Gear ratios?
Thread Starter
Heel & Toe
Joined: Aug 2002
Posts: 23
Likes: 0
Gear ratios?
My current 3.55 rear end is starting to howl quite a bit and I'm looking to replace it with something that would be more suitable for hiway driving (I'm not real keen on 3500 RPMs @ 70 MPH).
Any suggestions as what to go to in order to lower the RPMs some without sacrificing much performance?
Any suggestions as what to go to in order to lower the RPMs some without sacrificing much performance?
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: Gear ratios? (satx79vette)
Do you have automatic or manual tranny? If auto tranny is ok for you then you could switch to 4spd auto with O/D like a 200R4 or 700R4. Get more tQ from the hole plus reduced highway rpms. Best of both worlds. I have 3.90 gear and a 26" dia tire and I rev only 2250@ 65mph with verter locked in 4th gear. 2300rpm@70mph.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Re: Gear ratios? (satx79vette)
IF your gearset is in fact bad, yeh going to what you want is smart...
BUT no gearset change other than 411 to 308 is going to give you the rpm drop worth the money....like an overdrive with decent ratio...say .70 at minimum...
it's just math...your drop from 355 to 308 is allmost meaningless...400 rpm's...
no notice on fuel, noise....hardly worth the bother....
GENE
BUT no gearset change other than 411 to 308 is going to give you the rpm drop worth the money....like an overdrive with decent ratio...say .70 at minimum...
it's just math...your drop from 355 to 308 is allmost meaningless...400 rpm's...
no notice on fuel, noise....hardly worth the bother....
GENE
Drifting
Joined: Mar 2001
Posts: 1,411
Likes: 2
From: St. Louis, Missouri
Re: Gear ratios? (mrvette)
IF your gearset is in fact bad, yeh going to what you want is smart...
BUT no gearset change other than 411 to 308 is going to give you the rpm drop worth the money....like an overdrive with decent ratio...say .70 at minimum...
it's just math...your drop from 355 to 308 is allmost meaningless...400 rpm's...
no notice on fuel, noise....hardly worth the bother....
GENE
BUT no gearset change other than 411 to 308 is going to give you the rpm drop worth the money....like an overdrive with decent ratio...say .70 at minimum...
it's just math...your drop from 355 to 308 is allmost meaningless...400 rpm's...
no notice on fuel, noise....hardly worth the bother....
GENE
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
Re: Gear ratios? (satx79vette)
I'm doing the 200-4R swap, right here in San Antonio! Pretty soon you'll be able to take advantage of some experienced mechanics...as soon as they finish mine!
By the way 3500 rpm @ 70 mph sounds high! Mine does 3200 @ 70 with stock 3.55s. What size tires do you have? Your bio photo looks like 225/60-15s -- put some 255/60-15s on there and you'll drop hundred rpm!
[Modified by page62, 11:33 AM 8/12/2002]
By the way 3500 rpm @ 70 mph sounds high! Mine does 3200 @ 70 with stock 3.55s. What size tires do you have? Your bio photo looks like 225/60-15s -- put some 255/60-15s on there and you'll drop hundred rpm!
[Modified by page62, 11:33 AM 8/12/2002]
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Drifting
Joined: Mar 2001
Posts: 1,411
Likes: 2
From: St. Louis, Missouri
Re: Gear ratios? (satx79vette)
How much would say I would be looking to do something like you suggest in swapping out the tranny?
