Does anyone know the following to be true. I am interested in throwing the R452 overdrive gear in place of the 5th gear in an R150F to bring down my cruising speed on the highway/freeway. I will have it coupled with a 1UZ and 5.29's in the rear. Would I simply be able to replace this single gear, or would I need much more (the whole cluster etc...)
Also, has anyone been able to chase down a supplier/vendor for parts on these transmissions in the US?
The R150 and 151 both have the same cluster gear ratio which is 1.482 and
both have the same overdrive gear ratio of 0.565. So 1.482 x 0.565 = 0.83 =
17% overdrive.
But the R154 has a cluster ratio of 1.117 and an overdrive gear ratio of
0.674. Therefore, 1.117 x 0.674 = 0.75 = 25% overdrive.
But if I use either the R150 or 151 overdrive gears (0.565) in my R154 its
1.117 x 0.565 = 0.63 overdrive.
The R452 also has a different cluster of 1.769 but also a different
overdrive gear ratio of 0.469 so 1.769 x 0.469 also = 0.83 = 17% overdrive.
But if I use these gears in my R154 it becomes 1.117 x 0.469 = 0.52 = 48%
overdrive.
No point in using the R154 overdrive gears in a R150/151 as its 1.482 x
0.674 = 0.99 !!!!!! You don't need another top gear.
But what if you use the R452 overdrive gears (0.469) in a R150/151. This
means 1.482 x 0.469 = 0.69 = 31% overdrive. There you have it, LOL.
