Swapping to 4r70w. Needing help

Is this a dedicated strip car? Do you need a functional speedometer? What MY did the 4R70W come from?

I did not see a new automatic PCM on the list. How are you planning on shifting the automatic transmission (the manual PCM lacks the ability to control the automatic).

You are going to fry the O/D Band really quick running 4.30 gears because you will not make it to the end of the 1/4 without having to shift into O/D, WOT into O/D= bad !

ran260gt said:

You are going to fry the O/D Band really quick running 4.30 gears because you will not make it to the end of the 1/4 without having to shift into O/D, WOT into O/D= bad !

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When I read this post, I was thinking that the combination of high stall speed torque converter AND the very low 4.30 rear end gear would not make a good combination. Adding to this is a MAJOR NOX hit......

It would seam to me that wheel spin off the line could be a problem and having enough gear to make it down the track. However, I am not a drag racer and do not consider myself an expert. But with the extra torque provided by the NOX hit, wouldn't it be better to use a gear that make it to the end of the track? The ultra low gear is meant to offset poor low end torque. The combination of high stall speed conveter and NOX should give the torque off the line.

Not to mention that 4.30's will destroy the highway gas mileage and the increased engine RPM's on a long drive.....

If this car were a track only car, IMO you could get by with just a transmission cooler. As a street/strip car, consider using the correct radiator. The radiator cooler does more than "cool" the transmission fluid. It also "warms" the fluid when it is cold. This improves cold/warm performance.

Also, most trans coolers are designed as supplemental coolers. A dedicated trans cooler would have to be much larger. During cold/cool weather, I could see a real possibility that a very large trans cooler would cool so well that the transmission would NEVER warm up. Then some sort of temperature control device (t-stat) would be needed.