[Smoke Eater 67]

I was wondering if anyone could give me some advice as to which gear ratio I should be running. I am in the market for a 12 bolt posi rearend.

I have a 454 with a 700R4 trans that will be running about 500HP.

I would like to have some punch off the line but not sacrifice all of my MPG for cruising around. I am not building a grocery getter but at over $4.00 per gallon I don't want to get too crazy either. Is it possible to have my cake and eat it too? How about eating only half?

Thanks in advance for any help you can give!

Shane

 

[jonboy231]

I would go with 3.31 or 3.42 with the step 1st gear of a 700r4.

 

[pink panther]

i would go with 373's

 

[zeke67]

Lots of guys are going to tell you 3:42, but I love my 3:73's and TH700 (SBC).

 

[Mike72ss]

I would go with 3.31 or 3.42 with the step 1st gear of a 700r4.

X2.

Mike

 

[gusszgs]

3:42's or if your a little more on the aggresive side 3:73's......i would think the 3:73's would be better for you. jmo...jmo

 

[pnugene]

3:55 is a good compromise.

 

[jonathanch]

I have the same set up in my 66. 454/700R4 and 3:50 gears. She runs 2150 @ 70 MPH and last year go 14 MPG on 900 miles of the Hot Rod Power Tour.

 

[TCSS1970]

I think with 500 hp and big block torque with 3.73's you would need slicks to get it to hook. I'm a little south of 500 hp and I have 3.31's and I have to feather the gas in first to keep it hooked. If I mat it it just blows the tires off. 3.31's or 3.42's is my vote for a street car. And you'll still be able to light them up any time you want.

 

[oldtimer]

shane, in my 67, moser 12/bolt 3.42
502,lunati hr
ps hp 1000
th-400
11.62 @ 117.64
Leon

 

[Smoke Eater 67]

Thanks everyone for all the valuable information! I love this site! Now to find a rearend.

 

[jvoiles]

good luck on that rear end, I spent $1700 rehabbing a used 12 posi. All new internals and I am doing the labor.

 

[the heckler]

3.42 in mine. 496/600 - 700r4....best of both worlds - just likes the premium petrol on fridays and sundays (the only days it sees use)..