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Discussion Starter #1
Will taller rear tire size help lower engine rpm on the road, especially on the highway? I have a 373 rear that screams on the highway . I would like to take longer trips but it is not a hwy car. I know a change of gears would make a difference.It would be much easier to change tires
 

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yep!
 

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going from a 26" tire to a 28" tire will drop your rpm a couple hundred, but it will throw the speedo waaaay off, and if you don't know how much, you will get a speeding ticket out of it eventually.
 

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Discussion Starter #4
so going from a 245/60 /15 to a 275/60/15 should fit and drop the rpm may 200 rpm or so
 

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I changed from my stock, D-70/14 redline's to 9.50/14 Mud&Snow's right after I bought my car.

Went from a 25.3" to 5" tall tire to a 29.5" tall tire by raising my rearend up about 4" using coil-over shock overload springs.

Speedometer went from 3070/3050 or so rpm at 70 mph to 82!!!

AND I got a ticket and that's what the Trooper said I was running..

She topended out to 145 mph just as smooth as can be back then..

pdq67

PS., M-20 and 3.31's car!!!
 

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My Camaro with 3.73's and 27.5" tall tires is 3000ish at 65mph. Hope that helps.
 

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Discussion Starter #8
on the hwy I am going about 55- 60 @ 3000 with 245/60 /15- 3.73

it is alot easier and cheaper to get larger tires. Rear is 1 -2 years on rebuild.
I hate having all the people pass me by because of the high RPM on the motor on hwy
 
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