gears 3.45 or lower??
#1
Member
Thread Starter
gears 3.45 or lower??
so my question is does my car have 3.45's or does it have lower gears in the rear end
at 60mph i am reving about 2100 rpm in 5th
my buddy (vett guy) says that it reving to high to have 3.45's
car is coded to be 88 formula 305 tpi, t5, 9 bolt with 3.45's
maybe somebody changed out gear in the past
i have found other sleeper modification before
just wondering
at 60mph i am reving about 2100 rpm in 5th
my buddy (vett guy) says that it reving to high to have 3.45's
car is coded to be 88 formula 305 tpi, t5, 9 bolt with 3.45's
maybe somebody changed out gear in the past
i have found other sleeper modification before
just wondering
#2
Supreme Member
iTrader: (2)
Join Date: Sep 2006
Location: Houston, TX
Posts: 2,118
Likes: 0
Received 14 Likes
on
11 Posts
Car: 1989 GTA
Engine: SuperRam 350
Transmission: Pro Built S/S TH700R4
Axle/Gears: 3.27
Re: gears 3.45 or lower??
Sounds about right to me. Driving the car at 70 mph in 4th gear (manual) or 3rd gear (auto), the RPM's will tell you your axle ratio.
#3
Member
Re: gears 3.45 or lower??
"If you tach is accurate"
"If you have a .73 5th"
"If your speedo is accurate"
"If you have 25.7" tires"
You probably have 3.7 gears. 64 miles an hour would be 3.4.
"If you have a .73 5th"
"If your speedo is accurate"
"If you have 25.7" tires"
You probably have 3.7 gears. 64 miles an hour would be 3.4.
#4
Supreme Member
iTrader: (1)
Join Date: Sep 2005
Posts: 26,030
Received 1,664 Likes
on
1,262 Posts
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: gears 3.45 or lower??
"If you tach is accurate"
Since they usually fail by reading high, they make all kinds of people think they have gears other than what they actually do. (higher ratio # than reality)
If what gear you have actually matters to you in some way, LOOK AT IT. All of those "calculations", "spin the {fill in the blank} and count", and all that, is nothing but a bunch of GUESSES, which are hardly ever right. I would go so far as to say NEVER, but it's possible that ONCE, sometime somewhere someone somehow accidentally got the right # from some one of them somehow, although I don't think I've ever seen it happen, personally.
Changed your rear end fluid lately? I thought not. Go do that. While you're catching up on the "deferred maintenance" (politically correct term that means "neglect"), make a point of ACTUALLY LOOKING at the gears. Count the teeth. There is NO WAY for there to be any uncertainty in that. And since your next post is likely to be something about "posi", make a point of looking at that too; once again, all the "spin this and look at that" crap usually is WRONG, most usually in the direction of falsely identifying an open as a posi. Don't fall for it, go straight to the source, and avoid all the guessing.
#6
Member
Re: gears 3.45 or lower??
My car spins under 3500 rpm with 3.73 gears in 4th.
#7
Supreme Member
iTrader: (167)
Re: gears 3.45 or lower??
I don't think that is very accurate with stockish height tires.
My car spins under 3500 rpm with 3.73 gears in 4th.
My car spins under 3500 rpm with 3.73 gears in 4th.
It is;
With an ACCURATE TACH,....... If the car is an AUTO then put it into 3rd (1:1) & run it up to 70 MPH and note the Tach. RMP @ 70MPH (700R4) in 3rd = Rear End ratio.
Trending Topics
#8
Member
Re: gears 3.45 or lower??
#9
Senior Member
Join Date: May 2011
Location: Los Angeles, California
Posts: 702
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 Chevrolet Camaro Z28
Engine: 5.7 TPI
Transmission: 700R4 Overdrive Automatic
Axle/Gears: 3.23:1 Positraction
Re: gears 3.45 or lower??
Engine RPM calculator - http://www.csgnetwork.com/multirpmcalc.html
Says 3.45 gears at 60MPH in a 5-Speed trans puts it at 2,174 RPMs with an .80 5th gear
Here's the chart that shows the gears of the T5 - http://www.moderndriveline.com/Techn.../tremec_t5.htm
Says 3.45 gears at 60MPH in a 5-Speed trans puts it at 2,174 RPMs with an .80 5th gear
Here's the chart that shows the gears of the T5 - http://www.moderndriveline.com/Techn.../tremec_t5.htm
Thread
Thread Starter
Forum
Replies
Last Post
ambainb
Camaros for Sale
11
04-25-2016 09:21 PM