3t40 to 4t40 swap - Transmission Forum

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3t40 to 4t40 swap
Sunday, January 31, 2010 10:46 PM
Ive looked up mostly everything on autozones website.
Flex plate-same
torque converter-unknown
axles-need 4 speed axles
tranny mount-same

obviously the 3/4 speed tranny have the same bellhousing since they were both in the same engine.
i just need to know what i have to do for the harness? get a whole need engine/tranny harness along with a 4 speed computer?

thanks
steven

Re: 3t40 to 4t40 swap
Thursday, February 11, 2010 3:28 PM
shifter , cables, console and instrument cluster. From a 4t40 sunfire or cavalier but tranny needs to be from 2.2 ohv
Re: 3t40 to 4t40 swap
Thursday, February 11, 2010 4:03 PM
malibu wrote:shifter , cables, console and instrument cluster. From a 4t40 sunfire or cavalier but tranny needs to be from 2.2 ohv. You need the harness for 4t40e it motor and tranny harness
Re: 3t40 to 4t40 swap
Saturday, September 04, 2010 7:31 PM
why the cluster?
Re: 3t40 to 4t40 swap
Sunday, September 05, 2010 12:49 AM
Cluster will depend on the year of your car... and if it has the gear selection lights in it. That would be in the 95-99 range...

But since your profile has not been filled in, we don't know what year car you're talking about



Re: 3t40 to 4t40 swap
Monday, September 06, 2010 12:44 PM
have a 98
Re: 3t40 to 4t40 swap
Thursday, September 16, 2010 6:42 PM
what are the years you can use?
Re: 3t40 to 4t40 swap
Saturday, October 02, 2010 8:33 PM
ive done the swap all u need is the wire harness for the new trans with you motor. comp reflashed for the new trans or get one out of a car with same motor and the 4t40 and u will need the gauge cluster if u want to retain tha gear selector. the cable and shifter in my car are stock for the 3t40 but i now run a 4t40. converter stays locked up if u use the 3 speed flash.
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