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ZUKIWORLD Discussion Forum => Technical Discussion - Performance / Modify => Topic started by: das zuk on October 17, 2011, 12:11:26 AM

Title: Gear ratio question.
Post by: das zuk on October 17, 2011, 12:11:26 AM

I am considering a change in tire size from 31 to 33 inch tires. i have stock pinion and t-case gears right now with the 1.6 vw diesel in it and it does a (c) grade on the highway (i need to draft behind suvs to get up to 65 but when i throw her in 4 low its way to fast to do any good creeping. So my question to whoever this may concern is what would you put as a combination of gears to be a good highway vehicle but can still have game off road? pinion, t-case, or both you oppinion matters. Keep in mind though that it is a diesel. is doesnt rev like the 1.3 or 1.6 tracker engines will. Its done at about 3k rpm. Thanks for reading

Title: Re: Gear ratio question.
Post by: KJMac on October 17, 2011, 09:14:40 AM

What is your rpm at 60 or 65 right now? You could put a turbo on it!

Title: Re: Gear ratio question.
Post by: mrfuelish on October 17, 2011, 09:46:16 AM

What kind of rig do you have?

Title: Re: Gear ratio question.
Post by: das zuk on October 17, 2011, 02:57:35 PM

its an 85 samurai. it is at about 3k rpm at 60 mph. it already has a turbo  ;D

Title: Re: Gear ratio question.
Post by: ack on October 17, 2011, 07:09:00 PM

I would play with various gear/tire/rpm values with this calculator:

http://www.acksfaq.com/gearcalc-01-04-07.php (http://www.acksfaq.com/gearcalc-01-04-07.php)

Start with the optimum operating RPM for your diesel, then add in the tire size and finally start playing with both Diffferential and t-case gear values to get the desired road speed at the desired RPM.

From there, you can play with the ratios - increasing the RPMs for your road speed to improve the low-range gearing response.

I would imagine that, with a diesel, even a good ratio for decent road speed will provide an improved low range response over stock.

Comments?  Diesel owners?  Buhler?

Title: Re: Gear ratio question.
Post by: airmanwilliams on October 18, 2011, 11:36:43 PM

4.16 tcase gears and 4.62 sidekick front diff gears in the axles would do nicely I would think

Title: Re: Gear ratio question.
Post by: das zuk on October 19, 2011, 03:15:20 PM

Do the sidekick pinion gears fit right in the samurai diff?

Title: Re: Gear ratio question.
Post by: airmanwilliams on October 20, 2011, 08:17:54 AM

if you get the ones from the front diffs of the sidekicks they do.

Title: Re: Gear ratio question.
Post by: ack on October 21, 2011, 04:05:18 PM

Quote from: das zuk on October 19, 2011, 03:15:20 PM

Do the sidekick pinion gears fit right in the samurai diff?

Besides them being from the front axle, you will need some sort of spacer (called "cans") to hold the spider gear pins in place...

Spacers are available from many vendors.

...and yes, you CAN bolt a an aluminum TracKick third directly onto a steel Samurai axle... IF the sidegear splines match the Sammy axle shafts.   

Unfortunately, the aluminum housing will shatter like a fortune cookie if you abuse it.    ;D