72zcar Posted April 29, 2003 Share Posted April 29, 2003 Have been thrashing my 72 v8 z around town a bit shaking the bugs out and I today took it on its first freeway trip... the tranny is a th-350 and i used the msa speedo cable. When at 60 it says 90. hahaha now what I know there is a gear somewhere to replace with a different one, where does it go and how do i know what gear to buy Thanks, bob in ca with (as of today) a registered and insured and running v8 z...hahahahahaha Quote Link to comment Share on other sites More sharing options...
72zcar Posted April 30, 2003 Author Share Posted April 30, 2003 there is one page in the jtr book on this but I still don't get it. I have a th-350 / 3:54 rear end and 225/70/14 tires CAn anyone help me with what driven gear and drive gears to use? thanks, bob Quote Link to comment Share on other sites More sharing options...
Guest greimann Posted April 30, 2003 Share Posted April 30, 2003 Try this link: http://www.tciauto.com/tech_info/speedo_gears.htm Quote Link to comment Share on other sites More sharing options...
Wagz Posted April 30, 2003 Share Posted April 30, 2003 Ahhh. Good post. I needed this information as well. Thanks, Dave! Quote Link to comment Share on other sites More sharing options...
72zcar Posted April 30, 2003 Author Share Posted April 30, 2003 thanks greimann, but I cant get the calculator to work and I not even sure if I am putting in the right information. Surely someone out there has run a th-350 (i know its not the best tranny for cruisin on the freeway, but its what I had laying around and its strong) and can help. Page 11-2 jtr says its the same gears as the t-5 in the chart. so maybe if someone running a t-5 can tell me what driven gear and what drive gear it may help. not sure thanks bob Quote Link to comment Share on other sites More sharing options...
Guest greimann Posted April 30, 2003 Share Posted April 30, 2003 Ok, Need the info: How many teeth are on your drive gear, or what color is it? What is your differential gear ratio? What is the diameter of your rear tires? What is the capital of South Dakota? If you get 3 out of 4 correct, we'll tell you the speedo driven gear tooth count. Quote Link to comment Share on other sites More sharing options...
72zcar Posted April 30, 2003 Author Share Posted April 30, 2003 gear ratio: 3:54 tire hight: 26 inches capital of South Dakota: Pierre ok thats 3 out of 4 Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted April 30, 2003 Share Posted April 30, 2003 Ironically, the most important of the 4 is what color and how many teeth on your drive gear. Note: drive gear, not the driven gear. The driven gear is hopefully the thing you will have to change but you need to know the drive gear to make sure there is a driven gear to match your drive gear and final drive ratio. Yikes, that makes sense to me but sounds confusing Quote Link to comment Share on other sites More sharing options...
72zcar Posted April 30, 2003 Author Share Posted April 30, 2003 acually that makes sense...i think. so I may just have to replace the driven gear ( the gear with the shaft) and not nessarlly the drive gear, but possibly both the driven and the drive gear I am looking at page 11-3 in the bible. I see the retainer, the sleeve, the driven and the drive gear. DO I... remove the retainer pull out the sleeve and then pull out the driven gear? Or am I way off? ANd if I do this is a bunch of tranny fluid going to pour out? should I drain the pan first? thks, bob Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted April 30, 2003 Share Posted April 30, 2003 No. The drive gear is the one on the transmission tailshaft and the driven gear is the one on the end of the speedo cable. The best way to solve your problem is to know what drive and driven gears you have, your final drive ratio and tire diameter and call a tranny shop that is familiar with how to derive speedo gears and let them tell you what you need. Hopefully it is just the driven gear, but it could also be the drive gear or even the driven gear cage. Quote Link to comment Share on other sites More sharing options...
72zcar Posted May 1, 2003 Author Share Posted May 1, 2003 ok thanks scottie Quote Link to comment Share on other sites More sharing options...
Guest greimann Posted May 1, 2003 Share Posted May 1, 2003 From your info, if you have a 7 tooth (pink) drive gear, then you will need a 19 tooth (natural) driven gear, and you might find them in Pierre SD The question is still, what drive gear do you have? Quote Link to comment Share on other sites More sharing options...
72zcar Posted May 1, 2003 Author Share Posted May 1, 2003 Got my plane tickets. they got a special right now... buy a plane ticket get a free 19 tooth sprocket... what was the steve martain joke. "i said socket not sprocket" crap I cant remember. Ok, sunday (my only day off) I will pull the driven gear out and look at it. See what color it is and count the teeth. Before I change the sprockets with my socket I thing I will hit the freeway and bury the speedo all the way to 160...just slam the pucker way past 160 and take a digital pic of it...hahaha should be able to do that at about 100mph Quote Link to comment Share on other sites More sharing options...
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