- #Gear ratio calculator f body manuals#
- #Gear ratio calculator f body update#
- #Gear ratio calculator f body manual#
- #Gear ratio calculator f body code#
Go for a ride and scan your calculated 3rd gear ratio. This would be a trial and error method since there really isn't a basis that i can figure out. Easiest way to get this to work is to keep checking your vss number and get a 3rd gear ratio of 1:1. What about people that change out the diff from the 3.29 ratio to the 3.05 and go with 3.41 gearing.Ouch, i'd start with a stock bin and go under the speedo tab.
#Gear ratio calculator f body code#
Go for a ride, command 3rd gear using the shifter and see what it reads, if it reads anything but 1.00 you'll throw a wrong gear ratio code and should adjust from there (this shouldn't be the case however unless you changed something else) A good way to check is by scanning your 3rd gear calculated ratio. These should get it very close, may take some fine tuning to dial in the shifts. Save the file, flash it to the car and go for a ride. If you're using a 3.69 sprocket ratio type in 4.11 commt. If you're using a 3.29 sprocket ratio type in 3.69 commit. Type in your stock tire size (should be listed to the left, carry it over). On the top you see tire size and gear ratio. Takes a slightly different approach than say changing the ratio in an Fbody. Under the speedo tab is the gear ratio conversion feature. Leaving all the values in the speedo calc's stock. In essence you will change your sprocket ratio and tweak VSS pulses per rev trans, then back calculate your VSS pulses per mile (if you want to). The other thing i've found is leave the trans revs per mile stock, no matter what, even using my spreadsheet to change it to work with the tires it screws up the tcc calcs and caused me a year of aggravation trying to figure it out. So mine was 9.118 (from my spreadsheet) and my calculated ratio was reading 1.25. I test drove the car after making the necessary changes and then fixed it. so that in 3rd gear the calculated ratio reads 1.00.
#Gear ratio calculator f body update#
Here's an update to this, in order to fix the car so it won't throw a wrong gear ratio code you have to change the VSS pulses per rev trans.
#Gear ratio calculator f body manuals#
Now, you may get a wrong gear ratio code set by doing this DO NOT DISABLE the CODE, this can potentially cause damage to the transmission by commanding excessive and unnecessary pressure (from what I’ve read in GM service manuals and many transmission guys have mentioned this). Click commit and bang done, this will get them very close, they will require some fine tuning to dial them in. Under the speedo tab click the button which says "manual scale" and scale them by the necessary value (i.e., 2.93/3.69=.794, 2.93 stock and I went to 3.69). All values are changed under the speedo tab in HPT.Īlso, to make this work correctly you will need to scale your shift tables which can be done very easily. I've tried to make it as simple as possible, enter the highlighted values and it will calculate the correct input. I'm using 3.69's and a larger tire than stock so note that if you are using it. I know this question has come up several times and nobody really has an answer. It has worked for me so I’m thinking some others may be interested possibly maybe make this a sticky. I wrote this spreadsheet to calculate all the necessary values for doing a gear swap. If you are measuring your tire, measure from flat ground up to the center of the hub and multiply that number by 2.For the FWD 3800 guys (4t65E transmission) If you are using the calculated diameter, multiply that number by. ***The diameter column is assuming actual tire roll out mounted on a vehicle, not the calculated diameter. Automatic transmissions will run a slightly higher RPM do to slippage.
#Gear ratio calculator f body manual#
This chart is based on a drive gear of 1:1 at 65 MPH using a manual transmission. Then reference your new tire diameter with your choice of RPM to find the new gear ratio needed to supply you with that RPM. Using the chart, first cross reference your current gear ratio and tire diameter to find your approximate RPM at 65 MPH.
If you are looking to retain your stock feel or change your gearing to the optimal ratio, then you will need this gear ratio chart to do so. Changing tire size will ultimately affect the power and drivability of your vehicle.
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