yaj15
Supreme Member
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Today
- Join DateAug 2006
- LocationNorthern California - Bay Area
- Posts:1,376
- iTrader Positive Feedback100
- iTrader Feedback Score(3)
- Car1988 IROC-Z
- EngineL98 - full intake & exhaust boltons
- TransmissionBowtie 700r4, 2400 rpm stall
- Axle/GearsBorg-Warner 9bolt, 3.45 gears, posi
- Likes:1
- Liked:7 Times in 7 Posts
Hey guys,
I am in the process of getting parts together to rebuild my Borg Warner 9bolt rear.
Currently I have 2.77 gears with a posi.
I am going to change the gear ratio to 3.27. What speedo gears to I need to have my speedo read correctly after I change gear ratios.
I am in the process of getting parts together to rebuild my Borg Warner 9bolt rear.
Currently I have 2.77 gears with a posi.
I am going to change the gear ratio to 3.27. What speedo gears to I need to have my speedo read correctly after I change gear ratios.
JamesC
Moderator
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Apr 15, 2026
Quote:
I am going to change the gear ratio to 3.27. What speedo gears to I need to have my speedo read correctly after I change gear ratios.
You might check the sticky at the top of the page for more info.Originally Posted by yaj15
Currently I have 2.77 gears with a posi. I am going to change the gear ratio to 3.27. What speedo gears to I need to have my speedo read correctly after I change gear ratios.
JamesC
yaj15
Supreme Member
close
Today
- Join DateAug 2006
- LocationNorthern California - Bay Area
- Posts:1,376
- iTrader Positive Feedback100
- iTrader Feedback Score(3)
- Car1988 IROC-Z
- EngineL98 - full intake & exhaust boltons
- TransmissionBowtie 700r4, 2400 rpm stall
- Axle/GearsBorg-Warner 9bolt, 3.45 gears, posi
- Likes:1
- Liked:7 Times in 7 Posts
I used the speedo gear calculator for 700r4 transmissions on Bowtie Overdrives website.
I am still using my stock IROC wheels - 245/50/16. Then I put in 3.27 for the axle ratio.
The output gave me Drive Gear with a 19 tooth count.
and a Driven Gear with a 34 tooth count.
http://700r4.com/speedoCalc/speedocalc.shtml
http://700r4.com/speedoCalc/speedocalc.php?A=sdfsdfsdf
I am still using my stock IROC wheels - 245/50/16. Then I put in 3.27 for the axle ratio.
The output gave me Drive Gear with a 19 tooth count.
and a Driven Gear with a 34 tooth count.
http://700r4.com/speedoCalc/speedocalc.shtml
http://700r4.com/speedoCalc/speedocalc.php?A=sdfsdfsdf