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I have a 1973 350 Chevelle with upper end updates that probably puts out 350 plus hp and revs at 3000 rpm at 75mph. I would like to replace trans with an overdrive as I consider the vehicle to be a daily driver. Would I be better off to rebuild the TH350 that is in state of need?
 

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Where is the fluid coming out?

Chances are, if it's the filler tube, the tranny vent is just plugged up. It's on top, just behind the bellhousing.
 

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barfing thm350

you should qualify the leak it may not be a big deal to fix,for example,a cooler line,which is pretty simple to fix,can leak a quart of fluid every 20 seconds.so check it out first.however we do a lot of conversions at my shop,700r4 in place of thm350 and the results are great,yes you do have to shorten the driveshaft,about 3 inchs,and sometimes be a little creative with the crossmember but this trans has a 3.06 to 1 first gear and in 4th gear the input shaft turns 3/4ths the speed of the output shaft,really drops the rpms at cruising speed.your choice,but you might want to find a local shop that does hi perfomance trans to build it for you,in case of a problem you want have to deal with trans back and forth
 
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