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  #11  
Old 02-14-2017, 02:47 PM
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Panteracer Panteracer is offline
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Default Gears

I have a tko 600 5 speed with 411's

gear ratios are 2.87 too low for me... 1.89 1.28 1.1 and .64
the .64 is too far away from the 1.1 4th gear to me
either 3 or 4th can't remember howl like crazy

I am going to change the rear gear to 3.73 but I think first
will still be useless and the gap from 4th to 5 still too much.. maybe the .83
would have been better but they said go .64

Wish I would have keep my old 4 speed as the ratios were perfect
except 1.1 was too low going down the freeway but everything
else was great for crossing, street driving, etc

Just my 2 cents

Bob Benson- Dreamin Ta's 70 firebird
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  #12  
Old 02-14-2017, 11:41 PM
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gnx7 gnx7 is offline
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Here is why you want the T56 Magnum.....

The 2.66 version is basically a close ratio 5th speed (.80 5th) with .63 6th gear. Truly the gearing is primo. I would like a little more overdrive... but oh well.
They hold 1000rwhp in stock from. I'm pushing over 1400hp with my 100% stock unit shifting at 7800rpm in 1-5th gears without ANY issues running a stock slave cylinder and RXT twin disc. 5th gear is holding about 1400hp without issue. This is in a lightweight 2900lbs car though (LS9 turbo RX-7).
It modernizes the car with how smooth they shift once broken in. That alone is worth the cost.
You can change out 5th/6th gear if you want ZR1 gearing or other ratios....
Abundance of replacement parts in stock (older T56's have parts backorder issues)

The TKO600 was designed many moons ago and doesn't shift well at high RPMs.
4th is 1:1 and opting for the .64 5th gear the RPMs fall off a cliff
Shifting smoothness is not even in the same ball park as a T56 Magnum

It is much smaller though and about 50lbs lighter as an attribute.

Gearing will depend upon how much power you plan to make... and redline....
here is a good calculator to play with to figure it all out
http://fitbodyshop.net/gear/index.php
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal
https://lateral-g.net/forums/showthread.php4?t=52976

1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's, 2850lbs
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Last edited by gnx7; 02-14-2017 at 11:46 PM.
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  #13  
Old 02-22-2017, 09:23 PM
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BonzoHansen BonzoHansen is offline
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Quote:
Originally Posted by Ron Fox View Post
Any low lugging rpm's with the 4.11?

What do you think about aT56 with a 4.56 rear gear and a 2.96 tranny gear?
I have a 4th gen LS T56. I used to get a little bit of lugging woth my 3.73s, but now i have 3.90s and its right where it needs to be. Very happy.

4.56x2.96=13.5, you wont get much use out of first gear.
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  #14  
Old 02-23-2017, 01:12 PM
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Quote:
Originally Posted by BonzoHansen View Post
4.56x2.96=13.5, you wont get much use out of first gear.
Add to this that with that type a gear at high speeds you start getting into drive shaft critical speed and risk it coming apart in an impressive manner.
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