Close ratio grey crashbox

[Gary C]

Just wondering if anyone has used Old Car Gearboxes in Moorabin for a taller 1st and 2nd gear upgrade in their grey powered race cars?

Or for that matter where to purchase the gear from, I have a mate in WA been waiting a long time for his.

Also the hassle of sending a box from WA to Moorabin.

Thanks, Gary

[Gary C]

C'mon Harv.

[weddo]

Gary, check with Ellis French on face book he is building a close ratio box at the moment.

regards

Weddo

[Harv]

C'mon Harv.

Sorry, got distracted by work  :(.

Haven't seen the grey crashie modified this way before - most of the mods I've seen have been replacements (with adaptor plates) for other boxes, for example:

a) Riley 2.5. It had a 4-speed manual overdriven transmission with the following ratios (the respective grey motor crashbox values are in brackets):
1st gear 12.93:1 (2.99:1)
2nd gear 8.03:1 (1.59:1)
3rd gear 5.6:1, or 4.11:1 in overdrive (1:1)
4th gear 3.9:1, or 2.87:1 in overdrive
Reverse 17.52:1 (2.99:1)
Even with the change in diff ratio (the Riley had 4.1:1 compared to the old grey motor at 3.89:1), this is a pretty torque-oriented gearbox. I assume that bolting one to a grey would have been for hillclimbers rather than those chasing top-speed.

b) BMC B-series. This is probably not the three-speed crashbox fitted to the Wolseley 24/80/Austin Freeway, but likely the four-speed all-synchro offered on the Marina. The Marina gearing is shown below (the respective grey motor crashbox values are in brackets):
1st gear  3.412:1 (2.99:1)
2nd gear  2.12:1 (1.59:1)
3rd gear  1.43:1 (1:1)
4th gear 1:1
Reverse 3.753:1 (2.99:1)
Note that the Marina box has the same top-end capability, but is lower geared in 1st gear.

c) Datsun 1600. The Datsun gearbox was either a four-speed manual (the F4W63L and F4W63L gearboxes) or five-speed manual (the FS5W60L and FS5W63A gearboxes). I’m assuming most people were chasing the five-speed manual, which had a top gear ratio of some 0.85:1 compared to the grey motor crashbox at 1:1.

d) Jag.

Cheers,
Harv