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Per the below calculators 255/60-15 are 27.05" in diameter and you would need to use a RED 12 tooth drive gear and either a 27-Black or 28-Yellowtooth driven gear. Your calculated driven gear number is 27.439 (just barely closer to 27 than 28 so I'd probably pick 27) and falls pretty much in between. See below and check me: 200-4r Speedo gear calculator: https://www.tciauto.com/speedometer-gear-calculator
I spent some time on the phone yesterday with Chris at Bowtie Overdrives... great group
My geometry is good, my pressures are good... we dialed a touch, told me to take it for a ride and manually shift up... when I go from 3rd to OD if it doesn't go then shift back and forth while feathering the gas in the event something is hung up from sitting for a year. I did this today and could clearly see and feel going into OD.
OK the embarrassing part, I still feel like it's not going fully into OD... why? because im still higher in rpms at 55 mph and it dawned on me, the transmission was in a 450hp 55 chevy big block with 390 gears and 20" wheels... and I never changed the speedo gear. I fealt like I was going allot faster than 55 mph keeping up with freeway movement, never thought about the speedo gear in the 2004r till I was driving into my neighborhood and looked at my speedo going 25mph and knew that wasn't right.
Anyone know what speedo gear im looking for with this 2004r
Per the below calculators 255/60-15 are 27.05" in diameter and you would need to use a RED 12 tooth drive gear and either a 27-Black or 28-Yellowtooth driven gear. Your calculated driven gear number is 27.439 (just barely closer to 27 than 28 so I'd probably pick 27) and falls pretty much in between. See below and check me: 200-4r Speedo gear calculator: https://www.tciauto.com/speedometer-gear-calculator
Back when I did the install of the BTO 200R4 in my 73 I had a Holley 2175 carb and there was no adaptor for it. Using the information that I got from BTO I set my carb up and made a plate to attach the TV cable to.
Back when I did the install of the BTO 200R4 in my 73 I had a Holley 2175 carb and there was no adaptor for it. Using the information that I got from BTO I set my carb up and made a plate to attach the TV cable to.
I was going to buy that and use it but my Q-jet linkage was good, just went on a short ride with a GPS speedometer... going 50 mph showed about 38-39 on my dash speedometer, way off
03-23-2024, 04:35 AM
