Actually disapointment...

In myself, because I have believed that people are honest and they are not always.


The rear in my GTA is supost to be from a 89 5spd GTA with the 3:73.

This is not true, due to the new motor and the countless dallors and hours in the car for it to sit as it does. I have yet to get on the car infact it has bearly been driven.

Honestly I am scared to tear *ss down the road and break something. so I baby it.

Well i get about 2000 miles on the motor and I think...hey, let me give it some gas.

so i go to the track, now I wanted to do 1 run with OD and 1 with out- so I can see and feel the differance.
because the motor is so new, I didnt want to do an actuall hole shot, so i didnt rev it up and actually launch the car.

Racing it was not the reason for me being there. Testing her out with out getting a ticket was....LOL

So I simply staged and peddled it out the hole and down the track.
(slang differ's in area's, so peddle meaning: no break just peddle and not stomped down- just depressed)

Was i disapointed.....WTF.... I can tell you know, that rear aint got 3:73.

Now its myfault cause I believed a person instead of ripping the cover off and checking....

at same time I am hotter the hot....about it.

so since I have posted that I have 3:73 and now I believe different, I need to make a public correction...Cause i am honest.

i believe that the rear has 3:27


so now I will be ordering from summit- so i know what I get is what I want and pay for as well as it being new or atleast good condition....

 

So you still haven't taken the cover off and looked?

 

It’s easy to tell what gears your car has without taking anything apart


1- Chalk the front wheels, take off the emergency brake and Jack up the rear of the car so both rear tires are off the ground. Use jackstands for safety.

2- With the car turned off take the car out of gear and spin one rear wheel by hand. If the other wheel turns the same way you have a posi. (I don’t want to get into a debate about what’s a posi and what’s a limited slip) The point is if both wheels are spinning together move on to step 3

3- Look underneath the car and take note of where the rear Ujoint is facing. Notice that when you spin the wheel the Ujoint spins too.

4- Put the tire air valve at 12:00 o’clock or in other words straight up or TDC and look at the Ujoint again. For beginners put a piece of tape on one spot of the Ujoint and watch it carefully as you slowly turn the wheel in either direction.

5- Count how many times the Ujoint turns over as you turn the wheel. Turn the wheel all the way around one time until the valve stem is back in the 12:00 o’clock position.


If the Ujoint turns about 3 time you have a 3:08. If it turns 3 ¼ times you have a 3:27 and so on.
What you want to see in your case is 3 ¾ turns of the Ujoint .

If you have a non posi then you just jack up one side of the car and spin the rear tire twice around. Count the number of times the Ujoint spins and that’s your gear.

Obviously, if something is broken in the diff (or it's just worn out) then this method won’t work

 

you talk about "3:73" like it a power adder, the car isnt going to be a snail with a 3:27 rear, then turn into a 10 second beast just by swapping the gears to 3:73's. Most people probably wouldnt even notice the difference between a 3;37 rear and a 3;73 rear.

Just take the cover off and count teeth, or use the chalk method, and summit does not sell 9 bolt gears sets AFAIK

 

No I went to the track last night and worked today, to late for me to do tonight.

I want too maybe tomorrow. It should say it on the inside!? to sets of numbers and you divided them into each other....correct?

for example 11;44 is 4:11's right....

either that or I think there is a stamped code to say what it is. Right

 

It is posi,

so I could calk the tires and see, not a bad ideal with out taking the cover off.

Thanks.

and I agree its not a power add...
but I was brought up in the shop and I see the 3:73 as a way to get the power from motor to tire to the ground when you want it.

I always like the feel of 3:73's not that a 3:23 or 3:43 is bad, to me its just more top speed that I will never use anyway....

not like I can do a 150mph around town.

but if our cars were built the same except the rear gears and I had 3:23 and you had 3:73.

the race is different, you get me on the low end and I would get you once i got to 3rd...

or am I wrong to imagin it that way.?

4:11 are to low end for me so I had wanted 3:73 cause 3:23 I thought were to high....

besides....I paided to buy a rear with 3:73 not 3:23....that is the disapointment...

not in the car, I love my car, and I have to say it did well last night under the conditions.

I just dont think the rear has what I was told it had

 

well it wouldnt be the first time somebody lied when selling parts, happens all the time.

 

Let us know how it turns out!!

 

You might be surprised to find out you have 3:73's... Never know... I have always believed that the biggest improvement you can make to a mostly stock drivetrain is to mod your trans. my .02 c

 

for '89, GM built exactly zero GTAs with a 5-speed and a 3.73:1 rear. Those were built with a 3.45:1 gear. That right there should have tipped you off.

 

3:27 are in the rear......



Oh well, want can I really do at this point...other then to just continue to build and build.



Maybe its best any way. Just to purchase new.

So now I will look into getting a gear kit.

thanks everyone for your help.