Going to 4:10's
Thread Starter
On The Tree
Joined: Nov 2003
Posts: 175
Likes: 0
From: Pacific Beach/San Diego/US Navy,LSCM
Going to 4:10's At 70 MPH my speedodometer reads 1600 RPM's with 3:73's
4:10's what will my RPM's read at 70MPH.?
Thanks in advance
Rx Bruce/StoreKeeper99Z28
4:10's what will my RPM's read at 70MPH.?
Thanks in advance
Rx Bruce/StoreKeeper99Z28
off hand i remember that goin 74 is 2k rpms for me with 4.10s
but use this and it will show you everthing
http://www.f-body.org/gears/
but use this and it will show you everthing
http://www.f-body.org/gears/
Thread Starter
On The Tree
Joined: Nov 2003
Posts: 175
Likes: 0
From: Pacific Beach/San Diego/US Navy,LSCM
http://www.f-body.org/gears/
It did not tell me much
Right now the with 3:73 on 275/35/18= 70MPH = 1600 RPM's
I want to know at 70MPH what will my RPM's be with 4:10's
Rx Bruce
It did not tell me much
Right now the with 3:73 on 275/35/18= 70MPH = 1600 RPM's
I want to know at 70MPH what will my RPM's be with 4:10's
Rx Bruce
TECH Senior Member
iTrader: (10)
Joined: May 2005
Posts: 5,353
Likes: 2
From: Bossier city,LA barksdale AFB
damn im about to put 4.10s in my car now. The stock 3.42s in my car @ 2000rpms is 90mph that sucks im going to loose that much 
Well is going to keep me from speeding! My car cruises sp good @ 200rpms and every time i go somewhere im doing 90 in a 65 -70mph zone LOL So now that will put me around the speed limit lol. I wanted 3.90 gears but i got 4.10s for free
Well is going to keep me from speeding! My car cruises sp good @ 200rpms and every time i go somewhere im doing 90 in a 65 -70mph zone LOL So now that will put me around the speed limit lol. I wanted 3.90 gears but i got 4.10s for free 
TECH Apprentice
Joined: Feb 2002
Posts: 363
Likes: 0
From: Brook Park, Ohio
If the only thing you're changing is gears, then all you need to do is multiply your current rpm by 4.10/3.73 to get your rpm with the 4.10 gears. So if the 3.73s turn 1600 RPM @ 70 mph, the 4.10s will turn 1600 x (4.10/3.73), or 1759 rpm, @ 70 mph.
