Transmission goes boom.

[Erik the Awful]

One of my kids wanted to start hopping up his V6 Mustang. I managed to convince him to keep it stock, and when he can afford it, buy a second Mustang with a V8 and hop that one up. Then he moved out and now he can't afford to hot rod on a Whamalart salary, especially since he doesn't have a garage.

 

[kennythewelder]

Here is a chart on the gear ratios in different transmissions. The 700R4, 4L60, and 4L60E have the lowest 1st gear ratio. Ok 4L60E haters, post up.

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[stutaeng]

Here is a chart on the gear ratios in different transmissions. The 700R4, 4L60, and 4L60E have the lowest 1st gear ratio. Ok 4L60E haters, post up.

You must be registered for see images attach

That's actually a bad thing if remember! Look at the difference between 1st and 2nd for this and the other trannies...

Something about the ratios being TOO far apart?

 

[618 Syndicate]

I would think that a lower first gear ratio shows it's designed for applications making less torque. I'm not an engineer, but lower gears are a torque multiplier....

 

[PlayingWithTBI]

I'm not an engineer, but lower gears are a torque multiplier....

Yes, same as rear end gears, so you can work with both for your final ratio. If you take the 4L60E's 1st gear @ 3.06 and divide by the 4L80E's @ 2.48, you get ~1.23. Then take 4.56 rear end ratio and divide by 3.73, you get ~1.22 so, If I did my calculations right (who knows) you'll have about the same torque and overall gear ratio in 1st gear. Although you'll be spinning a little higher in the rest of the gears (with the 4L80E) but not by a lot.

 

[Supercharged111]

1st and 2nd take a hit, 3rs feels the same, 4th is better. The converter is MASSIVE, going to an aftermarket converter would definitely help regain some of that through 1-2. Shift recovery is noticeably improved, and the looser B82 converter stalls higher which helps too.

 

[stutaeng]

Yes, same as rear end gears, so you can work with both for your final ratio. If you take the 4L60E's 1st gear @ 3.06 and divide by the 4L80E's @ 2.48, you get ~1.23. Then take 4.56 rear end ratio and divide by 3.73, you get ~1.22 so, If I did my calculations right (who knows) you'll have about the same torque and overall gear ratio in 1st gear. Although you'll be spinning a little higher in the rest of the gears (with the 4L80E) but not by a lot.

I'm not following you here... For everything else being the same, the numerically higher gears have a greater 'mechanical advantage." I think you multiply tranmission gear ratios and rear end ratios to compare the overall drive ratio? Can't remember at the moment.

At least on the late 90s trucks, the 4L80e came with 3.73s and higher, while the 4L60e came with 3.73s and lower, but that was mostly because of the heavier curb weights and difference in GVWR...just different vehicles.

Tranny strength is independent of gear ratios though and vice versa. Has nothing to do with it...

And yes, the stock 4L80e torque converter is damn freaking ginormous! The aftermarket ones are lighter and you can get a higher stall.

 

[Supercharged111]

In the case of the T56 and TR6060, gear ratio dictates torque rating. I believe this to be because the bigger drive gear is stronger, but I'm not certain. Autos use planetaries so not sure how it affects them if at all.

 

[PlayingWithTBI]

I think you multiply tranmission gear ratios and rear end ratios to compare the overall drive ratio? Can't remember at the moment.

Yeah I went about it a little different but, with your formula - 3.06 X 3.73 = 11.4 while 2.48 X 4.56 = 11.3. Still pretty close to the same. My point was, trans gear ratios are only a part of the equation. Rear end ratio and tire size need to be included.

 

[stutaeng]

Yeah I went about it a little different but, with your formula - 3.06 X 3.73 = 11.4 while 2.48 X 4.56 = 11.3. Still pretty close to the same. My point was, trans gear ratios are only a part of the equation. Rear end ratio and tire size need to be included.

Ok gotcha!

I was wondering where the 3.73 and 4.56 numbers were coming from...doh!