got this info a while back from KEAS thought it'd be interesting maybe helpful to share so enjoy! 2 Speed vs 3 Speed Automatic Transmissions in Drag Racing Applications There is a common belief that the more gears a transmission has, the better the car will perform over the � mile. It is also generally accepted that any time savings in the 1st 60 feet can have double the effect over the entire track. Torque Converters (efficient ones) multiply torque. Whilst they cost hp to run and create heat, this generated torque is what actually accelerates the car down the track. 3 Speeds Recently in the USA, some teams have been playing with the GM TH400 3 speed transmission. It has 2.48:1 1st gear ratio, 1.48:1 2nd gear ratio and 1:1 in 3rd. The problem was with all this leverage (1st gear ratio and the torque converter) they found they couldn�t get the car to hook up. These were big tyred, chassis cars with plenty of torque and the crews were no dummies. A simple calculation showed that a leverage ratio of nearly 9:1 was being realised. They then experimented with reducing 1st gear ratio and eventually settled on a 2.1:1 1st gear ratio. A later change to a Powerglide with a 1st gear ratio of 1.8:1 made virtually no difference to the cars ET or MPH. Turbo Charged Cars with Small Capacity Engines Turbo charged engines don�t produce the torque of big capacity or supercharged engines. Here the 3 speed can perform well. An advantage of turbo charged engines is the ability to control boost (hence hp). If traction were an issue then some ECU adjustments to the Waste Gate can rectify this situation. Road Cars used on the Drag Strip Generally an 10 sec and slower road driven car with minimal tyre/chassis modifications and nominal hp and will benefit from a 3 speed. The car will remain on the torque converter for shorter periods of time in start stop traffic. Increase the engine hp and traction becomes and issue. Add a transbrake and tyre shock on transbrake release is considerable. 2 Speed (Powerglide) Advantages- Proven � mile performer Performance parts readily available Strongest transmission on the market Reduced tyre shock on transbrake release Disadvantages- Diff Ratio becomes a compromise between 60ft time and end speed (MPH) 3 Speed Advantages- Still gaining market acceptance performance parts now becoming available Design flaws limit torque rating Diff Ratio suits both street and strip driving Disadvantages- Requires either boost control or tyre/chassis mods on big hp cars Parts can be expensive Some original photos have not been recovered yet.

Great Info In general if you want that 9sec pass on slicks, 2spd glide is the go, but if you want a fast street car with drivability, 3spd jatco in KEAS spec would be ideal. Any street car flat 12 or under is damn quick and you must run decent tyres if you want to keep out of polls and gutters when your right foot goes down Ill be using the 2spd glide to run low 9s once the combo is ready Some original photos have not been recovered yet.

yeh exactly thats why i will be giong 2 speed myself, i dont think the 3speed can handle hard launching thats needed for 9's and how can u beat the NEARLY unbreakable 2 speed?

does anyone no who does an adptor plate for a powerglide to rb30..... ive tried castlemaine rod shop but they only make one for a v8 powerglide???

havent looked into it too much but isnt that the one, as powerglides were used in old holden 8's? anyway maybe try protrans or even keas being from melbourne i dont think u should have any troubles in the vlt capital of aus Some original photos have not been recovered yet.

hugo race glide do a adapt for glide to Rb30 or RB26 but need to use a 6cyl glide as they are 2pce removeable bell housing

what about trimatics are they strong enuff odr does the cost of converting to it outway the cost of geting a 3 speed jatco in the car. because i think alot of factory 5L vl parts could be used to help with the conversion also vk back 6 cyl bits mite be simalar, and then just get an adaptor and the box done. im not sure of the cost to do a trimatic to a jatco or reliability of the 2

yeah the six cylinder powerglide is the way to go cause it has better ratio's than the v8 powerglides

RB30 (VL Type) Bellhousing to 6 cyl Powerglide adaptor $330.00

how strong will it be its just that more ppl have experiance with trimatics and i was curious as to how tuff they can be made would it cost more for a trimatic to get done to the same specs as a jatco or vice versa

whats the transman's contact phone number ???

he owns keas's i beleive

Does anyone know where to get a bell housing to suit an RB30 to c4 & for how much ?

whats so bad about 2 speed on street ? other than having a big stall converter