Just remember, when you go to a smaller tire, the contact area gets smaller also. Meaning, there is less rubber contacting the ground.
Less/shorter sidewall,all usually means you will get less traction. Or does not work as good as a taller sidewall.
If you do run a OD trans, it's not really a compromise IMO, you get the best of both worlds, one, you can take it on the freeway & cruise & not rev the crap out of it just to keep up w/traffic,better mileage, dont need to install taller tires to take on long trips.
I am thinking if you were to keep up w/traffic on the freeway 65 MPH, you would be turning what 3500- 4000 RPM w/your PG?
W/a 4R OD .68 you could be injoying a quieter drive to the track, most definately get better mileage.
Two, you have a better overall gearing ratio w/a 4R than a PG, plus you can install a trans brake if need be.
Yes, there will be a price difference between the two, but I think w/a OD trans, you can have your cake & eat it to.
Also something to think about, not sure if you are familar w/trans brakes.
If you decide to get a 4100 stall, when you engage a trans brake, the stall will not just stay @ 4100, it will be higher.
I am thinking w/that type of stall (4400-4600 w/trans brake), you are going to be out of your peak torque & would require a bigger camshaft, more duration, & w/that you will need more compression.
It's all just a big money pit, that we all enjoy, for the most part. Just wish we had more $$$$.
I would think you can have your timing come in faster than 3000 RPM, seems a bit late.
There were concerns ( in the Syclone/Typhoon community) about different trans sucking up more power & guys wanting to change out there 700R4 & install a 4L80E.
Also concerns about, a 4L80E being a lot heavier IIRC, about 70 lb weight gain.
A 700 having a 3.06 1st as compared to a 2.48 1st in the 4l80 was also a big concern, overall first gear being taller.
Well guys have been using 4l80e' now for some time & running back to back comparision, there were no difference in ET's or MPH, even though the 4l80E added more weight, taller first gear & the fact that a 4l80e does use more power. So go figure.
Not a great comparision really because these are turbocharged vehicles & the torque they launch @ is like naturally aspirated BB torque teritory & even more.
Turbo cars, like tall gears for the most part..
My Syclone, made 550-560 ft lbs of torque & it is a 100% stock longblock.
MBHD
