Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Upgrading to 4 Speed from a T-5 (heh)

Old Nov 30, 2007 | 11:50 PM
  #1  
PV9685's Avatar
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From: Southampton, MA
Car: 89 Firebird Formula
Engine: 305 Vortec, Single-plane, 4 barrel
Transmission: T5, soon 700R4
Axle/Gears: 88 10 Bolt, Disc, Auburn, 3.23
Upgrading to 4 Speed from a T-5 (heh)

Well,

My car is an 89 formula 305 T-5 car, no-rust, beautiful project car. (3.08? I think; LSD rear, 10 bolt w/discs)

So, the T-5 has seen better days, last owner beat it half to death, I think the input shaft is worn, and it has a bad synchro (2nd, ach!)

I am looking to build a 350 for the car eventually (350-400HP), and know that the T-5 will not want the torque I will apply occasionally.

So, it looks like a 4 speed would be the best option, does anyone know what would need to be changed on the vehicle to accept a Richmond T-10 or other 4 speeds (Borg, Munice (M22),).

I know that the crossmember/ torque arm would need to be changed, which I would go with the Spohn setup i suppose. But, I am wondering if the bellhousing and clutch setup would work; along with the position of the shifter hole in the floor/console. I suppose the driveshaft would need modifications aswell.

Then I suppose another issue would be that I have a VSS not a cable

But, I need to find a viable option and a T-56 does not look like as ideal of a situation as a 4 speed.

And this is not quite speculation, I will be doing a transmission changeup this winter, and would like to get the plan in motion within a month. Any help is GREATLY appreciated. And I love suggestions.

-Dave

Last edited by PV9685; Dec 1, 2007 at 12:21 AM.
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Old Dec 1, 2007 | 12:06 AM
  #2  
bingo's Avatar
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From: AL,USA
Car: 1990 Formula
Engine: 95 LT1
Transmission: T56
Axle/Gears: Weak 7.5 with 4.10s
Re: Upgrading to 4 Speed from a T-5 (heh)

Why have you ruled out a T56? It can handle that level of horsepower and provide two overdrives.
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Old Dec 1, 2007 | 12:21 AM
  #3  
PV9685's Avatar
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Joined: Sep 2007
Posts: 172
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From: Southampton, MA
Car: 89 Firebird Formula
Engine: 305 Vortec, Single-plane, 4 barrel
Transmission: T5, soon 700R4
Axle/Gears: 88 10 Bolt, Disc, Auburn, 3.23
Re: Upgrading to 4 Speed from a T-5 (heh)

It does not seem as good on the price/performance ratio. I don't really have a strong need for anything more than 1:1. They are more difficult for me to find, especially at a reasonable price.

I personally do not think that an average working condition manual transmission should sell for more than like $600. Sure, that idea defies logic, seeing that everything has it's price but, for a stock part like a T-56, or a rebuilt T-5, the price should not be very high.

Look at it this way aswell, if I buy a parts car with a T-56, the trans does not make up $1000 of the value of the car like some people are trying to sell them for.

Surely I would not mind a nice 6 speed though. But, I'm not looking to dump huge loads of cash, just loads, hehe.

-Dave
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Old Dec 1, 2007 | 05:52 AM
  #4  
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Re: Upgrading to 4 Speed from a T-5 (heh)

Considering that this topic has been absolutely BEAT TO DEATH on a recurring basis in this forum, what have you learned from all the existing posts on the subject now that you've read a handful of them? Like, the one that's on the second page? Any specific questions that haven't been answered or concerns that haven't already been talked about (which I seriously doubt there could be)?
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Old Dec 1, 2007 | 10:40 PM
  #5  
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Car: 1987 Camaro SC, 1999 Z28
Engine: GMPP 350HO, LS1
Transmission: Built 700r4/EDGE 3200, T56
Axle/Gears: 3.42 Eaton 7.625, 3.42 Zexel Torsen
Re: Upgrading to 4 Speed from a T-5 (heh)

here's your 600 dollars, or not far from it...

http://cgi.ebay.com/ebaymotors/TREME...QQcmdZViewItem
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