Gears & Axles - what rpms w/ 373s

What rpms will i be turning at 70mph going from a 273 (2100 rpms) to a 373 rear w/ factory wheels?
Also, my friend asked me how many tenths will i save from 0 to 60? I didn't know how to answer him. I am a seat of pants kind of guy. I think it is 4.9 stock but I am not sure? Thanks. Brian.

if 2.73s'=2100,then 3.73s' would =2870

if 2.73s'=2100,then 3.73s' would =2870

i was around 3k when i had 3.73s at 70mph.

if 2.73s'=2100,then 3.73s' would =2870

How did you figure that?

An online calculator shows 2400rpm @ 70mph with the new gearing the OP mentioned.

i was around 3k when i had 3.73s at 70mph.

Surely that wasn't with a 4L60E transmission unless you had like 24" tires.

How did you figure that?

An online calculator shows 2400rpm @ 70mph with the new gearing the OP mentioned.



Surely that wasn't with a 4L60E transmission unless you had like 24" tires.

lol youre right. i was around 2400. ive made this mistake before. :emb:

I guess they dont teach math in schools anymore!

true rpm,not factory tach as they generally indicate way too high,would be 2.73s'=1750 and 3.73s'=2400

the 2870 came from 'math' based on the OPs' 2100 with 2.73s'.

true rpm,not factory tach as they generally indicate way too high,would be 2.73s'=1750 and 3.73s'=2400

the 2870 came from 'math' based on the OPs' 2100 with 2.73s'.

Just to be clear, my comment was directed at the OP. It is a simple math problem and I cringe every time I see a question like this! It took him longer to ask the question then to do the simple math!

Joe

By the factory tach:
3.23s 2k @ 68mph
3.73s 2450 @ 68-70mph

"Just to be clear, my comment was directed at the OP"

I took your comment as intended for the OP.

i was around 3k when i had 3.73s at 70mph.

(2100/2.73)*3.73=2869rpm

Just to be clear, my comment was directed at the OP. It is a simple math problem and I cringe every time I see a question like this! It took him longer to ask the question then to do the simple math!

Joe

I am not a gearhead & did not know the simple math as you call it. If my question upset you so much you did not have to reply.
Thanks everyone else.

Just to be clear, my comment was directed at the OP. It is a simple math problem and I cringe every time I see a question like this! It took him longer to ask the question then to do the simple math!

Joe

Settle down cutie :gay:

lol...

I ran 1900rpm at 70mpg with 2.73s, now I run 1900 rpm at 55mph....about 2400rpm at 70

2400 is fine. Anyone know the difference between 0to60? My buddy who is going to pay half wants to know before it gets done?

The difference for 0-60? It depends on many factors in the car, of which the axle ratio is just one. It will certainly be noticeable though.

The difference for 0-60? It depends on many factors in the car, of which the axle ratio is just one. It will certainly be noticeable though.

Makes sense thank you.

Everyone say's track gains are very minimal, I felt I picked up alot sotp. It truly "feels"
2x faster off the line. No more 3rd gear lag. Can finally do a burnout without power braking with ease.

Everyone say's track gains are very minimal, I felt I picked up alot sotp. It truly "feels"
2x faster off the line. No more 3rd gear lag. Can finally do a burnout without power braking with ease.

Sounds good.