anybody running a Turbo-350 tranny with the GN 3.42 or 3.73 geared rear-end

[83BLACKHAWK]

I know I am asking alot here, but hopefully somebody is running this kind of combination. I hope this is the right forum for this post. if not moderator please move it to where it should be then, thanks

I was a Mustang guy for the last 7 years and i just switched and I have had this Regal for a month now. So please help me out with the world of gbodies and 8.5" 10 bolt rear-ends.

well I was wanting to know whats your rpms traveling at when going 120mph to 130mph on a 26" tall tire. I am going to run a turbo-350 in my car and my motor i am building is built to rev to only 6500rpm on a normal basis . I really want a 3.73 gear but I want this car to be setup for the 3/8 mile, not just for the 1/4 mile. I am sick and tired of the Toyota Supra's and Neon SRT-4's and most Corvettes griping about there cars are only fast over 100mph and thats why i beat them. and they say you are done at 110mph and I would have come around you blah, blah. (cars i have owned in the past, not this one)

I don't want to go really 150mph plus, (to me thats just stupid on the street) i just want to be able to make it to 135mph, and if i could come close to 150mph if needed, and if i am still ahead of them by then, then they need to stop griping and except defeat. I guess I am trying to find that perfect average for the 1/4mile but still have some left in her to prove a point.(ricers have this thing of roll racing because they can't hook up from a stop and always want to run 30mph-130mph). and they gripe and gripe about it when you beat them, I want to be able to play there game too.

please somebody give me a estimated rpm at 130mph with 3.73 gears 26" tall tire

and the same with a 3.42 gear

I know you are saying i could use one of those calculator formulas, but i don't know what the final drive gear is in a basic Turbo-350. So it would be great if you guys could help me out from your drag strip or street expericences or knowledge of a turbo-350 so i can figure out where i stand

is there a 3.55 gear or some other gear i could get between 3.42 to 3.73 for a 8.5" 10bolt

thanks for your time and replies in advance

 

[unboostedV6]

High gear in a TH350? 1:1

 

[J Banning]

Maybe you'd find more info on a monte carlo board? That trans might be a more popular swap with those guys.

There are some good automotive calculators here:
http://www.tciauto.com/tech_info/calculators.htm

 

[83BLACKHAWK]

thanks, i guess all i really needed was the final drive ratio of a turbo-350, which i got. the rest is just math and picking out how fast i want to go.

 

[84gnguy]

Nice looking ride you got!!

Going 135 MPH with a TH350 and 3.73's isn't gonna work
you will run out rpm way before that
example...I have a car with w/3.31 gears and a TH400 (same 1:1 final drive)
when drag racing,I cross the stripe at 106 MPH around 5,000 rpms with a 26" tall tire.

 

[83BLACKHAWK]

http://www.angelfire.com/fl/procrastination/rear.html

it says at 6500rpm, 3.73 gears, 1:1 trans ratio, and 26" tall tire

i can go 134.791mph.

are these calculators off that bad.

and 84gnguy your figures came out 116.84mph. either the calculator is wrong or i guess your tach is off. I know stock tachs can be off very easily.

doesn't tire pressure come in to play at high speeds at the drag strip, like your tire is not as tall as usual because your running 10psi in them, that should change the rpm some to to mph at the 1/4 line.

anybody else have a opinion on this

 

[84gnguy]

My tach is not off
The calulator's are off..the 116 MPH does not account for torque convertor slippage.

You will not be able to spin a turbo Buick to 6500 rpms either.
If you want to go 130+ MPH get a 2004R and 3.42 gears

 

[83BLACKHAWK]

I will let the cat out of the bag now

my car is going to have a 500hp+sbc, so she will turn 6500rpm+, the turbo or supercharger will come later, you guys may be disappointed but this is what i wanted to do with my car and it makes me happy, but i value the orginal GN cars, and I would never do this to a real one, thats why I bought this stock v6 regal clone of one. since i was a little kid i wanted a GNX styled car and I am obsessed of the sound of a v8 with thumpin cam and flowmasters, so i said screw it and I would have the best of both worlds no matter what people say.

I just know for sure i am going to run the GN rear-end and I need to decide which gear very soon. either 3.42, 3.73, or 3.90

so anyone know a percentage or calculator website out there that accounts for torque converter slippage to determine engine rpm at 130mph with a 3.73 gear and 26" tall tire.

thanks

 

[84gnguy]

The idea of a GNX clone thumping along with a 500 HP SBC sounds good to me! I had a suspicion it wasn't a TB powered car..fine by me!

usually 6-8% slippage is a reasonable number.

 

[83BLACKHAWK]

I hope others on this board will think like you 84gnguy.

anybody else have any opinions

Nate