308 vs 355posi

[morgy83]

Anyone know what difference swapping the 308 out for a 355 posi will make in quarter mile times? 83 short bed with 380hp 355 with 700r trans currently.

 

[436'd skylark]

You'll cut some time off your 60' if you can get it to hook up. 3.55s are not very steep for such a heavy truck either. In a perfect world I don't think you'll have the torque to pull any better than a 1.85-1.80 60'. I'd put in 4.11s especially with the overdrive.

 

[WFO]

The best rear gear for drag racing, is the one that redlines high gear (not OD) at the 1/4 mile mark.

 

[shiftpro]

I'd put in 4.11s especially with the overdrive.

Read this over and over few times!
very good advice...

 

[Rusty Nail]

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