Transmission problem, maybe

[Dave884x4]

I have an 88 s-10 4x4 with the 2.8 in it. The car looks great and runs great, but it seems to run fairly high rpm on the freeway, almost 5000rpm at 65 - 70 mph. I wouldn't think this is normal, maybe my gauge cluster is messed up of something with the tranny, any ideas or places I can start trying to narrow down some possibilities would help, thanks

[MT-2500]

STD or auto transmission?
ID what transmission you have.
How is fluid and fluid level?
Is the trtansmission slipping or just not upshifting?
How many upshifts do you have?
On a normal take off what are the upshifts in MPH?
MT

[Dave884x4]

auto trans, 700r4, fluid is fine and level, doesn't leak, have not really paid attention to the up shifts, and acceleration is fine, I did notice while getting up to speed on the freeway one time that under constant acceleration it dropped into a lower gear then once I let off the gas a little the rpms jumped back up and felt like it just down shifted.

[MT-2500]

Count the forward gears
You should have 4 and a TCC lockup.
Give us your up shifts mph on a normal take off.
Check the TV cabel for being hooked up and working and proper adjustment.
Post back with info.
MT

[Dave884x4]

i will do that today and post back later, thank you

[Dave884x4]

ok, it shifts to 4th.

1st-2nd about 18mph
2nd-3rd about 31 mph
3rd-4th about 50-56 mph depending on how much throttle i give it, but on the the tach, it shows i am going past redline on every shift after 2nd, the motor does not sound like it is winding up that much, on the freeway, it shows up almost to redline when I do 70 mph, that cant be right. I know it is no sports car but whats the deal.

[MT-2500]

I would check your tach for reading right.
Watch the rpm reading on a scanner or another tach.
MT

[Dave884x4]

ok thanks