ok, i like to think i know a fair amount cars (maybe im just telling myself that) but one thing i dont understand at all is gearing. will someone please explain to me how this works, and benifits/cons of gearing my tracker. i know its a good idea with lift/bigger tires but i dont know why. but from what i do understand, if i lower my gear ratio i lose top speed right? i know my friend geared his chevy short bed (350) and the rpm's scream on the highway. so i guess what im asking is will gearing it effect my ON road drivability/gas mileage?
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92 geo tracker tin top, bone stock except for decent sound system, a set of hella 500's, and a badly peeling clear coat.
i understand the basics of gears and ratios, i just dont quite understand how it works with cars, i know for example 4:1 would be 4 revolutions of the engine to 1 ???.
as far as what i need, my rig is fine right now, it doesnt need it, but just from what ive heard with lifts and bigger tires, its a good idea to gear it.
as far as lifting and changing th center of gravity, i plan in using 1 1/4" wheel spacers. i know, not as good as reverse style rims, but that should at least help.
but i guess my main question is, when i do lift it, get bigger tires, and decide the gearing does need to be lower (all assuming of course) what is the stock ratio, and what would be a good ratio to gear it too?
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92 geo tracker tin top, bone stock except for decent sound system, a set of hella 500's, and a badly peeling clear coat.
ok what gears are in the axles now? also the tcase is around 2:1. I have 5.125 gears in my axles now and I was running 31" bfg mud terrains but when i got two ltb swampers for the back I could not turn them too much tread that was digging for it to turn the tires enough to do anything so i bought a 4.25:1 tcase reduction kit. now in 4l and trans in drive I go 15 mph at 4000 rpms so I am to low of a gear now. so I would have to go with a higher gear in the axles to get more speed to rpms. So if you go with a mild 31" tire that will work for on/off road use then you should be ok with stock gears but if you have the 4.62 gears in the axles you might be to high for offroad if you get in the mud alot but just trail ride then you should be ok there. so to find out what gears you have we need to know the year make 2dr 4dr auto manual trans stuff like that then we can determine what gears you have. for the most part I have only seen the 4.62 and 5.125 gears but thats in my area and it will depend on where in the world you all. hope this helps
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95 geo tracker (16v)chevy 2.8 v6 coming soon, auto, removable hardtop, dana 30,35 axles custom 3 link front, custom 4 link rear, 33" tsl's, welded rear, smittybilt 8k winch.
motor
man. tranny is 5th gear is 1:1 and OD is 1:0.86 in 5th ( diff od ratios on 2wd !)
xfr case is 1:1 , in 2H and 4H, and
1.81:1 4L so in 4th gear, 2H, the engine spins 1 rev , and same at rear axle pinion.
keep that in mind and all else makes sense. see?
3000 rpm in 4th above is 3000 rpm at rear axle pinion and 5.12 times lower at wheel.
knowing THAT you can calc. distance traveled if you know circumference of tire. Pi x D. = Cir.
distance a second, is found, then times 60 , is distance a minute. ( one must work out miles over inches too)
one can buy 4.24:1 transfer case gears .
the wiki and ever good 4wd web site has gear modelers , that show you how to do it or just pump it in and get an answer.
that's correct, 5.12 turns on pinion , spins wheel 1 time. (crawl under put car in neutral
with both wheels jacked up ,and spin it. and count , 1 potato , 2 potato.
91 4 1.6L TBI 3 speed auto 4.625 2 or 4dr.
91 samurai, 5sp 3.727 (refr)
92-98 4 1.6L MPFI 5 speed man. 5.125
92-98 4 1.6L MPFI 4 speed auto 5.125
94-98 2 1.6L MPFI 5 speed man. 5.125
94-98 2 1.6L MPFI 3 speed auto 4.30
94-98 2 1.6L MPFI 4 speed auto 5.125
96-98 X90 1.6L MPFI auto or man. 4.625
96-98 4 door 1.8l 16V DOHC MPFI manual or auto 5.125
4.30 gears have a 10/43 tooth count
4.625 gears have an 8/37 tooth count
5.125 gears have an 8/41 tooth count
5.375 gears have an 8/43 tooth count
5.625 gears have an 8/45 tooth count
height , besides , coolness bs, helps clearance , but raises center of gravity.
good + bad.
eg not hit front axle, it will break. ( get protectors)
Never quite understood this penchant for lifting. Isn't your clearance determined by the clearance of your axles? I see all these trucks lifted way off the ground, and well beneath them low unprotected axles at 15 inch clearance. Other than visibility (ok, maybe cool, but actually a lowered Tracker looks pretty cool too), what is the point? Clearance governed by height of axle, no?
correct ,but they have the excuse of saving the tranny and transfer case way up in the air. (thick steel plates work best) High CG is never a good thing.
the humvee is what you really need. look under one of them, cool. now that is really cool engineering.
a real humvee. not the GM blazer joke.
Pretty excellent picture, ah, angled axles made of building girders, enormous springs, etc. Hmmm, now let's try to parallel park it at supermarket! Seems like so many try to make wee Tracker into something its not...mini Humvee....I suppose I'm guilty of this too...always wanted an electric winch on front bumper of Tracker. Not because I would ever use it, but think it looks great!
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gearing/gear reduction
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