T56 Magnum. What ratios?
09-27-2015, 12:21 PM
#1
T56 Magnum. What ratios? I am about to order a new T56 Magnum for my 67 Firebird project. Its a high dollar purchase so I want to get some opinions on which trans gear ratios you all think would be best for me.
Car will be 99% street with 1/4 mile action 2-3 times a year. I plan to drive it a lot on the street at least 3 days a week. I would say probably 70% city 30% highway driving.
engine for now will be a stock 6.2 L92 engine with full bolt ons. later will add a mild or moderate cam with good street manners and good power under the curve.
I haven't selected a rear gear ratio or tire size yet. I planned on tailoring those to match the trans.
would really appreciate some input. Thanks a lot
T56 magnum gear ratios:
close ratio - 1st 2.66; 2nd 1.78; 3rd 1.30; 4th 1.00; 5th 0.80; 6th 0.63
wide ratio - 1st 2.97; 2nd 2.10; 3rd 1.46; 4th 1.00; 5th 0.74; 6th 0.50
Car will be 99% street with 1/4 mile action 2-3 times a year. I plan to drive it a lot on the street at least 3 days a week. I would say probably 70% city 30% highway driving.
engine for now will be a stock 6.2 L92 engine with full bolt ons. later will add a mild or moderate cam with good street manners and good power under the curve.
I haven't selected a rear gear ratio or tire size yet. I planned on tailoring those to match the trans.
would really appreciate some input. Thanks a lot
T56 magnum gear ratios:
close ratio - 1st 2.66; 2nd 1.78; 3rd 1.30; 4th 1.00; 5th 0.80; 6th 0.63
wide ratio - 1st 2.97; 2nd 2.10; 3rd 1.46; 4th 1.00; 5th 0.74; 6th 0.50
10-06-2015, 09:33 AM
#3
For a mainly street application I would say go with the first option. IMO the longer gears help you on the street being able to stay in gear longer and not have to shift alot because you have crazy steep gearing.
Also seeing as how the whole setup probably doesn't weigh much you don't need the steeper gearing. Those move from the first option (in fbodies and corvettes) to the second was because of the increased vehicle weight (GTOs) that benefited from steeper gearing.
Also seeing as how the whole setup probably doesn't weigh much you don't need the steeper gearing. Those move from the first option (in fbodies and corvettes) to the second was because of the increased vehicle weight (GTOs) that benefited from steeper gearing.
10-13-2015, 03:42 AM
#4
Vehicle weight matters. I have an f-body trans which has the 1-4 of option one and 5-6 of option two.
With my car weighing 3000lb full the f-body gearing works nicely. A 3.55 gear with 25" tires still makes first all but useless. But the other gears are still good.
Unless your car is a tank I'd pick option one for sure. 3.55-3.73 gears would match nicely.
With my car weighing 3000lb full the f-body gearing works nicely. A 3.55 gear with 25" tires still makes first all but useless. But the other gears are still good.
Unless your car is a tank I'd pick option one for sure. 3.55-3.73 gears would match nicely.
10-16-2015, 12:27 PM
#6
9 Second Club
What rear/tyre/rpm combo are you using to hit 175mph ? Must be pretty tall ?
I use a basic T56 with the tall set 2.66 thru 0.5 and quite like the 0.74 5th. I considered changing it many times, but moving to the shorter ratios just wouldnt do anything for me, and I really like the tall 6th for cruising and long journeys. Hell...I've even found myself looking for 7th on occasion ! LOL
But without knowing the OP's power/weight and intended use etc, much harder to say what might work for him.
Lower power, go for shorter gears, more power go for taller gears.
I use a basic T56 with the tall set 2.66 thru 0.5 and quite like the 0.74 5th. I considered changing it many times, but moving to the shorter ratios just wouldnt do anything for me, and I really like the tall 6th for cruising and long journeys. Hell...I've even found myself looking for 7th on occasion ! LOL
But without knowing the OP's power/weight and intended use etc, much harder to say what might work for him.
Lower power, go for shorter gears, more power go for taller gears.