Three speed transmission with split gears? - JeepForum.com
 
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post #1 of 7 Old 12-02-2013, 08:10 PM Thread Starter
Jrmagnum
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Three speed transmission with split gears?

I bought a '71 cj5 last spring and finally got it running. When I was finally able to drive it I was testing out the 4 wheel and couldn't get the front to engage in what I thought was 4 high. After toying with it a little it seemed that when I had the selector foreword the transmission seemed to speed up. I have a third stick on the floor that is working and puts the tranny in low range 4wd. Has anyone ever seen this (or can confirm I have a 6 speed) and if you have do you know where I can find the correct decal (I have the standard two stick pattern sticker)

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post #2 of 7 Old 12-02-2013, 08:29 PM
texasdave
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You have a overdrive transmission. Two shifters the two furthest outside control 4wd the 3rd lever nearest to driver is for overdrive.
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post #3 of 7 Old 12-02-2013, 09:06 PM
texasdave
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It may also be a PTO depending on where the third lever is mounted. If it is close to the trans shifter it is probably an overdrive. One setting further toward the rear of the Jeep would most likely be a PTO. crawl underneath it and see where the different linkages are attached to.
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post #4 of 7 Old 12-02-2013, 10:18 PM
CSP
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It's not really an overdrive transmission. An overdrive has been added to the backside of the transfer case. A '71 would have had a Dana 18 transfer case and the Warn/Saturn overdrive bolted right onto it.

Lots of info about them can be found here: http://hermtheoverdriveguy.com/?page_id=2678
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post #5 of 7 Old 12-02-2013, 10:31 PM
seabass1858
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i have one on my willys and its a god send on the highway keeping in mind that i have relatively stock sized tires so the engine doesnt struggle in OD. drove it 2.5 years daily like that as it was my first vehicle in highschool.
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post #6 of 7 Old 12-03-2013, 05:26 AM
jeepdaddy2000
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The Buick came stock with a T14 three speed or an optional T98 four speed, with a single lever D18 transfercase. The shift pattern is (from front to rear) 2H 4H N 4L.
Any other sticks (in the stock configuration) would be behind the t case shifter and belong to either an overdrive (usually mounted behind the t case shifter) or a PTO (usually mounted behind the transmission shifter and between the seats).
Pictures are worth a thousand words. Feel free to post what you have.
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post #7 of 7 Old 12-03-2013, 12:20 PM
80cj
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I had a Warn overdrive in my 64 CJ-6 with T-90 trans, D18 TC, 5.38 gears and Chevy V-8. As seabass1858 said, that overdrive was a Godsend for highway driving. It effectively made the final drive ratio 4.04:1. It served great as a gear splitter both on and off road, even in low range. Just be aware that the gears are somewhat small so burnouts, etc., should be avoided.
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