91b22 Posted January 11, 2013 Report Share Posted January 11, 2013 located near tacoma, wa. I am looking for a 5 speed trans that i can drop into my 620. not liking this 4 speed at all. would perfer a local pick up, i will meet some where. let me know! thanks in advance guys. Link to comment
datzenmike Posted January 12, 2013 Report Share Posted January 12, 2013 5 speeds are only useful for highway driving and then only to slightly improve mileage. 5 speeds are not faster than 4 speeds and just along for the ride in town. Your '79 has a 4.11 rear end ratio and to offset this higher gearing Nissan used a wide ratio 4 or 5 speed not used in any other year of 620 truck. Most other 5 speeds are a mid or close ratio and this means you may have to rev slightly and slip the clutch a tad more on take offs.... aggravating in stop and go traffic. Fine for a highway commuter vehicle but rough if a work truck carrying a load. If looking for a 5 speed get one from a '79 620 or an '80 2wd 720. Both years have the wide ratio gears, same as the 4 speed but with over drive.. Link to comment
91b22 Posted January 12, 2013 Author Report Share Posted January 12, 2013 I'm not trying to go faster, I hate the close gear ratio and driving at 4k rpm in town in 4th gear. Link to comment
bananahamuck Posted January 12, 2013 Report Share Posted January 12, 2013 Jon posted 5speed was still in it Tumwater over by the airport http://www.pickapartolympia.com/ olympia pap.....nice i think 79 i never checked but powere assisted brakes ....620 ext cab Link to comment
datzenmike Posted January 12, 2013 Report Share Posted January 12, 2013 I'm not trying to go faster, I hate the close gear ratio and driving at 4k rpm in town in 4th gear. 4K in town in 4th is 68.55MPH so very unlikely. It may seem like it's revving way up but it isn't. Of all years of 620 made the '79 has the lowest axle ratio of 4.11. All others are at least 4.375 or higher. 4th gear isn't a gear at all. Power is transmitted straight through the transmission with one turn in, for one turn out. Link to comment
ggzilla Posted January 12, 2013 Report Share Posted January 12, 2013 > I hate the close gear ratio The truck 4-speeds have the widest gearsets. Link to comment
datzenmike Posted January 12, 2013 Report Share Posted January 12, 2013 Very true and the '79 has the widest 5 speed ratios. Transmission Gear Ratios Type 1st 2nd 3rd 4th 5th Year Range MT 4 speed 3.592 2.246 1.415 1.000 1974-79 MT 5 speed 3.321 2.077 1.308 1.000 0.864 1977-78 MT 5 speed 3.592 2.246 1.415 1.000 0.882 1979 Link to comment
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