Ken asked
"where is it written in stone that the 3.7-1 ratio was for non OD cars
and the 4.1-1 was for OD equipped cars" (paraphrased.)
It's not in stone, but a usually reliable and well researched source
says...
"TR4 -produced 1961-1965
Transmission: Axle ratio 3.7:1. Overall gear ratios 3.7, 4.90, 7.43,
11.61, reverse 11.92:1. Synchromesh on all forward gears. Optional
overdrive 3.32:1 (with 4.1:1 axle ratio).
20mph/1000rpm in direct top gear, 22.2mph/1000rpm in overdrive."
Excerpted from: APPENDIX A, Technical specifications (P122)
"The Triumph TRs A Collectors Guide" by Graham Robson
Cheers
Don
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