The Dragon

iTrader: (6)

Is it just a matter of finding a place from where to order the tranny gears and having my tranny guy do the swap?

I have a D&D Viper reinforced T56 with stock ratios that's ran perfect for years but I wanna do the 5th and 6th swap.

Thanks!

kgkern01

iTrader: (10)

1993 M29 and M28 have 5th and 6th ratios of .80 and .62. I believe you need just the gears and matching 5/6 countershaft.

The Dragon

iTrader: (6)

I read about the M28/M29 but didn't see it as a viable option for my needs.

I'd rather rebuild/upgrade my existing 5th and 6th since the rest of my tranny has the upgraded parts to handle twice the torque of an M28/M29.

jmd

iTrader: (4)

Depends what mainshaft you have; If it has a one-piece 5-6 driven gear, then it's a no-go on those ratios with production parts.

M28/M29 5th/6th would make 5th taller and 6th shorter, but might not suit your goals.

Jeremy@RPMTransmissions

iTrader: (12)

Like jmd said, it depends on your shaft. I'd say you probably have the Viper mainshaft which is designed like the factory f-body shaft with a press-fit area along with a small splined area. To do the Cobra 5th and 6th which has a 2 piece mainshaft gear you will need to switch the mainshaft out for an Aston Martin shaft that is fully splined in the 5th and 6th area like the Cobra was originally.

The Dragon

iTrader: (6)

Great info here.

From where could I order the Aston mainshaft?

Thanks guys!

jmd

iTrader: (4)

The Gear Box lists in on their site.