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Old 01-12-2013, 01:11 PM
djtuzik djtuzik is online now
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blacktop 3.06 rear axle ratio on the HEMI

For all the blacktop hemi owners
215MM Rear Axle and the 3.06 rear axle ratio, what kind of MPG effect does it have? Are the RPMs much higher? is it annoying?
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Old 01-12-2013, 02:51 PM
Colts&Glocks Colts&Glocks is offline
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You are correct with regards to higher RPM's. Also, as you assumed gas mileage will suffer. Is it worth it for you to pay for parts and labor, and to get your pcm reprogrammed for the new gears? 0-60 times will be an ever so slight improvement over 2.65's. Again, do you think it's worth it? I don't. Just my opinion...
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Old 01-12-2013, 03:01 PM
djtuzik djtuzik is online now
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Quote:
Originally Posted by Colts&Glocks View Post
You are correct with regards to higher RPM's. Also, as you assumed gas mileage will suffer. Is it worth it for you to pay for parts and labor, and to get your pcm reprogrammed for the new gears? 0-60 times will be an ever so slight improvement over 2.65's. Again, do you think it's worth it? I don't. Just my opinion...
How much does that cost?
I just read up on it, the higher RPM are offset by tire size. So the reason why the blacktop package comes with the higher ratio, is because the tires are larger.
looks like gas milage is going to be very similar unless I put 18 inch tires on.
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Old 01-12-2013, 03:15 PM
Colts&Glocks Colts&Glocks is offline
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How much exactly I don't know. I'd say at least an EASY $500 at a wishfull minimum. I'd believe if you went ahead and did it you'd most likely regret it, as you'd see very little performance gain, and smaller mpg's and perhaps higher engine wear.
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Old 01-16-2013, 01:52 PM
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Originally Posted by djtuzik View Post
How much does that cost?
I just read up on it, the higher RPM are offset by tire size. So the reason why the blacktop package comes with the higher ratio, is because the tires are larger.
looks like gas milage is going to be very similar unless I put 18 inch tires on.
no, tire diameter is essentially the same...stock 235/55R18's are 28" tall, stock 245/45R20's are 28.4", so with the same gearing and RPM, speed will be off by approx 1.4%
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Old 01-16-2013, 07:11 PM
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I have the 3.06 gears and I consistently get 17-18mpg mixed and 24-25 mpg highway.
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Old 01-16-2013, 08:35 PM
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I have the 3.06 gears and I consistently get 17-18mpg mixed and 24-25 mpg highway.
I will be getting them in the car I order this week. Road and Track with the Super Track Pack.

The 3.06 gears will be good for about 2 tenths to 60 and maybe 3 in the quarter. MPG should be barely suffer.

To me they will have more jump across the RPM range and are VERY worth it to me. Gears are literally the best mod you can do for these muscle cars as far as raw performance.

3.06 is still pretty mild but stock for stock will pull away from a 2.65 R/T all day
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Old 01-17-2013, 05:26 AM
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Originally Posted by mblock66 View Post
I will be getting them in the car I order this week. Road and Track with the Super Track Pack.

The 3.06 gears will be good for about 2 tenths to 60 and maybe 3 in the quarter. MPG should be barely suffer.

To me they will have more jump across the RPM range and are VERY worth it to me. Gears are literally the best mod you can do for these muscle cars as far as raw performance.

3.06 is still pretty mild but stock for stock will pull away from a 2.65 R/T all day
Has that been tested? depends on the driver I think..
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Old 01-17-2013, 05:40 AM
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I went from 2.65 to 3.06

You will likely be disappointed, as I was.

3 tenths? No way that will happen, I don't think I saw a full tenth improvement, and I tracked it pretty regularly.
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Old 01-17-2013, 06:04 AM
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Quote:
Originally Posted by mblock66 View Post
I will be getting them in the car I order this week. Road and Track with the Super Track Pack.

The 3.06 gears will be good for about 2 tenths to 60 and maybe 3 in the quarter. MPG should be barely suffer.

To me they will have more jump across the RPM range and are VERY worth it to me. Gears are literally the best mod you can do for these muscle cars as far as raw performance.

3.06 is still pretty mild but stock for stock will pull away from a 2.65 R/T all day
you have to remember the tranny gearing is very deep, with first being 3.59:1, and OD only being .83....

dunno how much it'll be worth, as I've seen guys reporting stock regular r/t's running the same/similar times (13.5-13.7) as most published reports of R/T R&T with 3.06's...
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