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ZUKIWORLD Discussion Forum => Technical Discussion - Beginner / Repair => Topic started by: 98redkick on January 13, 2010, 08:23:53 PM

Title: How do I discover the gear ratio on my Sidekick?
Post by: 98redkick on January 13, 2010, 08:23:53 PM: Hi all,

Trying to figure out what the gear ratio is on my 98 Sidekick (1.6, 4speed auto, 4wd, 4 door).

The pumpkin did not have a gear ratio tag on it like the old Danas. It did have some writing on the bottom (...TH or something) but I didn't bother to clean it off as it did not look like #s...

Is there a line setting ticket on the vehicle somewhere?

Thanks for any help in advance..

Dan
Title: Re: How do I discover the gear ratio on my Sidekick?
Post by: wildgoody on January 13, 2010, 08:29:01 PM: I think the 4 speed 4 door autos were 5.125, like the manual
trans 2 doors, I know there is a listing on Zukiworld that has
all the combos of trucks and trannys and gear ratios

Wild
Title: Re: How do I discover the gear ratio on my Sidekick?
Post by: 98redkick on January 13, 2010, 09:23:30 PM: Found it here: http://bbs.zuwharrie.com/content/topic,15579.0.html (http://bbs.zuwharrie.com/content/topic,15579.0.html)

Thanks!
Title: Re: How do I discover the gear ratio on my Sidekick?
Post by: MongooseVRX on September 30, 2011, 04:43:55 AM: I pulled a front axle from a 92 4-door with a 16v and a 5 speed yesterday, and we did the old "hold one cv shaft, turn the pinion, and count the rev's to get the gear ratio". Just over two turns of the pinion was one rev on the cv shaft. I'm confused, it should've taken just over 5 turns to equal a 5.125 r/p ratio right?
Title: Re: How do I discover the gear ratio on my Sidekick?
Post by: Skyhiranger on September 30, 2011, 05:32:28 AM: Quote from: 98redkick on January 13, 2010, 08:23:53 PM
Hi all,

Trying to figure out what the gear ratio is on my 98 Sidekick (1.6, 4speed auto, 4wd, 4 door).

Yours has 5.125 axle gears stock.
Title: Re: How do I discover the gear ratio on my Sidekick?
Post by: Skyhiranger on September 30, 2011, 05:34:30 AM: Quote from: MongooseVRX on September 30, 2011, 04:43:55 AM
I pulled a front axle from a 92 4-door with a 16v and a 5 speed yesterday, and we did the old "hold one cv shaft, turn the pinion, and count the rev's to get the gear ratio". Just over two turns of the pinion was one rev on the cv shaft. I'm confused, it should've taken just over 5 turns to equal a 5.125 r/p ratio right?

Yours will have 5.125 axle gears stock.

Hold one CV shaft, turn the other one exactly 2 revolutions, count the number of turns that the pinion flange turns. That number will be the ratio (so it should turn just a touch over 5 turns, for every 2 turns of the CV shaft).
Title: Re: How do I discover the gear ratio on my Sidekick?
Post by: fordem on September 30, 2011, 05:40:30 AM: Sky just beat me to it - the reason for the "two turns of the CV shaft" is this ...

The final drive ratio is the number of turns of the pinion/number of turns of the axle - but - with an open differential, if you hold one axle and rotate the other - the "differential action" causes the free axle to rotate twice as fast.

If you had a locked differential, you could turn the CV shaft and count the pinion shaft and see the exact ratio, but with an open diff you would need to rotate both CV shafts exactly the same amount to see that happen.
Title: Re: How do I discover the gear ratio on my Sidekick?
Post by: MongooseVRX on September 30, 2011, 07:43:05 AM: Awesome, that makes sense, since the pinion turned just about 2.5 revs times 2 = 5.125. I think I will install the new axle, jack up one side of the truck, mark the tires, and if they turn the same when I spin the driveshaft, it's time for more wheelin'!

Thanks guys!