Help me find out what speed im going after 4.10 install
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PonyGrl420
Founding Member
Its not going to be a constant speed difference. The faster you go the more it will be off. Im sure there is a chart on the web somewhere.
willys1
Active Member
When Im doing 60,my speedo says 85!! I had the same gear change.Gulp, I guess I am going to have to stick with traffic, and go by the chart I made.
I used this calculator http://www.slowgt.com/Calc1.htm#RPMInGear to come up with these numbers:
15 mph 1st gear= 2,000 rpm
25 mph 3rd gear= 1,400 rpm
35 mph 3rd gear= 2,000 rpm
40 mph 3rd gear= 2,217 rpm
45 mph O/D = 1,664 rpm
I used the correct gear ratios and my tire size of 225/50/16.
I think I will be ok, I just need to be careful. Thanks guys.
I used this calculator http://www.slowgt.com/Calc1.htm#RPMInGear to come up with these numbers:
15 mph 1st gear= 2,000 rpm
25 mph 3rd gear= 1,400 rpm
35 mph 3rd gear= 2,000 rpm
40 mph 3rd gear= 2,217 rpm
45 mph O/D = 1,664 rpm
I used the correct gear ratios and my tire size of 225/50/16.
I think I will be ok, I just need to be careful. Thanks guys.
willys1
Active Member
I use the tach when Im in traffic,I have an aod,stock 225/55/16 inch tires.and 373 gears,at 60mph Im at2100rpm/70mph-2300rpm/80mph-2500rpm.At low speeds I just wing it !!
www.hanlonmotorsports.com has a gear ratio calculator that tells you what speedo gear you should have. It's a very easy thing to swap out - disconnect your speedo cable and plug on the tranny, undo the bolt holding that unit in and pop it out. Remove the U-clip and swap gears, replace the U-clip, pop the unit back into the tranny, rebolt, plug in the cable and junk, and you're good to go. 
Ash
Ash
willys1
Active Member
PonyGrl420
Founding Member
the 3.73 speedo gear helped me out a lot when I had 4.10's. Its still a lil off though, but its a lot better then nothing.
willys1
Active Member
- Jul 17, 2001
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PonyGrl420
Founding Member
willys1 said:
I dont rember for sure, I havent had the car in a while. I dont think it was that much though like 10-15mph but im not positive
willys1
Active Member
ok...with the 4.10 in and the white speedo gear that is for the 3.73, you will be one mph higher for every 10 you are going. example when going 10mph you will read 11mph. when going 40mph you will read 44mph and when going 90mph you will read 100mph. i had one of my buddies ride next to me and we had walkie talkies and said how fast we were going back and forth and it was pretty much dead on to the 1mph higher for every 10mph you are going. hope that helps.....
its funny, every car i go in thats not mine, i automatically read 1mph higher for every 10 im going. its just automatic right now and dont even think about it
its funny, every car i go in thats not mine, i automatically read 1mph higher for every 10 im going. its just automatic right now and dont even think about it
willys1
Active Member
LOL,,,,,thats pretty good!!! I guess thats the best way to do it,if you dont have a dyno!!---Walky Talky's--LOL,,Im not laughing at you,thats just a unique idea
hehe...we use them all the time to pick on ricers. he has an 01 cobra vert and my car is dead even with him speed wise so we get to have our fun. i got sick of not knowing my speed so i devised a way to get it down perfectly....it almost always dead on when i go by those radar signs by schools and stuff 
