Dlabarthe

He'll LS1 Techs. So I've been on the site about a year reading and learning but haven't sought out much til now. I hope I'm using the site correctly. I am building a LQ9 408 Stroker for my 66 Chevelle. It's gonna be pro touring car primarily a street car used on an occasional track. So question is this I have 2 T56's. 1 is out of a 2004 GTO 80k miles and the other I'm told was out of a Camoro i believe around 2000 or 2002 under 100k miles as well. Side by side they look almost identical with the main difgetwnce being at the shifter itself. Here's the numbers. Anyone know how to run them to know exactly what they are?
GTO 13-86-066-904-H / Tag 92155485 J1232
GM 13-86-066-904-H / Tag 61 DXATO11680
No idea what I have really have or wich would be better.
Car will have 525 rwhp I understand the gearing different one longer one shorter?
ANY RECOMMENDATIONS AND WHY? THANKS!!

N20zuki

The GTO is going to be the best bet, The Vette uses a transaxle setup with the transmission mounted in the rear of the vehicle. So there for no bellhousing, different tail shaft and input shaft...

So simply put the GTO trans is the best bet.

Dlabarthe

Ok than I must be wrong maybe out of a camaro because on the ground they look identical, bellhousing and all.

Exidous

iTrader: (11)

The camaro has better gearing in 1-4 for a car that is not a complete tank. Heavier car, go with the gto. Heavier means 3800+ish.

Either way, I'd check them both out internally.

Fbody overall is a better spread. Many will swap the 5-6 setup for a vette one. Makes the double overdrive not so aggressive.

Dlabarthe

Thanks for the info I'm gonna have them both gone through this week or next. I'll sell the one I don't use and want them both right. Thanks again.

Dlabarthe

Sorry for confusion but to confirm you'd go with the GTO if they both check out?

ls1 1990 VN

I have the Camaro Box & 1st-4th gears but swapped out the 5th & 6th for the GTO gears as they are more useable.

Dlabarthe

Did you swap them out yourself or have it done? Wondering how difficult it would be. I'll get some prices on having it done. Thanks

nwilson44

The camaro box has the gear ratios of:

1st-2.66
2nd- 1.78
3rd-1.30
4th-1.00
5th-0.74
6th-0.50

The GTO has a shorter (numerically higher) 1-4 gear. Not sure o the 5th and 6th.

If I was going to make a decision on gearing alone, I'd go with the 4th gen camaro T-56. The Trans is a closer ratio box, meaning the gear spread (first gear minus last gear, or 6th in this case) is closer. This means a longer 1st gear, to allow a better chance for traction from a stop, and a gear spread that doesn't drop the engine RPM's as much between shifts. Both transmissions have 4th gear as 1:1 ratio of direct drive as people call it. This means the input shaft is spinning at the same speed as the output shaft. since the GTO box has a numerically higher first gear it has a larger jump to make from its first gear to its 1:1 gear, so naturally it'll have larger gaps in RPM's between shifts. If the car is heavier than you may need the added torque multiplication from a wider ratio box.

If it were mine, I'd have the ZR1 ratios installed or swap to a TR6060 with those ratios. 2.29 1.61 1.21 1.00 0.84 0.63 not sure on 5th and 6th. That's the closest most performance oriented gear set I've seen from tremec and if you've ever driven or rode in a ZR1 you can tell the engine doesn't fall out of its power band in the upper RPMs ever. Look on YouTube for a WOT video of a ZR1 and note the "space" between gears. The. Go look at a non stalled 4L60E (the stall slips acting like the ratios are closer even though they aren't) those are the two extremes. Even though neither of your transmissions are as bad as the 4L60E, that exercise will demonstrate what I'm talking about.

nwilson44

Just one more note. My buddy had a GTO and when he went into 4th, it felt like/sounded like it dropped the engine on its face, like you shifted into an overdrive. Whereas in my camaro, it's right back in the rpm band ready to rev out again.

Dlabarthe

Great info thanks. I found out the GTO is .84 and .56 for 5th and 6th while the Camaro is .74 and .5 in 5th and 6th. I was considering swapping 5th and 6th If not to expensive but I will look at these suggestions. Thanks alot.

nwilson44

You're welcome. The 5th and 6th on the camaro package is good IMO too. 0.74 is only a 26% reduction in rpm from 4th. With my 3.90 gears it'll top out @ 6500 rpm right under 180 without dropping my engine on its face. But if you go to 6th it will drop it. If you need to go faster than 175 or so then the GTO overdrive is better although they don't differ much. The 03-04 cobras have the less aggressive overdriven gears but that leaves your RPMs up with anything north of a 3.42 or so.

ls1 1990 VN

I had it done.
Here's a short cut to all the ratios. Just scroll down the page & info is all there.
http://en.wikipedia.org/wiki/Borg-Wa...6_transmission

jmd

iTrader: (4)

The ls1 camaro and the gto have identical gear tooth counts on 5-6. They differ in ratio due to headset gear tooth count differences.

Dlabarthe

Everything I've read and heard is to go with the Mcleod RST at 600 HP. I currently have the Monster Level 3 good to 700 HP but seems to be better for the strip than the street. I plan on Putting the monster up for sale and making the change to something softer or more stock like.