HWY GEAR???

[layedoutregal]

I put a 373 gear in my regal with the stock 87 200r4 trans, and over the summer i drove it on the hwy and it seemed to rev high, i didnt have a tach but i could tell it was up there, i have 20in wheels and made the assumption i would be ok, but if i went with say a 342 or a 308 would that give me a better top end? stock i had 276 i think, what would be best

 

[username]

Here is a link to a calculator that might help
http://www.richmondgear.com/streetcalculators.html

 

[megaladon6]

never assume for one. your exhaust could make it sound different. vibrations in the car etc. what size tires do you have? are you sure you're in 4th gear? are you sure you have a 4th gear (200 instead of a 200-4r)
my 3.73 rear and 200-4r run 60mph under well 3k

 

[G-Body_Vet]

If all else fails I'll trade you the rear end from my GP :wink:

 

[megaladon6]

and why are you worried about top end with 20" rims?
have to ask.

 

[dogsht]

A 3.73 gear with a 200-4R has a final drive ratio of 2.49 (just like a 2.49 gear in a 3 speed) so cruising rpm and potential top speed should be great. Normal tire height is 26" but with big rims and low profile tires you often actually have a shorter smaller tire. The calculator linked using the 200-4R's .67 overdrive and a 26" tire shows 70 mph to be 2,261 rpms which is ideal.

On a side note that is with the torque converter lock up working. If its not working overdrive would slip to the tune of about 200 to 300 rpm. (And tax your cooling system much harder)

If you have a plain jane 200-4R ie not from a GN/Ttype/442/MCSS and it has not been upgraded then it WILL NOT shift into overdrive at WOT. In this case your car would be limited to the rpm your engine will push it to. For example overdrive not being engaged an engine that would push 5,000 rpms would only take a car with 3.73s and short 25" tires to 100 mph again according to the calculator linked.

If you have a stock generic 307 then it will likely only push to about 4,200 rpm or about 84 mph 🙁 You can try backing off the throttle at less than your current top speed and seeing if it will shift up into overdrive and if so you can roll back into the throttle and see if you can coax it past your WOT top speed. (at much less rpm) Clear as mud?

Anyway if this is the case there are lots of things you can do with the single best or most ideal being upgrading the transmission with a quality shift kit and parts needed for a WOT up-shift.



Edit; See how those gearing calculators can be used to help you build or put together a better setup for whatever your goals are? BTW even if you only have enough engine to push you to maximum torque and you have a typical lightly modded small block that made maximum torque at 4,000 rpm your gear with a 26" tire would take you to 125 mph and or cruise at 90mph all day.

 

[layedoutregal]

never assume for one. your exhaust could make it sound different. vibrations in the car etc. what size tires do you have? are you sure you're in 4th gear? are you sure you have a 4th gear (200 instead of a 200-4r)
my 3.73 rear and 200-4r run 60mph under well 3k

my tires are 225-35r20s, it was the stock 2004r that came with the regal, i did have a shift kit installed but i think all he did was add a stiffer spring? lucky for me after i had the work done i talked to ppl who says his employees are haters and screw up things on ppls car to make them come back,

 

[layedoutregal]

and why are you worried about top end with 20" rims?
have to ask.

well to be honest the reason is no different then any ones on here, just would like to step on it and let her fly

 

[layedoutregal]

A 3.73 gear with a 200-4R has a final drive ratio of 2.49 (just like a 2.49 gear in a 3 speed) so cruising rpm and potential top speed should be great. Normal tire height is 26" but with big rims and low profile tires you often actually have a shorter smaller tire. The calculator linked using the 200-4R's .67 overdrive and a 26" tire shows 70 mph to be 2,261 rpms which is ideal.

On a side note that is with the torque converter lock up working. If its not working overdrive would slip to the tune of about 200 to 300 rpm. (And tax your cooling system much harder)

If you have a plain jane 200-4R ie not from a GN/Ttype/442/MCSS and it has not been upgraded then it WILL NOT shift into overdrive at WOT. In this case your car would be limited to the rpm your engine will push it to. For example overdrive not being engaged an engine that would push 5,000 rpms would only take a car with 3.73s and short 25" tires to 100 mph again according to the calculator linked.

If you have a stock generic 307 then it will likely only push to about 4,200 rpm or about 84 mph 🙁 You can try backing off the throttle at less than your current top speed and seeing if it will shift up into overdrive and if so you can roll back into the throttle and see if you can coax it past your WOT top speed. (at much less rpm) Clear as mud?

Anyway if this is the case there are lots of things you can do with the single best or most ideal being upgrading the transmission with a quality shift kit and parts needed for a WOT up-shift.



Edit; See how those gearing calculators can be used to help you build or put together a better setup for whatever your goals are? BTW even if you only have enough engine to push you to maximum torque and you have a typical lightly modded small block that made maximum torque at 4,000 rpm your gear with a 26" tire would take you to 125 mph and or cruise at 90mph all day.

thanks bro u really helped me out...all u guys have