[craftomatic]

Got the Tremec TKO 600 in it and in 5th it's geared 0.62, 2000RPM's doing 65MPH, and with stock tires (265/50R15). What's yer guess as to what my rear gearing is?

 

[JesterGrin_1]

Got the Tremec TKO 600 in it and in 5th it's geared 0.62, 2000RPM's doing 65MPH, and with stock tires (265/50R15). What's yer guess as to what my rear gearing is?

I do not think it is a .62 over. You have a choice with the TKO-600 of .64 or .82 over drive. But it looks to be either a 3.55 or 3.70 or 3.73 gear as these are with in 4mph of each other. As if you have a 3.55 you should run 67MPH and with the 3.73 you should run 63MPH with the .64 over drive.

 

[Fred Mann]

Got the Tremec TKO 600 in it and in 5th it's geared 0.62, 2000RPM's doing 65MPH, and with stock tires (265/50R15). What's yer guess as to what my rear gearing is?

Crafty, you say stock tires, but a 265/50/15 isn't stock. Are those what you really have?

 

[Elduderino]

jack it up, mark the drive shaft, and mark the tire. Spin the tire and count the drive shaft revs for ONE rev of the tire. Then look at the different options for ratios that year, then if its about 3 and a half revs, then about a 3.55, if its over 4, then a 4.11 maybe etc etc etc

 

[6880 Mike]

...265/50/15 isn't stock....

:agree:
The differential has a ratio code stamped on the bottom of it. Post the code. Ought to be reliable unless the gears have been changed.

:thumbsup:

 

[grumpyvette]

http://users.erols.com/srweiss/calcmph.htm


http://users.erols.com/srweiss/calcrpm.htm


http://www.csgnetwork.com/multirpmcalc.html

http://purplesagetradingpost.com/sumner/bvillecar/bville-spreadsheet-index.html#Average HP/Torque

http://www.miata.net/garage/tirecalc.html

 

[redvetracr]

jack it up, mark the drive shaft, and mark the tire. Spin the tire and count the drive shaft revs for ONE rev of the tire. Then look at the different options for ratios that year, then if its about 3 and a half revs, then about a 3.55, if its over 4, then a 4.11 maybe etc etc etc

:agree: your options are 3:08, 3:36, 3.55. 3.7, 4:11...it`s would be a long shot but a 3:90 was available "over the counter" but I don`t think it was a factory installed option.
...redvetracr