Quote:
Originally Posted by takid455
The 2.73 & the 1:1 5th are the cruising gear. 1st gear in that trans is a 3.27. Had a 4.10 1st which made a harsh 1-2 shift. 2nd gear was 2.20 ish . The car has been together for 13k miles with the FT HC03 & was pretty happy. I know the gear change will hurt some acceleration, but I'd rather the stronger top end than go to a lower rear. Car is typical 2nd gen w/ no weight saving measures. Doing some work on it & juggling the idea of changing the crank / internals because we can. The SD rods have been resized with ARP bolts connected to SRP forged pistons. Part of me says just go all new for piece of mind. The other part says, save what you can & upgrade the crank. I do like the shorter piston theory as long as it can remain stable. Realistically for the use of this car, either selection will be fine. It'll be street with occasional 6k blast ripping through the turns. That's what the old cam would hit.
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Didn’t realize it was a five speed, i’m always taking Turbo 400 or four speed. Now I understand were your coming from, you seem to have it cover also didn’t realize it’s a motor you already have in the car. Sounds like your pretty happy with the power. So now I understand 273 gear. If you go 4.25 stroke know you realize also need a piston change. The thing you haft to think about is whether or not you want to make a rod change. Because no matter what you do, the SD rods still have stock Pontiac ride journal size. Most if not all 4.25 stroke are BBC size 2.200. Question is, if you make change over to 4.250 stroke is it really going to change anything, I doubt there’d be any notice able gain, but just wanting to update everything because of number of miles on combo. I’m sure you’ve already thought of that. Personally I run 4.250 stroke steel crank with stock Pontiac Rod length, BBC rod Journal, only because of what I do, don’t trust Pontiac stock cast crank. I definitely like stock Pontiac rod length better. Rpm is the killer on cast cranks. My suggestion is to go with a steel crank.