3spd to 4spd - Transmission Forum

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3spd to 4spd
Thursday, December 15, 2005 8:46 PM
i have a 99 2.2 sunfire with the 3spd auto tranny can i put the 4spd or is there mods?

Re: 3spd to 4spd
Monday, December 19, 2005 2:45 PM
why not swap to a 5-speed?


1997 Pontiac Sunfire
1993 Lexus ES300
1982 Kawasaki KZ550 LTD
Re: 3spd to 4spd
Saturday, December 24, 2005 7:43 PM
the 3t40 in your car isn't controled by the ECM other than the torque converter lockup, where as the 4t60e that is in the J body cars has ECM controlled shift points. So just bolting in a J body 4 speed won't work. However you could use a late 80's early 90's 4t60 from an H body with a J body side cover. These tranys are almost externaly identical to the 4t60e but are not ECM controlled. I would recomend the trans from a 90 88 royal or 98 regency as this is the strongest and most common of the early 4t60's, you could prolly pick one up for around 200 bucks.


85 fiero GT 3800 sc swap in progress
98 Sunfire 4.9 and AWD swap in progress
85 S-10 turbocharged 3800
83 Citation x-11 turbocharged 3.1 with AWD 6000 running gear SOLD
94 Bonneville SLE daily driver
94 Bonneville SSEi wifes pearl pink daily driver
93 Bonneville SSEi I duno why
94 Bonneville SSEi parts for the rest of them

Re: 3spd to 4spd
Saturday, December 24, 2005 8:04 PM
WTF??? The J-cars use a 4T40E.

Mike, find a wrecked car that had the 2.2L with a 4 speed (look at the shifter) and you've got your donor car. You'll need the tranny, the shifter assembly, the PCM, and the engine bay wiring harness... the transmission mounting bracket is the same for all autos (totally different for manual trans).







Re: 3spd to 4spd
Saturday, December 24, 2005 8:24 PM
He's right thats the better way forgot j bodies don't have to have the key, ecm, and bcm kept together.


85 fiero GT 3800 sc swap in progress
98 Sunfire 4.9 and AWD swap in progress
85 S-10 turbocharged 3800
83 Citation x-11 turbocharged 3.1 with AWD 6000 running gear SOLD
94 Bonneville SLE daily driver
94 Bonneville SSEi wifes pearl pink daily driver
93 Bonneville SSEi I duno why
94 Bonneville SSEi parts for the rest of them

Re: 3spd to 4spd
Saturday, December 24, 2005 10:09 PM
No GM car does... you can reprogram them.





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