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Old 04-01-2014, 12:39 PM   #1
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Question about my gears

New member here, Just bought my mustang and was wondering if my car has gears or not. It has many other upgrades (cold air intake, steeda underdrive pulleys, o/r h pipe, subframe connectors, flowmasters,etc) so i was wondering maybe he upgraded the gears too. Payed $2000 (poor guys dad has cancer) for it so this was beyond a steal and it runs great. It is a 99 automatic and when im at 55mph im sitting at 2000 rpms. If my gears are stock can anyone tell me which gears i should go with. Not really worried about gas mileage because i did not buy it to be fuel efficient.
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Old 04-01-2014, 12:52 PM   #2
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Do u know what gear the car is in at 55 I it could be 4th gear that the transmission is in.
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Old 04-01-2014, 01:21 PM   #3
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Jack up the rear end, make a crayon mark on the driveshaft and tire, rotate the tire one full turn and count how many revolutions the driveshaft turns. Stock is 3.27 so that would be three and a quarter driveshaft turns. My guess is you have 4.10s or possibly 4.30s
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Old 04-01-2014, 01:23 PM   #4
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He has a 4 speed. And I think the OD in that is .7x so I think he may have stock gears.
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Old 04-01-2014, 01:29 PM   #5
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Quote:
Originally Posted by Riverdale View Post
New member here, Just bought my mustang and was wondering if my car has gears or not. It has many other upgrades (cold air intake, steeda underdrive pulleys, o/r h pipe, subframe connectors, flowmasters,etc) so i was wondering maybe he upgraded the gears too. Payed $2000 (poor guys dad has cancer) for it so this was beyond a steal and it runs great. It is a 99 automatic and when im at 55mph im sitting at 2000 rpms. If my gears are stock can anyone tell me which gears i should go with. Not really worried about gas mileage because i did not buy it to be fuel efficient.

Go 70 and report back on rpm's. Makes it easier
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Old 04-01-2014, 01:42 PM   #6
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ok i will get it up to 70 after my class is over.. and yes im in 4th gear at 55
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Old 04-01-2014, 02:18 PM   #7
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If he has gears the speedo won't read right unless the person did a speedcal or a custom tune to the computer. Only way to be 100% sure is to jack up the rear (stupid easy with subframes) and do the crayon trick.

Your next mod, if not already done, is to do the j-mod. Look up "j-mod tccoa" on youtube for a how to video. It might seem daunting but if you can use hand tools and a drill and are not an idiot, its not. You basically remove the valve body and enlarge a few holes in the separator plates and remove a few springs from the trans. This acts like a shift kit and also has the added benefit of increasing transmission life.

edit: You can always download a GPS app to your phone and get an accurate speed rating that way. Then just plug in your RPM, tire height (stock is 25.7") and a .7 final gear to the RPM calculator (google it) and then start punching in different gear ratios to see what you have. Try 3.27, 3.55, 3.73 and 4.10.

Or do the driveshaft trick...
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Old 04-01-2014, 03:48 PM   #8
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Just do the drive shaft trick like they said. Easiest way.

---------- Post added at 03:48 PM ---------- Previous post was at 03:48 PM ----------

Quote:
Originally Posted by scottydsntknow View Post
If he has gears the speedo won't read right unless the person did a speedcal or a custom tune to the computer. Only way to be 100% sure is to jack up the rear (stupid easy with subframes) and do the crayon trick.

Your next mod, if not already done, is to do the j-mod. Look up "j-mod tccoa" on youtube for a how to video. It might seem daunting but if you can use hand tools and a drill and are not an idiot, its not. You basically remove the valve body and enlarge a few holes in the separator plates and remove a few springs from the trans. This acts like a shift kit and also has the added benefit of increasing transmission life.

edit: You can always download a GPS app to your phone and get an accurate speed rating that way. Then just plug in your RPM, tire height (stock is 25.7") and a .7 final gear to the RPM calculator (google it) and then start punching in different gear ratios to see what you have. Try 3.27, 3.55, 3.73 and 4.10.

Or do the driveshaft trick...

+1
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