How involved is it to install a 6 speed transmission in place of a 5 speed on a 89 IROC with a 305?

Hello all I'm new to the forum.

 

Where are all the experts?

 

That is almost a direct bolt-in for your car.
I've swapped my car from Auto to 6-speed. Since you already have the T5, here is what all you will have to do:

-Use the T56 with the LT1 clutch, flywheel, and bellhousing.
-Use the hydraulic clutch master/slave cylinder from the LT1 car (GM part no 12559912). Just swap it out with your original one.
-Cut the shifter hole back about 2"
-get the custom crossmember from www.spohn.net It's 100bux
-make sure you have the torque arm brackets for the 6-speed.
-if you want the speedometer to work, you will have to order the custom extension housing from www.jagsthatrun.com
it's $300

Good luck!

(edit: welcome to the board )


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89' Iroc-Z
ZZ3 short block-355 TPI ZZ9 cam
NOS 150 shot.
blah...blah...blah..
95' T-56, 6-speed
99' Z' rearend w/ 4.10's
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1997 black Trans AM
LT1, A4, basically stock.
13.87 on the G-tech

[This message has been edited by 89ROC (edited April 09, 2001).]

 

Hey!
I've been toying with the idea of this swap, as I often go on road-trips from Tampa to Atlanta, and the thought of that 6th gear seems nice for the open interstate cruising! Is there any tranny-tunnel clearance problems to be aware of in this swap? Does a custom driveshaft have to be made (I'm not aware of the differences in external dimensions between the two trannys)? Thanks in advance guys!

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'87 IROC Z28
TPI 305
5-speed w/ Centerforce clutch
3 1/2" exhaust w/ Flowmaster
Clarion, Kenwood, Eclipse, Polk, MTX, Autotek 800 watt stereo system
Grant wheel
Otherwise stock, & good for a 14.68 at DeSoto Dragstrip
More to come soon...
Shooting for high 13's with bolt-on's

 

the stock crossmember, tranny mount, torque arm, driveshaft, will all bolt right up, or so i've been told by about 10 people

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86 IROCZ
T-Tops
700R4
305 TPI
3.23 gears
shift kit, manual TC switch, manual fan switch, flowmaster exhaust with edelbrock TES headers& hollow cat, gutted MAF.

 

Thanks roc89. I mainly want to swap to gain the extra torque ability of the six speed.

Frank

 

Did you see the tech article on how to do this?

http://www.skulte.com/T56.html


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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
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