340 4 speed vs 5.2 5 speed
@rumblefish360 it sounds like a great combo ! Woah..nothing less than 4.10 gears..Jesus that will be a screamer !!!
It’s the overdrive that calms it down. The 218@050 could still use a stock converter if you were equipped with an automatic trans. The OD trans has a very deep first gear. The tall tire calms that down. Make it a 10 wide tire for grip. (Probably still won’t have a whole lot of it....)
You’ll need to run down that path to make the 318 seem larger than it is. You’ll come blasting out of the hole and into 2-3-4 like a normal trans and then relax into 5th for a cruise or a run above a 130.
1st gear is short lived. Near useless. But at the track (and if there is ANY traction on the street, LOL!) you’ll use it to make that leap out and bang second gear and stomp it and go!
When you hit the OD gear, it works out mathematically like this:
3.55 X .68 = 2.41. Very very tall for even small cams. Readjust the ratio to:
4.10’s, 4.10 X .68 = 2.78 That’s .02 shorter than the easy to find factory 2.76 ratio. That’s gas mileage right there and with a reasonably small cam, it’s possible.
Let’s do:
4.30’s X .68. It equals 2.92. still Hwy friendly.
3.91 X .68 = 2.66 (2.6588) This may feel a little lethargic on the highway.
Sounds like a great combo!
Thanks!
It did produce good tire smoke in my Duster w/3.21 gears, a 904 and stock sized tires. Ultimately, at the track, it had very bad wheel spin and the best I could muster was high 14’s with a lot of rpm to go. I did the best of 18 mpg’s. And that was traveling on the slow side. I’d loose a single mpg around 65 mph and another one @ 70. I regret not getting down and dirty with the tuning. The car was sold.
