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-   -   Trans ratios??? (https://classracer.com/classforum/showthread.php?t=14168)

art leong 11-16-2008 07:56 PM

Trans ratios???
 
I'ts been a long time since I've had any options at all relating to transmission ratios. Back in the late 70's we had the first ever lower gear planetary set for a 727 torqueflite. In our B/SA Hemi Challenger. At the time we didn't see any difference. Didn't change anything else just the planetary gear.
Now I have an oportunity to get a lower first gear 2.84 (now 2.69) second gear is close to the same as I'm running now 1.57 (now 1.55) third is 1 to 1 on both but the lower gear tranny has an overdrive 4th gear 0.88.
Both are automatics.
The final drive ratio on the 4 speed is 4.10 to 1 (now 3.72 to 1)
I figure I can run a taller tire with the 4 speed.
This science is completely new to me.
What is the general thought here?
I'm running a basicilly low torque motor 151 cu inches in a fairly heavy car 2600#

Owen S Quirion 11-18-2008 09:05 AM

Re: Trans ratios???
 
Art, You have a PM


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