ArnZ Posted August 19, 2007 Share Posted August 19, 2007 I supposedly inherited a 5 speed close ratio tranny with a parts car purchase. Anybody know how to idenify? I know the color of the speedo cogs tell something, or do they? Quote Link to comment Share on other sites More sharing options...
2126 Posted August 20, 2007 Share Posted August 20, 2007 The speedO gear color will indicate what diffy gear it was mated with however, the only way I know to I.D. a close ratio unit is to check the tranny p/n and cross reference it against the models that came with the close ratio tranny....280ZX 1983, 1984, & 1985!!!? Sorry I couldn't be of further assistance! Tom Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 20, 2007 Share Posted August 20, 2007 What do you mean by "close ratio"? Do you mean a Nissan Comp transmission, or a 280 ZX transmission? I think zhome.com has a series of pictures which can help you discern which one you have... Quote Link to comment Share on other sites More sharing options...
ArnZ Posted August 20, 2007 Author Share Posted August 20, 2007 I bought a 75 280Z with two extra transmissions. One is supposedly a "Close Ratio"? I really didn't think much of it at the time, but thought I would research a little to find out what it is. I also got a (supposedly) Q45 LSD or VLSD. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 20, 2007 Share Posted August 20, 2007 I'd check the zhome.com information first and see if you can figure it out. If you can't the other way to do it is to put the trans in a gear and mark the input and output shafts, and then spin the input until the output makes one revolution. Count the number of revolutions for the input, and that would tell you the gear ratio. You can then use a chart like the one on this page: http://www.geocities.com/z_design_studio/ to figure out which one you have. You can check more than one gear if you're not sure. If you do have a Nissan Comp transmission they're worth some $$$ these days, so definitely check it out. Quote Link to comment Share on other sites More sharing options...
DHale_510 Posted August 20, 2007 Share Posted August 20, 2007 The later Comp transmissions had the number stamped onto the top in large [maybe 1/2"] stamps. Numbers like N3201 for the "rallye" ratios, N3220 for the super close direct fifth [not bloody likely though!]. Not all got even these indicators. Not all still have the same gears in them. Mostly you have to take them apart to tell, but then since they are race parts, they always need to be taken apart anyway.... Quote Link to comment Share on other sites More sharing options...
WizardBlack Posted August 21, 2007 Share Posted August 21, 2007 I think he is simply referring to the fact that later 5 speeds had a gear or two that were closer than the early 5 speeds. Not exactly a Close Ratio trans per se, but closer than the earlier 5 speed. Mine has the same thing. It is indeed fairly close, but certainly not a race trans or anything. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted August 21, 2007 Share Posted August 21, 2007 If you have the trans, open it and count the teeth. It's easy. Quote Link to comment Share on other sites More sharing options...
ArnZ Posted August 21, 2007 Author Share Posted August 21, 2007 Yea, I doubt this any NISMO tranny. One of the transmissions has NMCA #2 on the side. I don't recall seeing that on any of the others I have. Quote Link to comment Share on other sites More sharing options...
Daeron Posted August 22, 2007 Share Posted August 22, 2007 http://www.geocities.com/inlinestroker/ratio.html jmortensen, thx for the link you posted; it finally helped me prove my own personal observations/calculations from driving my 75 for four years without a functional speedo.. I was spot on!!! Quote Link to comment Share on other sites More sharing options...
z-ya Posted August 22, 2007 Share Posted August 22, 2007 You can also tell by the shifter. The early transmissions have two small nylon bushings with a pin/circlip that hold the shifter in. The later ZX transmissions have much larger bushings, with a spring inside. So with the early transmission, the shifter has a small round hole for the pin, where the later ones have a large square hole for the pin and bushing assembly (and a spring). Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 22, 2007 Share Posted August 22, 2007 You can also tell by the shifter. The early transmissions have two small nylon bushings with a pin/circlip that hold the shifter in. The later ZX transmissions have much larger bushings, with a spring inside. So with the early transmission, the shifter has a small round hole for the pin, where the later ones have a large square hole for the pin and bushing assembly (and a spring). Unless someone like me swapped the shifters... Quote Link to comment Share on other sites More sharing options...
ArnZ Posted August 22, 2007 Author Share Posted August 22, 2007 That is what I needed, actually printed that entire site a few years ago and forgot about it. Thanks, Arnie Quote Link to comment Share on other sites More sharing options...
z-ya Posted August 22, 2007 Share Posted August 22, 2007 Unless someone like me swapped the shifters... I don't think they are swappable Jon. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 22, 2007 Share Posted August 22, 2007 I don't think they are swappable Jon. Been running a 4 speed truck shifter with the small nylon bushings in mine for 8 years. There was a thread on it a while back about short shifters. Apparently my ghetto version short shifter isn't as short as the Nissan Comp version, but it does work. Quote Link to comment Share on other sites More sharing options...
z-ya Posted August 22, 2007 Share Posted August 22, 2007 Been running a 4 speed truck shifter with the small nylon bushings in mine for 8 years. There was a thread on it a while back about short shifters. Apparently my ghetto version short shifter isn't as short as the Nissan Comp version, but it does work. The later shifter is shorter, and has a better feel. The bushings are also a lot more rugged. You just need to heat it and bend it to contour the same as the older shifter. After doing that, it just pops out of the top of the shift boot. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 22, 2007 Share Posted August 22, 2007 The 4 speed shifter has a longer shaft from the pivot to the ball, and hence a shorter throw. I have an early 70, so I cut it off right above the ball, welded it back on at a 90 degree angle pointing straight back, then bent it up so that it comes straight out the console hole. Then I cut it to the length I wanted and ran a die down it to thread on a stock ball. More info: http://forums.hybridz.org/showthread.php?t=96707 Quote Link to comment Share on other sites More sharing options...
z-ya Posted August 23, 2007 Share Posted August 23, 2007 I just did the heat and bend thing to avoid welding. On another car I did cut and weld. Bending it worked out better because the overall length of the shifter was shorter, giving it a better feel (less sloppy). Quote Link to comment Share on other sites More sharing options...
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