You do realize that a 4 speed will not change the engine speed don't you?   4th gear is 1:1 just like 3rd is 1:1 in the automatic.  You'll have to get a 5 speed to have an overdrive.
BillL


At 08:29 AM 11/2/2005, you wrote:
I was using the stock 3:21..350 with auto..then I had the engine built to around 425 hp and installed a 3:73 so I could drag race every so often..I was thinking of going back to the 3:21 cuz I get tired of hearing the engine whine but now I am thinking of switching to a 4 sp so the gears I have in it will be fine.
 
Ron

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