5 speed to 6 speed?
04-08-2001, 07:41 PM
#1
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5 speed to 6 speed?
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.
Hello all I'm new to the forum.
04-09-2001, 02:21 AM
#3
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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 )
------------------
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
------------------
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).]
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
)------------------
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
------------------
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).]
04-09-2001, 07:41 AM
#4
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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!
------------------
'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
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!
------------------
'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
04-09-2001, 02:01 PM
#5
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the stock crossmember, tranny mount, torque arm, driveshaft, will all bolt right up, or so i've been told by about 10 people
------------------
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.
------------------
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.
04-10-2001, 04:52 PM
#7
Did you see the tech article on how to do this?
http://www.skulte.com/T56.html
------------------
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
-=ICON Motorsports=-
http://www.skulte.com/T56.html
------------------
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
-=ICON Motorsports=-
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