TVR 3000M Ford Type 9 Gearbox speedo drive gear

TVR 3000M Ford Type 9 Gearbox speedo drive gear

Author
Discussion

Gee Boo

Original Poster:

84 posts

188 months

Saturday 3rd October 2020
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Hello all, following a recent gearbox oil leak and strip down, I have noticed that the speedo drive gear is badly worn and will need replacing. Along with first motion shaft, lay shaft, bearings etc
The question is, my car was always showing 10mph slower than when compared to the satnav.
Is now the time to change the speedo gear (assuming that the current blue one from whatever donor car is incorrect).
Any ideas of the difference the various colour drives make? Anyone have experience of what colour aligns with a TVR 3000M Essex V6 with the type 9 box, standard diff and wheels.
Appreciate that this will vary depending on diff ratio and tyre size etc,
Thanks in advance Gav

Gee Boo

Original Poster:

84 posts

188 months

Saturday 3rd October 2020
quotequote all
Possibly, it’s just I suspect this gearing is from the doner vehicle .....

Gee Boo

Original Poster:

84 posts

188 months

Saturday 3rd October 2020
quotequote all
This issue is moving forward quite quickly amongst my friends it seems I need the number of teeth on the shaft /number of teeth on the plastic gear drive /size of wheels and the diff ratio and there’s a calculation That reveals all ........??