I run 3.42's in our bracket car (mid-low 11's on motor). 3.73's would be the ultimate, but highway driving will suffer a bit.
which gears
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Joined: Jun 2007
Posts: 64
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From: manteno il
which gears
i have a 97 c5 i just traded for my 89tta.it has a built ls1,dyno tune
Thunder Racing TRak cam 231/234 .640/.590 112 LSA. The heads on the car are PRC LS6 Stage 2 ported heads.dynoed at 403rwhp.my ? is the vette has 315 gears and i think i should go with a little taller gear for that cam.any suggestion.373,390,410 pros and cons please.
thanks jim
Thunder Racing TRak cam 231/234 .640/.590 112 LSA. The heads on the car are PRC LS6 Stage 2 ported heads.dynoed at 403rwhp.my ? is the vette has 315 gears and i think i should go with a little taller gear for that cam.any suggestion.373,390,410 pros and cons please.
thanks jim
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Joined: Jun 2007
Posts: 64
Likes: 3
From: manteno il
my trans is a built 4l60e stage 3 good for 650hp with a 3200 yank converter.the car had a 4000 stall when dynoed but it was to much for the street. i plan on taking to the 1/4 mile on weekends every now and then.
Last edited by 30th290; Oct 23, 2007 at 08:56 PM. Reason: oops
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Rear end ratios
GU2 Axle, Rear, 2.73 Ratio
GU6 Axle, Rear, 3.42 Ratio
G90 Axle, Rear, 3.15 Ratio
One other way. Drive in 3rd gear (automatic trans) at 75 mph on level ground, look at your rpm's. If your turning 3150, you have 3:15's. If you're turning 2730, you have 2:73's. Just move the decimal over to the left 3 places.
. Or... place your A4 into third gear and get on the highway. At a constant 75mph (making sure the TC has locked) read the rpm value; then divide it by 1000.(This also works with the six speed manual transmission using 4th gear):
examples:
2730 RPM........ you have a 2.73
3150 RPM........ you have a 3.15
3420 RPM........ you have a 3.42 (not a factory available ratio with the A4)
3730 RPM........ you have a 3.73 (not a factory available ratio)
3900 RPM........ you have a 3.90 (not a factory available ratio)
4100 RPM........ you have a 4.10 (not a factory available ratio)
(assuming rear tire height has not been altered from the factory height)
GU2 Axle, Rear, 2.73 Ratio
GU6 Axle, Rear, 3.42 Ratio
G90 Axle, Rear, 3.15 Ratio
One other way. Drive in 3rd gear (automatic trans) at 75 mph on level ground, look at your rpm's. If your turning 3150, you have 3:15's. If you're turning 2730, you have 2:73's. Just move the decimal over to the left 3 places.
. Or... place your A4 into third gear and get on the highway. At a constant 75mph (making sure the TC has locked) read the rpm value; then divide it by 1000.(This also works with the six speed manual transmission using 4th gear):
examples:
2730 RPM........ you have a 2.73
3150 RPM........ you have a 3.15
3420 RPM........ you have a 3.42 (not a factory available ratio with the A4)
3730 RPM........ you have a 3.73 (not a factory available ratio)
3900 RPM........ you have a 3.90 (not a factory available ratio)
4100 RPM........ you have a 4.10 (not a factory available ratio)
(assuming rear tire height has not been altered from the factory height)