lowes71 Posted January 22, 2003 Report Share Posted January 22, 2003 I was wondering if the tranny from a '94 Beretta W/3.1 will fit in a '92 Lumina Z34 W/3.4.Both cars have the 4T60E tranny in the.But will the bolt up the same and the gear ratio's be the same or not?I called 2 local dealers and they couldn't tell me yes or no.All they said was the gear ratios might be different.Plus they told me to call a junk yard,So,I did and they told me probably wouldn't fit.Please Help if you can.Because I found A tranny with only 150 miles on it and it still looks new. Thanks, James 1992 Chevy Lumina Z34 Needing a tranny badly!!!!!!!! Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted January 22, 2003 Report Share Posted January 22, 2003 No, the gear ratios will not be correct. The 3100 engine used in the Beretta w/4T60-E had a 3.33 final drive. The 3.4 DOHC uses a 4T60-E with 3.43 final drive. You'd lose a lot of low-end with the Beretta tranny. Quote Link to comment Share on other sites More sharing options...
msvestka Posted January 24, 2003 Report Share Posted January 24, 2003 The internal gear ratios of the transmission are the same, its a different final drive ratio. The difference between 3.43 and 3.33 is only 3%. Your engine will spin slower at a given road speed. I doubt you would ever notice. Using the correct torque converter would have more effect on performance. As for it bolting up, I would imagine the 3.1L / 3.4L are the same bolt pattern since they are near identical engine blocks, but i am not 100% sure. A transmission shop should be able to tell you. Quote Link to comment Share on other sites More sharing options...
patgizz Posted January 24, 2003 Report Share Posted January 24, 2003 the wiring is definitely different, and would need some cutting/splicing. pull the side cover of the trans when you get it to see what of the 4 or so options of wiring it would be. actually only one of the options has all the same sensors and solenoids as the 91-93 dohc trannies. i wouldnt know what to do if it had less or more solenoids, etc... Quote Link to comment Share on other sites More sharing options...
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