I am looking to find what rpm a good running 3.0 engine with automatic transmission should be running at in a 2000 ford ranger. It could be kind of helpful for other drivers wanting to know if their transmissions are shifting correctly at various speeds. I am not sure if my overdrive is working.
My tire size is p225/70 r 15 100s m+s . How do I find what the gears are in the rear-end? My truck came used and has a tow package. Thanks for the help in advance. and thanks to michigan66 for the info on how to post.Jmmm in Kansas City

 

One of the differential bolts has a tag on it that will tell what the gear ratio is. You can also get the info from the vehicle information tag that is on the rear side of the driver's side door. You will need a means of translating the code to your ratio. Try this for starters:
https://www.ford-trucks.com/forums/4...nd-widths.html

 

My 3.0 auto, with 3.73's runs about 2500 rpms in od at 70 mph.

 

giving the different possible ratios of the "overdrive" (or 5th) gear, its best to get a rpm based on direct (or 4rth) drive. (asumming a manual trans, use 3rd for a 4 speed auto o/d.) my 3.73 geared 4.0 turns about 2,600 in 4rth @ 55. its been awhile since ive had it to 70 to know what it does there. probly in excess of 3,000 id suppose. http://www.cardomain.com/ride/3216869

 

2006 4.0 4x4 auto 4:10 at 70 mph runs at 2600

 

I had a 1994 Ranger, and for about 4 years it would run about 2900 at 70. Then the tranny went out, so we put a rebuilt one in, and after it was all said and done, took it for a ride. Cruising down the highway at about 70, it was 2900 RPM's, then all of a sudden it dropped down to about 2500 RPM's and it was like "hey, where did that gear come from?" Apparently OD had been out of it for the last 4 years and we never knew. I dont know if your 2000 is the same, but our 94 had a spot for drive, and another for OD on the gear selector. When OD was burned out, switching beteeen D and OD made no difference. Now it makes a huge difference.

 

Thank you everybody that has replied so far! I have found out that my truck has
axle code 86 which = 3.73. Bigrigfixer has the closest match to mine, mine is a 3 speed automatic with overdrive.

 

peter94 , my truck doesn't switch back and forth. I presume that it is in OD because the non od light is not lit.

 

Yeah, that should be right, You should have a O/D cancel button on the end of your gear selector. Get on the highway, and maintain a steady speed (set cruise). Once your RPM's stabalize, press the O/D cancel button. I believe OD on these trucks is just torque converter lockup. If you press the button your RPM's should jump up, and then pressing the button again they should drop back down. This will tell you if your OD is working. Also on a newer vehicle like this, any problems in the transmission should be indicated by a DTC stored in the PCM/TCM. That or if you can get a hold of somebody that has a scan tool you can go into your transmission control module and see if there are any codes stored. They may not always set a check engine light