9" or 12 bolt? t-56 and rear end gears what is best? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-13-2002, 10:55 PM
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Post 9" or 12 bolt? t-56 and rear end gears what is best?

I was just wondering if I should use a 9" or 12 bolt in my 85 camaro.. both need to be adapted I was just wondering which one you guys think is best.

Also I heard t-56s don't have as low of a 1st gear as the t-5.... so if I wanted to keep a low 1st gear and have decent milage on the highway would I want to go 4.11 or 4.10 or should I go down to like a 3.73? I was thinking that the 3.73s wouldn't allow me to take off too well and the 4.10 or 4.11 would be alright because I would have 6 gears to go through before my rpm would start to climb too high on the highway

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Old 11-14-2002, 08:57 AM
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Give me 24 hours to get to my other computer and I'll run the numbers for you.
If you want, post as much information about the car that you can and I'll run all of the data and give a full performance report.
Will need Specs on the engine, horsepower and torque if known.

Redline of engine.
Torque converter information
Complete tire size and type.
Weight of car with driver
Specifics on body
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Old 11-14-2002, 02:57 PM
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umm right now it has a 305 with like 160 hp and 120ft/lbs tourque (guesstamate) and it redlines at 7000 rpm.....

I am planning on putting in a 400 with about 250-300hp No idea what it will have for tourque and I figure it will redline anywhere from 4500 to 5500 rpm

If anyone else wants to give better specs for a 85 ish 305 (not sure engine is origional in car since it is missing a bunch of electrical crap) or what a 400 with a good cam and 10.5:1 compression with stock heads and opened up vavles please do so...
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Old 11-20-2002, 08:36 AM
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Late style:
1st = 2.66
2nd = 1.78
3rd = 1.30
4th = 1.00
5th = 0.74
6th = 0.50
rev = 2.90
Early style (not as strong)
1st = 2.97
2nd = 1.94
3rd = 1.35
4th = 1.00
5th = 0.84
6th = 0.62
rev = 3.38
The most popular gear is the 4.10 or 4.11
however alot of people are starting to run 4.56 & deeper gears ... remember this: .5:1 high gear makes a 6.14 rear gear be the same as a 3.08 was in the 'old days' of direct drive 1:1 transmissions & also think about this: w/ 27" tall tires & 4.56 rear gears the late style (the only one to use) with the .5:1 6th gear @ 7000rpm would give you a top speed of 246mph if you could 'pull it out (Y-Rated tires are only rated safe up to 186mph) & your 70mph rpm would only be 1984rpm ... you might want to consider what rpm you want to 'cruise' at & what rpm range your engine is built for ... 6.14's in theory would give you a top speed of 183.42mph @ 7000rpm & 2671rpm @ 70mph w/ 27" tall tires (discounting tire growth)
Later!
Wild Bill / T56SS
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Old 11-20-2002, 07:18 PM
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Alright well thanks alot... I think i will be going 4:10 4:11 or 4:56s depending on the tire size I go with (probably 25 or 26 inch) and depending on what tranny I can find (would like the stronger one but I may not be able to find one)

Damn that sounds so good.. My friends were trying to talk me into 4 speed or an automtaic... I am liking the idea of being able to pull off having nice low gears and still be able to cruise on the highway with about the same milage as if I were to keep my 5 speed with the crappy gears I have now
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Old 11-21-2002, 06:17 AM
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I am pretty sure the "new style" is '94 thru '97 F-Body donor-cars & they had LT-1 engines --- they also used a "really different" type of clutch set-up --- they used a "pull type" throw-out bearing --- I only have LT-1 experience and am not sure what kind of parts it takes to use the T56 behind the pre-metric motors --- I know it is done & I know they kick butt --- If you can't find help on the details for your conversion just let me know & I'll try to help you get answers you need! You will want the new style because the old style is only good for about 350 foot-pounds of torque & as I recall the new is rated at 450 (same one as used behind the Viper ...)
Hope you can figure this out ... Guess I need to work on how to make this computer show what I see on the screen when I post it ... what all these numbers & stuff is suposed to say is ... shifter position ... transmission internal ratio ... effective over-all ratio w/ 4.56 gears ... ground speed @ 7,000RPM w/ 25" tall tires & RPM @ 70MPH

1st 2.66 12.13 42.92 Blown
2nd 1.78 8.12 64.14 Up
3rd 1.30 5.93 87.82 5579
4th 1.00 4.56 114.17 4292
5th 0.74 3.37 154.29 3176
6th 0.50 2.28 228.34 2146
Reverse 2.90 13.22 39.37 No Way

Have fun and don't forget to make it stop good too!
Later!
Wild Bill / T56SS
P.S.
I'm an old Ford-Man & you can't beat the 9"

<img src="graemlins/mwink.gif" border="0" alt="[mwink]" />

[ November 21, 2002: Message edited by: T56SS ]</p>
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Old 11-21-2002, 06:33 AM
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Well there is quite a bit of information... I have an 85 camaro... I hear my clutch cylinder fits.. thing is I don't know what I would need for clutch fork and flywheel or do I even need a different one?
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