Changing rear end gears - what speedo gears do I need
Thread Starter
Joined: Aug 2006
Posts: 1,376
Likes: 7
From: Northern California - Bay Area
Car: 1988 IROC-Z
Engine: L98 - full intake & exhaust boltons
Transmission: Bowtie 700r4, 2400 rpm stall
Axle/Gears: Borg-Warner 9bolt, 3.45 gears, posi
Changing rear end gears - what speedo gears do I need
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.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Changing rear end gears - what speedo gears do I need
Thread Starter
Joined: Aug 2006
Posts: 1,376
Likes: 7
From: Northern California - Bay Area
Car: 1988 IROC-Z
Engine: L98 - full intake & exhaust boltons
Transmission: Bowtie 700r4, 2400 rpm stall
Axle/Gears: Borg-Warner 9bolt, 3.45 gears, posi
Re: Changing rear end gears - what speedo gears do I need
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
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