nfury8 wrote:With a 235/75-15 tire and a 3.55 gear, you should be at about 2900 rpm when going 70 mph.
3.23 gears would drop you to about 2630 rpm.
A .74 OD and 3.55 would change that to about 2140 rpm.
OD and 4.10 would be 2470 rpm. This seems like the best of all worlds.
Good RPM range and the low gear grunt of 4.10's.
OleRed66 wrote: It isn't a bad idea to go with a dakota 5 speed, but why not use a full size tranny. They may be the same, I don't know.
IRISH70 wrote:Note for tuffstuff.....on his trans swap 3-sp to 4-sp behind his 225 slant-6
My 70 318 is set up the same as your vehicle: Lt235/75R15 tires, 3.55 differential......behind a 4 speed. My 4-speed is the OEM new process trans (NP-435) with the granny low. What trans did you use in your 4-speed conversion, the NP-435 or the NP-445, which has a close ratio synchronized shift. You say you cruise around town using 1, 2, 3 and go to 4 (assume like an OD) on the freeway, so I am assuning your trans is a NP-445. Would be interested in a direct exchange via personal e-mail, mine is email@example.com, on the details of your experienced swap.
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