan 2015 09:27
yes the 21 tooth pinion is green and it should mesh with the existing gear.i should have mentioned it is a 5 speed box and I thought this would be the easiest way because its quite a simple job to remove the pinion.But hey guys thanks for the input. Lyle
Posted: 14 Jan 2015 19:41
I can confirm the green gear meshes fine with the original gear in the box, changed mine 20 odd years ago still looked fine when swapped to a new box a couple of months ago.
Posted: 22 Jan 2015 16:26