A4 vs A3 Gearing
09-08-2009, 07:07 AM
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A4 vs A3 Gearing At what point does it become beneficial to go from A4 to A3 given differences in 1st and 2nd gear? HP/Weight is only factor I can think that would determine the answer. Anyone have a clue?
Transmission 1st 2nd 3rd[/B]
TH400/3L80 2.48 1.48 1.0
4L60E 3.06 1.63 1.0
Transmission 1st 2nd 3rd[/B]
TH400/3L80 2.48 1.48 1.0
4L60E 3.06 1.63 1.0
09-08-2009, 08:56 AM
#2
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Most folks makes the A4 to A3 swap because they are swapping in a more race oriented, durable transmission.
Some folks might like the taller first gear of the A3 for big nitrous or even a turbo setup, but that's not a driving factor for most.
You might find that a powerglide swap for some is driven by desire to go to a very tall first gear, AND to now just require one shift during the whole pass.
Some folks might like the taller first gear of the A3 for big nitrous or even a turbo setup, but that's not a driving factor for most.
You might find that a powerglide swap for some is driven by desire to go to a very tall first gear, AND to now just require one shift during the whole pass.
09-08-2009, 09:33 AM
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kjhkjh Most folks makes the A4 to A3 swap because they are swapping in a more race oriented, durable transmission.
Some folks might like the taller first gear of the A3 for big nitrous or even a turbo setup, but that's not a driving factor for most.
You might find that a powerglide swap for some is driven by desire to go to a very tall first gear, AND to now just require one shift during the whole pass.
Some folks might like the taller first gear of the A3 for big nitrous or even a turbo setup, but that's not a driving factor for most.
You might find that a powerglide swap for some is driven by desire to go to a very tall first gear, AND to now just require one shift during the whole pass.
09-08-2009, 02:55 PM
#4
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once you start making lots of HP you want a taller first gear so you dont have soo much torque multiplication on the starting line... harder to control wheel speed...
nitrous and blower guys make lots of bottom end torque
turbo guys need to load the cars in low to make them spool fast and they mph like hell...
nitrous and blower guys make lots of bottom end torque
turbo guys need to load the cars in low to make them spool fast and they mph like hell...
09-08-2009, 08:00 PM
#5
I originally decided to go a th400 based on the ability to build and maintain one at a low cost.
It ended up being an additional benefit because I will be spraying out of the gate the wheel speed will be kept down through first gear which will obviously make me less prone to spin. (As mentioned above)
It ended up being an additional benefit because I will be spraying out of the gate the wheel speed will be kept down through first gear which will obviously make me less prone to spin. (As mentioned above)
09-08-2009, 10:09 PM
#6
I originally decided to go a th400 based on the ability to build and maintain one at a low cost.
It ended up being an additional benefit because I will be spraying out of the gate the wheel speed will be kept down through first gear which will obviously make me less prone to spin. (As mentioned above)
It ended up being an additional benefit because I will be spraying out of the gate the wheel speed will be kept down through first gear which will obviously make me less prone to spin. (As mentioned above)
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09-09-2009, 09:10 AM
#8
A lot of people keep with the A4 due to the added noise of driving the car with a three speed. If the car doesn't see many street miles or you are, like me, one of the guys who will tolerate a lot of noise in a "street car" for the sake of performance then it should be fine.
09-09-2009, 09:14 AM
#9
Depending on your power output it can be an important feature of the th400.
A lot of people keep with the A4 due to the added noise of driving the car with a three speed. If the car doesn't see many street miles or you are, like me, one of the guys who will tolerate a lot of noise in a "street car" for the sake of performance then it should be fine.
A lot of people keep with the A4 due to the added noise of driving the car with a three speed. If the car doesn't see many street miles or you are, like me, one of the guys who will tolerate a lot of noise in a "street car" for the sake of performance then it should be fine.
09-09-2009, 09:08 PM
#13
Decent price. Usually to have an A4 built to handle the HP I will be making would be pretty expensive. Plus the car will barely be street driven so what the hell.
He is right though, if you have the money the 4L80E or 4L85E is a hell of a transmission. All in your budget and goals.
He is right though, if you have the money the 4L80E or 4L85E is a hell of a transmission. All in your budget and goals.
09-11-2009, 11:02 AM
#15
-In most cases, less parasitic loss
-Ease of rebuilding and parts are plentiful
-Taller 1st gear calms down the car and allows it to leave better
-4L60/4L60e/700-R4's are on the same level of a Th350, people use them since you get the O/D and its less parastic loss then a TH400/4L80e combo, BUT the ability to take power and abuse is VERY slim to none. For ever 100 that blow, one may hold together, but that guy is rebuilding that trans at minimum every season.
-4L80e is an expensive swap and does have more parastic loss then the already power hungry Th400 which detract from the swap. Still now adays it is an uncommon swap.
-These are my opinions, but I think they have some weight to them. Pick your trans to what your doing with the car.