4 speed to 4 speed od clutch chatter
I have an O/D in a 70 Dart behind a hopped up 318 and can't stand the 1-2 shift. Just got a standard box for it.
There is one way to stand it; Make second gear in the OD box the same as second gear with the 2.66.
Say you liked second in the std box with 3.55s; then 1.91 x 3.55/1.67=4.06 rear gear.
So then you put a 4.10 back there, and shift at the same roadspeed with the od box as you did with the standard box .
Say you normally outshifted the 2.66low at 2800 at about 24 mph with those 3.55s, so you would be going into second at 24 mph, and you would be revving at 2022.
Now you outshift the od box at the same 24 mph, now at 3740rpm , and drop into second at, get ready for it,2022rpm. Second will take you to 65@5529(27s),with those 4.10s.
Cruising in od will be about 2417.
Cruising 65 with the 3.55s and direct 4th would be 2867rpm.
So, basically, with the od box, you trade away first gear into never-never land, to get 450 less cruising rpm.In the meantime the 2-3 split is pretty far out there too. Bad deal in my thinking.
I never liked it, until I started splitting gears. Cruising 80mph=2000 rpm in double od wasn't too bad.But the powerband requirement of just 1300 or so rpm, was amazing.
The ratios were;3.09-
2.41-1.67-
1.30-1.00-
.78-.54 GVOD in
red
The splits were......78....69....78....77....78....73
Now if you have a stock teener and outshift much earlier, now that is a whole new ballgame! But you'll still sound like a Mustang on the 1-2 shift when you start pushing it.
