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So I have a 68 coupe, with a 93 302 bored .30 over, with 289 Hipo heads and a C4 tranny. Currently I have the stock 2:79 8" rear, and want to upgrade to 3.55's. The car runs great, and has a little bit of balls. But I also have a stock torque converter. So if I upgrade the rear gears will I notice a big difference in the getty up? Or do I need to change out the torque converter to? What is stall? It is just a weekend cruiser that I like to get crazy with in straightaways. Thanks for any input.
 

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You don't need to change anything else. Just the gears should give you more get up and go, it just won't be quite as fast on the LONG straights.
 

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Yep, the biggest bang for your bucks is the gears. Go with 3.5x:1 and you will have a hard time getting the smile off your face.
 

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The "stall" on a torque converter is the rpm's it takes for your car to move. i.e. if you have a 2000 stall your car starts moving at 2000 rpm's. Changing gears without changing the torque converter will be great for you, and street driving. A higher stall allows you to have higher rpm's at launch helping your car get faster in a shorter distance. Needing a higher stall has usually goes with your engine setup more than the gears you run.
 

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Discussion Starter #5
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Ok I get it thanks guys. The tranny shop I went to was saying I needed a bigger converter because of the e303 cam I had, and I wanted to know if they were speaking truth or not.
 

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Race cars use high stall convertors to get the RPM'S up for when the Go Light turns green. You will see a GM car have High stall convertors because Most GM's engines are short stroke and don't develop their max torque in the low range

Lot's of Ford engines are a longer stroke and have much higher numbers in the LOW Rpm Torque.

You will be fine with the one you have but will increase fuel costs
 

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I had a set of 3:50 gears in my '68 with a c-4 and 302. The car really woke up when I did the pumpkin swap.

Now, after 20 years, I decided to replace the 3rd member again with a 2:79 pumpkin . I put the 3:50 geared 3rd member in another car which will have a manual 5 speed.

Freeway speeds with the c-4 ,3:50 rear end ratio, and three chamber droning flowmasters got old and annoying. Be prepared for a boost in RPMs while cruising and be sure to use mufflers that don't drone. :so
 

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o.k., with the E cam a little better converter will help. try the gears first, and if you do want a little more getty up get a 2200-2600 hundred converter. oh, and by the way that does NOT mean it has to get to 2200-2600 rpm to move! :bigthumbsup
 
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