4.10's
 

I have a Mach 1 with a tko 600 (.82 od) which is completely stock otherwise. What kind of ET gain could I expect from 4.10's?
I'm sure there are many threads about this but I searched and could not find them. Any info would be greatly appreciated.

3 tenths, maybe a lil more. Hope ya got some good rubber tho.

like rygi said hope ya got rubber, if not don't be to mad if you run slower times and a higher trap until you get some

it may not be that bad though as your tko isn't geared as low in 1st...2.97:1 vs. the 3650s 3.37:1.

thanks guys I was trying to decide if it was worth it, I already hit 2500 rps at 65 lol
don't know how much higher 4.10s would take it

Never knew a .2 difference in o/d would make that much of an rpm increase (6-700). With .62 o/d the rpm increase w/ 4.10s is 300. Going from the stock gear to 4.10s with your .82 o/d you may be as high as 3K @ 65. Just a slightly educated guess though.

Yeah when I had it installed the guy said it would only go up a couple hundred rpms. Going home, I was so surprised that I called my better half who had brought me to pick it up and asked her how fast she was going (thought about wrong speedo gear) but she was traveling the same speed I was lol
I still might do it though, I could still pretty much peg the speedo If I'm pulling 3000 at around 65, just be driving slower the rest of the time lol