Need info on Tremec rations/ and trans type selection

roadwarrior · #1 (**permalink**) 07-04-2002, 04:30 PM

I know, my bet is that this has been asked more than a few times, but I need some educated person to fill me in on something.

With any luck at all by mid Aug I'll be taking delivery of my new (to me) slighty used SPF and will be seeking engine and trans.

Question. With the rear end ration of 3:73 (I think stock on a SPF) and a 351W at approx 400 HP what final drive would be best? I am looking for some low end to make it fun around town, but also want to be able to hit the hwy and cruise. Ideally 2000-2500 at 70, 75. I am interested in a Tremec 3550, but then perhaps a Tremec is not what I need at all. (open to ideas).

Here is what I think I know:

1. From what I can figure with the 3:73 rear end and a .82 my final drive would be 305, right? (.82 x 373). Would this not be a nice gear for the hwy?

2. Are there different ratios in the 1,2,3,4th gearing between the .68 and the .83. I don't want a large "gap" between 4th and 5th, but I do want a decent 5th for hwy cruising. As indicated above.

3. Also, are there differences between the lower gears on the TKO and the 3550?

Anyone been down this road before? Anyone have a 3:73 rear end with a 351 and any of the above rations that can tell me first hand how they like the set up?