View Full Version : rear end gear swap! Whats the diff from 3.42 gears to 3.73
04-18-2012, 01:19 PM
Whats diff on my 1/4 mile if I swap the gears?
04-18-2012, 01:53 PM
maybe .2-.3, but it all depends on the engine, when the shifting occurs and where the engine makes power
typically less of a difference if you have less power, more if you have more power
sometimes changing gears will make you run out of RPMS too fast, causing shifts that were not there before, which can actually slow you down in terms of ET
04-18-2012, 02:03 PM
Got a 06 chevy! waight proble about 6300 lbs an on 22s its making about 330 rwhp an 305 tq motor proble making about 410 hp or lil more 3000 stall! I ran a 8.7 @ 77 mph the 1/8 an my 60ft was 1.87 an I was on 22s with street tires nvr could stall it an launch and my rpm is set at 6450! 1st gear goes to 60 an 2snt gear is 110 mph red line
1988 GMC 355
04-18-2012, 02:28 PM
then 3.73's will help
04-19-2012, 06:51 AM
I'd run the tallest gear without having to shift to 3rd.
04-23-2012, 01:54 AM
I came stock with 3.73s and they were pretty lame. Swapped to 4.10s and it sucks a little less now. With such a tank of a truck, you could prob trap 2nd with 4.10s. Have you run it past the 1/8th yet to see? Or will you only run the 1/8th?
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