Blowncoupe

iTrader: (1)

What gear ratio is in a 99 camaro with a t56 6 speed and a ls1 engine? I'm swapping this engine and trans set up in a 68 camaro and need to know what gears to put in the rear end. Thanks

merim123

iTrader: (11)

HCI2000SS

iTrader: (2)

Stock is 3.42

Blowncoupe

iTrader: (1)

Thanks guys. It has 4.56s right now and I haven't drove it yet so maybe I'll try it before I change them. It came with a new set of 3.73 and a bearing kit that I can put in as a option too. Just want to keep the rpms down when on the highway

AnotherWs6

iTrader: (17)

You've got two overdrives. You'll be fine with the 4.56's on the highway. If they suit your engine combo I'd leave em.

GonHuntin

iTrader: (2)

I swapped a 2002 LS1 and T56 into my '68 camaro and used 4.11 gears......In 6th gear, I'm running right at 2000 rpm at 75mph.

If I had 4.56s, I'd sure try them before I changed gears.

ryeguy2006a

iTrader: (27)

Same as GonHuntin, 4.11 in my 68. I had 3.73 in my 76 T/A that had the LS1/6 speed and it would cruise at around 16-1700 at 75 which was too low for me. That was my reasoning for the 4.11 gears, but I would give the 4.56 a try.

merim123

iTrader: (11)

try the 4.56. don't spend the money. Ratios look decent by gear.

http://www.tremec.com/calculadora.php

1964SS

iTrader: (1)

I'm running a 2002 T56 with 4.11s and a 31" tall tire. I need to be doing at least 75-80mph for 6th gear since it's .5 to 1. 4.56s would work better for me.

Zanie

4.56:1 ? Woot! that will be fun!! leave it !!

hookemdevils22

iTrader: (12)

I have 3.90's, and 80 mph in 6th is ~1800 rpm. Try the 4.56's and drop to a 4.11 if it screams too much, but based on merim's post, you should be fine.

FirstYrLS1Z

iTrader: (4)

I ran 4.56s' for 4 years BUT behind an A4 and that rear end is going back in as soon as the weather gets warmer. I did much travelling with it. I only had a .7 overdrive ratio,2500rpm @ 60mph,3000rpm @ 72mph.

Chicago TDP

iTrader: (3)

I had 4.11 gears in my nova for a while behind my T56. With a 28 inch tire, it was nice for acceleration but I was shifting A LOT. 1st gear is very very short when you have 4.11's in the back. I just got a new for 9 inch and put 3.70's in it to help 1st gear last longer.

My 2 cents

Aston Tibs

iTrader: (3)

I started with 3.73's and 28" tall tire. I could go 80 MPH at about 2000 RPM. Then I switched to 26" tall tires and 4.11 gears and the car feel alot quicker. I am still only about 2200 RPM at 80. I would keep the 4.56 and see how you like it. That thing should jump out of the hole with that setup.

Cheese Weasel

This thread mirrors the debate I had with myself when I bought the 9" - it seemed like whichever direction I went, either 1st gear or 6th gear became all-but-useless. After making a spreadsheet to compare the numbers, I finally chose a 3.70 gear as the best compromise. A significant factor in choosing the 9" was the fact that there's a large selection of available ratios, so if I decide that I need to go deeper or taller with the gear ratio, I should be able to zero in on the ideal match.

You guys who've driven with 4.56 (or similar) gears - didn't that gearset make 1st gear basically pointless??

1964SS

iTrader: (1)

I'm sure that all depends on tire width and height. I'm running 31X16 tire with a 4.11 gear and I would prefer a 4.56 just so I could use 6th more often. It would also depend on which T56 is being used. I have the .5 sixth gear while my buddy has the .63 sixth on his setup.

Cheese Weasel

Oh yeah - I forgot that there are people out there who actually have enough room to utilize some nice meats... (I'm not jealous!!)

Yeah, if someone's able to put some decent-sized tire to the ground, & has a halfway-reasonable suspension to be able to plant the power, by all means, install the deep gears & launch like an F-18 off the USS Enterprise...