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Old 09-27-2003, 05:02 PM   #1
our64
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Changing to an automatic

I am wanting to change my 63 short box with a 230 cid to a TH350 automatic. I have 307 gears in the rear. Will this be sucked out ( any worse than it is) now with the 3spd standard
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Old 09-28-2003, 03:56 PM   #2
Iron-Butt
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I am running a 250 with a 200r overdrive. I changed the 373 gear to a 5 lug 307 rear end. I am really happy. I can still pull my harley and cruise at highway speeds.
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Old 09-28-2003, 09:53 PM   #3
Demmit_Hemmit's 65
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I'M RUNNING A 350 WITH A MUNCIE M-22 4 SPEED............I HAVE THE 307 REAR END......................NOT A TIRE SCORCHER BUT VERY GOOD TO RUN ON THE HIGHWAY................HEMMIT
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Old 09-28-2003, 10:36 PM   #4
fatboy63k10
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According to the gear ratios below, you would have a 1st gear advantage (lower gear) with the automatic. So to answer the question, the TH350 would be better or "suck" less. The 700r-4 has the lowest 1st gear of the autos.

Turbo 350 1st-2.52 2nd-1.52 3rd-1.00
Saginaw 1st-1.94 2nd-1.68 3rd-1.00
700R-4 1st-3.06 2nd-1.63 3rd-1.00 4th-0.70

Last edited by fatboy63k10; 09-28-2003 at 10:41 PM.
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