*FAQ*What tcase gears should I (or you) buy? - Page 2 - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-09-2019, 09:22 PM   #26 (permalink)
ZUK Herder
 
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Join Date: Mar 2004
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Location: Live free or die
Posts: 4,487
Basic description of rig: Some tube tube and rust

Engine: 1.6 8v with 1.3 EFI, header 2" exhaust

Transmission: 1.6 tracker 5 speed

Transfer case(s): kicker 3 ( side kick doubler (stock gears) to samurai 5.14

R&P: toy 4:30

tire size: 39.5

Type of wheelin you do: rock and new england muck

How you like it on the highway: not in years trail rig

How you like it offroad: works good

If you had to do it again whats gears would you buy: will bee adding auto soon
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Old 02-09-2019, 09:40 PM   #27 (permalink)
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You do realise it's mechanically impossible for transfer gears to change the speedo reading, right? As I said, if changing transfer gears changed the speedo reading, then so would every gear change in the manual transmission.

Don't just assert what you saw on your vehicle, You haven't proved anything. Prove me wrong mechanically. The speedo drive is pressed onto the output shaft of the transfer and so is locked to tailshaft speed. Just think about that carefully when scripting your response.
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Old 02-11-2019, 04:53 AM   #28 (permalink)
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Quote:
Originally Posted by Gwagensteve View Post
You're missing that the speedo drive can't see what's happen upstream of it, only downstream. For your example to be correct, the speedo would read differently in each gear.

The speedo is calibrated for rear end ratio and tire diameter. If you put reduction gears in the transfer case, the engine revs to achieve the same transfer output speed increase. If the car was running stock tyres and axle ratio, the speedo would still read correctly, the engine just has to rev higher to make the output shaft of the transfer spin at the same speed it did before.

If I change gear from 5th to 4th, revs jump up at the same output shaft speed, just like fitting transfer reduction gears, the speedo has no idea this has happened either.

So say now I put 31" tires on. These are bigger so for the same transfer output speed, the car travels 16% faster. The speed reads 50 MPH but the car is doing 58mph. I can gear the transfer case however I like, or put the car in whatever gear, when the speedo is reading 50MPH, the car is still actually going 58.

Transfer gears correct gearing with bigger tires - they do this by increasing engine speed at a given road speed, but the speedo can't see this. The speedo still thinks the car has 26" tires on it and a 3.7 rear end. Changing the axle ratio will effect the speedo reading, as will changing tyre size. They're the only two things that can change it.
This has been good fuel for thought and in thinking this thru, I see what you are saying. If Speedo sensor is on the RPM of the output shaft of the TC or the driveshaft, that RPM would be "hard coded" per say to the rear end ratio and tire diameter no matter what happens upstream as you said. So now I really don't understand why my speedo is +-1 MPH when compared to my GPS with 33" tires. One thing I've never checked is speed when in low range. I guess most of the time I'm in low range, I'm going so slow, it really doesn't even register.
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Last edited by Zuk-E; 02-11-2019 at 04:54 AM.
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Old 02-11-2019, 01:07 PM   #29 (permalink)
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4.88 R&P would correct the speedo with 33 tires. Can you give me an RPM at a GPS confirmed speed in 4th or 5th gear?
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Old 02-14-2019, 02:51 PM   #30 (permalink)
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Basic description of rig: 1972 Jeep CJ5

Engine: 2.3L Suzuki Aerio

Transmission: Samurai 5 speed

Transfer case(s): Samurai 6.5:1

R&P: 5.13

tire size: 34" swampers to 37" MTR's

Type of wheelin you do: PNW trails, snow

How you like it on the highway: too low geared, 55 mph is comfortable

How you like it offroad: good, but could be better

If you had to do it again whats gears would you buy: i'd do a vitara/tracker hydraulic 5 speed w/ tracker/vitara rangebox and 4.7 geared toyota case doubler - a gear for every scenario. I was either too low or too high w/ single sami case
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Last edited by 86chevyjoe; 02-14-2019 at 02:51 PM.
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