The 4R70W is a PCM controlled transmission. The programmed shift points are based upon how long it take the transmission to actually change gears and at what RPM the gear change should be completed. When too low of a gear is used this causes the RPM's to rise faster than stock. The net effect is it still takes the transmission the same amount of time to change gears. However the RPM's have risen more/faster due to the lower gear. For this reason it's sometimes necessary to adjust the shift points so that the gear changes have completed at the same RPM.Why you think it will reduce the life of the transmission?
Thanks for that information. I will run it by my mechanic and see what he thinks. Going to go with 373's I think the 411's are to much for that car and how I am going to drive it.The 4R70W is a PCM controlled transmission. The programmed shift points are based upon how long it take the transmission to actually change gears and at what RPM the gear change should be completed. When too low of a gear is used this causes the RPM's to rise faster than stock. The net effect is it still takes the transmission the same amount of time to change gears. However the RPM's have risen more/faster due to the lower gear. For this reason it's sometimes necessary to adjust the shift points so that the gear changes have completed at the same RPM.
Also look up "critical speeds" with how it relates to U joints.
I'd go with the 4:10 gear. You shouldnt be worried about MPG with a "play" car.2000 V-6 Automatic convertible want to change gear ratio. Has 3:27 with a 7.5 ( I think its a 7.5 have to take a look) running 17 inch tires. Wanted to go with Yucon 3:73 but a mechanic recommended 4:11 any opinions. Not a daily driver just for fun and shows. Not sure what it will do to my MPG, but should give me more speed out of the gate.
Thanks
I’m still wondering how your car with LSD is doing. Did the psychedelic paint job turn out like a flip paint or a 60’s VW bus?my .02 here...... Before you do this, look into what it will cost you to swap to the 8.8 rear with LSD. In my case I have a 95 vert with a 5 speed. Came with 2.73:1 in a 7.5. I found an 2004 gt 8.8 which had 3.27:1 inside with LSD for $250
You have reactivated a Zombie thread.I'd go with the 4:10 gear. You shouldnt be worried about MPG with a "play" car.
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