Does this sound about right?
4 posters
G3GM :: G3 Tech :: Engine & Driveline
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Does this sound about right?
At 70 mph my tac reads 2500,oil pressure is about 62 and temp is 200.
454 motor/350 trans and 273 gears.
thanx
454 motor/350 trans and 273 gears.
thanx
1973 454 MONTE- Donating Member
- Street Cred : 36
Re: Does this sound about right?
Yes, thats about right, especially if you want good gas milage. I have a 3.47 rear axle ratio and 27 inch diamater tires. I planned it where I would be doing 3,000 RPM at 70 and I hit it on the nose. Now, if I want to make a cross country trip all I have to do is throw some 29 inch diamater tires on it and get 5 to 10 MPG better. If you want a little more pep get a lower (higher number) rear axle ratio or a smaller tire and you will get a little more pep with a little less MPG. JB
JB2wheeler- G3GM Fanatic
- Street Cred : 28
Re: Does this sound about right?
JB2wheeler wrote:Yes, thats about right, especially if you want good gas milage. I have a 3.47 rear axle ratio and 27 inch diamater tires. I planned it where I would be doing 3,000 RPM at 70 and I hit it on the nose. Now, if I want to make a cross country trip all I have to do is throw some 29 inch diamater tires on it and get 5 to 10 MPG better. If you want a little more pep get a lower (higher number) rear axle ratio or a smaller tire and you will get a little more pep with a little less MPG. JB
thanx
I have a 3:42 (?) posi for it,but i like the 275-60-15 tires on it.so if i put this in everything will change?
1973 454 MONTE- Donating Member
- Street Cred : 36
Re: Does this sound about right?
Yes, if you have a 2.56 ratio and change to the 3.42 it will increase acceleration and decrease MPG and your top speed. Who needs to go 170 MPH anyway. JB
JB2wheeler- G3GM Fanatic
- Street Cred : 28
Re: Does this sound about right?
Not on city streets, I hope. JB
JB2wheeler- G3GM Fanatic
- Street Cred : 28
Re: Does this sound about right?
How about highways and interstates?! LOL. I've only been up to about 140 in my first Monte on a 10 lane interstate, and things happen fast at that speed, and you run out of room quickly.
yogreasygramma- G3GM Member
- Street Cred : 5
G3GM :: G3 Tech :: Engine & Driveline
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