Changing internal gearing? (not final drive)

[Ron Vogel]

Is it possible? Since we are starting to see some peaky powerbands, the normal gearing is kind of crappy. Any possible swaps from 4l60's?

[Andrew_99GTP]

Do you mean change the gearing of 1st-4th? Like a whole internal gear swap from a different tranny.

[Ron Vogel]

Yup

[my97gtp]

Are the gear ratio's in a 4t60 different? Im not sure if you would be able to change the parts and make everyting still fit and work the way it should. Its been a long time since i was in autotrans class so hard to remember everything.

[Andrew_99GTP]

Are the gear ratio's in a 4t60 different? Im not sure if you would be able to change the parts and make everyting still fit and work the way it should. Its been a long time since i was in autotrans class so hard to remember everything.

That is part of the reason I was going to go to school one extra year. I planned on taking a year of auto classes (transmissions being one of the classes). But after thinking about it, it just wouldn't have been worth the extra money.


Ron why don't you just put some bigger tires on your car

[Trannyman95]

And you think YOU have it bad lol. The 4L60E transmission has a 3.06 first gear then jumps waaaayyy down to 1.6ish for 2nd! Thats ok, the M90 cars make so much torque everywhere it doesnt bother me, especially since RWD cars hook up My cutlass cuts low 1.6 60' times on drag radials in full street trim, with a 2200 rpm torque converter. After the car comes off the line its a very small powerband, between 4950 and 6800 all the way down the track. 1st gear is basically a lever to move the car. The above with was 3.73 gears. I was going to stick 4.10s back in but since I am putting a turbo on the car I will never go through the traps in 3rd with that or the 3.73s as i crossed the line at 6K rpm in 3rd with the 3.73s. The car has 3.23 gears in it now so I should be safe for a while. Ron back to your wanting to change gear ratios, I dont know of anyone that has done this with any fwd GM trans but for other rwd old transmissions there are kits but VERY expensive. Remember in changing ANY of the gearing you altering every gear ratio 1st - Reverse. If its a strip only car then I would go with a higher stall converter and run 3.29 or 3.69 gears to let the engine sit higher in the powerband. Traction is always the problem with these cars so it makes it hard to have a car that does everything everywhere.

[vermsta]

Allright seeing as some of you are looking for some crazy mods, i've been thinking about trying to modify bushings and washers to bearings, and i succesfully came up with two in a 4l60e trans, but now i have a 4t60e and it's time to get back to the drawing board.
Why change bushings and thrust washers to bearings?? Well...I can't prove it, but it is said that if you convert all the thrust washers in a c6 transmission to bearings you can salvage 15 hp to the wheels!!! I actually believe this because if you've ever taken apart a hondamatic you'd see how much resistence is taken off with barrel bearings instead of bushings.