Modern Motorsports Ltd Posted January 4, 2003 Share Posted January 4, 2003 Welcome Pounds, how do you like to drive and what's your intended uses for the car? You'll be using 1st very little if at all...my father doesn't use 1st in his 240ZLt1T56. He's using a 3.7 LSD. You WILL notice far greater corner control with an LSD IMO and I think some searches on this forum would yield similar feedback. I usually look at a gear ratio spreadsheet I have to see what the mph ranges of the gears are and if the top 'power' gear suits my anticipated top 'power/ie. track or other' speed. 3.9's or 4.11's will have you shifting more often than 3.7's or 3.54's but you'll be shifting either way and traction will already be a large function of driver skill/control so see what suits you intended uses. I can flip you my gear excel sheet if you like. I recall someone has some similar sheets online as well (Bryan's Garage?). Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted January 4, 2003 Share Posted January 4, 2003 IT will depend on your priorities do a search and read these posts Ideal rpms at highway speeds? why you should stay under 7000rpm YOUR engines RED LINE but if I was building the car Id use this calc to match the rpms of the engine to about 2650rpm to 75mph in top gear ( overdrive #2,or .62 ratio), and 7000rpm in the lights at the 1/4 mile in 1:1 ratio) thats about a 4.56 rear gearing BTW and will give you about a 160mph top speed http://www.sallee-chevrolet.com/ChevyTransmissions/gmt56.html http://users.erols.com/srweiss/calcrgr.htm http://users.erols.com/srweiss/calcrpm.htm Quote Link to comment Share on other sites More sharing options...
Mudge Posted January 4, 2003 Share Posted January 4, 2003 T56 is .5 OD in 6th, unless you have a 93 which is .62 Go for alot less gear than 4+ IMO, even with my little engine I'm going with a 3.90 LSD, which for most road courses is actually just about perfect for me. Graph it out, and that should tell you much better than taking wild guesses. www.f-body.org/gears Dont forget to input your corrected tire sizes of course. Quote Link to comment Share on other sites More sharing options...
Poundz9oh9 Posted January 5, 2003 Author Share Posted January 5, 2003 I've got a 420hp(ish) 350 sbc and a T56 lined up for transplant this summer. Which rear-end ratio would you guys recommend for the R200? 4:11 or 3:9. I was hell bent on a lsd setup also but after reading my jtr manual i dunno if I'd even notice the difference. Those are the two options that I've been mulling over. Any input would be appreciated. Thanks in advance.... Quote Link to comment Share on other sites More sharing options...
Poundz9oh9 Posted January 5, 2003 Author Share Posted January 5, 2003 Hey guys, thanks a lot for the links they were really helpful. My main goal with the car is to have a nice weekend cruiser for car shows etc...... but also want to kill some ricers and mustangs (long standing grudge) in a little light to light action, no really hard cornering though. From the calculaters view it looks as though I'll go with 3.9, does that sound about right for what I'm wanting to do? I never really was a math with. Thanks again. Quote Link to comment Share on other sites More sharing options...
Poundz9oh9 Posted January 5, 2003 Author Share Posted January 5, 2003 math wiz, not with! Quote Link to comment Share on other sites More sharing options...
Mudge Posted January 6, 2003 Share Posted January 6, 2003 3.90 is pretty sweet, you could even go with less, but since there are 3.90 LSDs out there I'd look for one. If you go high up into the 4s with the gears you end up shifting way too fast, and those are better for cars with less power. Quote Link to comment Share on other sites More sharing options...
Modern Motorsports Ltd Posted January 6, 2003 Share Posted January 6, 2003 Mudge, from which cars are you aware of donor 3.9 LSD's? Only Japanese offerings have 3.9 LSD's in R200's AFAIK. Here in NA they're all 3.7's in the R200's, unless you have some fine new info for us? Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted January 6, 2003 Share Posted January 6, 2003 i run a 3.7 lsd with a l28 turbo and like the ratio.good cruise on freeway and close ratios on track.unless your v8 has alot of cam you wont want to turn it to fast on freeway anyway if you go on a trip. Quote Link to comment Share on other sites More sharing options...
Mudge Posted January 6, 2003 Share Posted January 6, 2003 Ross, no new find, I guess the one I have was a gear swapped unit then, doh! Quote Link to comment Share on other sites More sharing options...
Guest Luigi Posted January 6, 2003 Share Posted January 6, 2003 What a timely post! I've been wondering the same thing. So can anyone with 4.11's chime in as to how they like that gear? my tires a 225/50/15 ~23" tall. It looks like that you really wind up with a 5 speed. Either 1-5 or 2-6 gears being used. What has/had a 3.9 in it? I have a 3.7 and a 4.11. may as well collect the whole set! All you T-56 owners speak up! luigi Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted January 6, 2003 Share Posted January 6, 2003 your totally correct about that higher ratio gear =quicker car, lower ratio gear= faster car but!!!!! use the calc. below (even with a 4.56 rear gear your only spinning the engine 6200rpm at 160mph with that .62 overdrive top gearing, a 3.73 drops it to 5100rpm at 160mph http://users.erols.com/srweiss/calcrgr.htm http://users.erols.com/srweiss/calcrpm.htm since the cars far more likely to spend most of its time in the 40mph-110mph range the lower gearing makes more sence in a performance car with that overdrive top gearing trans. Quote Link to comment Share on other sites More sharing options...
theBrit Posted January 6, 2003 Share Posted January 6, 2003 I have found car test 2000 to be a whole heap of fun for trying gear ratios and compareing them with other cars Mike Quote Link to comment Share on other sites More sharing options...
Poundz9oh9 Posted January 9, 2003 Author Share Posted January 9, 2003 Ok guys, saw an R200 with 3.55 gearing -- in your oppinions, would that be a decent dif. for the set up I'm looking at ???? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted January 9, 2003 Share Posted January 9, 2003 Pound... with over 400 HP and a 6 speed...a 3.54 diff will shame about every car opposite you at the stoplight on the way to the cruise in. And 3.54 is about what comes in every 280 Z R200 rear differntial and that first gear of the 6 speed tranny will not see much commuter use and neither will that second gear stay engaged long.That high horsepower motor in that light of car will hit 6000 RPM in about 3 blinks of the eye. Quote Link to comment Share on other sites More sharing options...
Poundz9oh9 Posted January 9, 2003 Author Share Posted January 9, 2003 hmmmmmm, good info.....thanks a lot!!!!! Quote Link to comment Share on other sites More sharing options...
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