Why am i at 2500rpm at 70mph?

[y87inside]

I thought the rear was stock. And as far as my tach being off...my car idles when warm at about 850 to 900 rpm's. I think thats about right. I got the car with 84000 on the odometer so maybe a few mods were done. its aboout time to change the rear fluid so when i get that done ill just count the teeth.

[key2emptiness]

i ran my car right now in D and it was about 2600-2800 at 70-75 miles. i have 3.42's. is that a bad range???

[Takumi Fujiwara]

Id say if u know u have 3.42 gears which it doesnt seem like u do, check the psi in ur tires, I ran pretty high rpm with 255x55x16s but I dont remember how high, Im @ 245x50x16 now and it runs dead on for 3.42 @ 70

[John_D.]

I have stock 3.42's and stock tires.

I get 1000 rpms per 30 mph in OD.

1000 rpms = 30 mph
2000 rpms = 60 mph
3000 rpms = 90 mph

2500 is halfway between 60 and 90, so it should be right around 75 mph.

[nino]

<blockquote>quote:</font><hr>Originally posted by Robafb:
same here, I run 3.73's and im right at 2500 at 70mph<hr></blockquote>

same here! 2500 rpms at 70 mph
but with 3.73s that is.