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Old 02-07-2011, 05:36 PM   #1
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5 speed vs 6 speed manual trans.

Why did Jeep change their manual transmissions from 5 speed to 6 speed? I noticed this for the Wranglers.. I'm not sure why a Jeep would even need to be 6 speed. Just something I've been wondering..

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Old 02-07-2011, 05:45 PM   #2
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with something that is designed for offroad use, having a transmission with more ratios allows the use of a low crawler first gear, while still having an over drive gear for the high way runs, and to keep a few gears in between.
back in the day, my grandfather used to talk about how in the 60s, they all thought no one would ever need more then a 3 speed. now 5 and 6 speeds are the common, with a few manufactures having 8 speeds. the more ratios give the vehicle greater flexibility to better deal with more situations.

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Old 02-07-2011, 05:54 PM   #3
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My '75 CJ5 had a 3 speed manual and did just fine. IMO 6 speed is not necessary. More gears to pack into the same space, and the newest 6 speed (NSG370) is having problems popping out of gear. Offroading isn't brain surgery.
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Old 02-07-2011, 09:31 PM   #4
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schnutzy Here is a question for you . Do you know what a brownie box is . Grand dad was not that old ??
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Old 02-07-2011, 10:57 PM   #5
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Quote:
Originally Posted by BANGER View Post
schnutzy Here is a question for you . Do you know what a brownie box is . Grand dad was not that old ??
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not quite sure what your asking here. but my grand dad was in his 40s during the 60s
i guess it would have helped if i mentioned that the 3 speed he was talking about was the THM350 is his 69 buick
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Old 02-07-2011, 11:03 PM   #6
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My '75 CJ5 had a 3 speed manual and did just fine. IMO 6 speed is not necessary. More gears to pack into the same space, and the newest 6 speed (NSG370) is having problems popping out of gear. Offroading isn't brain surgery.
i love my 6 speed! not sure if mine is the one you were talking about or not..ive never had a prob with mine poppin out of 1st gear
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Old 02-08-2011, 07:19 AM   #7
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What I,m asking is have you ever heard of a brownie Box .

In the late 50,s the 3 speed was not doing the job for some people . So at that time you could buy a 2/3 speed box that you mounted behind the Trans giving you 2 or 3 more gears like an over drive . Alot of over the road trucks would have this extra gear box . We as kids put them in pickup trucks so we could go faster .

They were a real pain and did,t work very well (lots of Vib,s) and we did,t have the Power to use them very well . But you could get an old truck with a top speed of maybe 60 up to 80 mph
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Old 02-08-2011, 07:26 AM   #8
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i love my 6 speed! not sure if mine is the one you were talking about or not..ive never had a prob with mine poppin out of 1st gear
It's not all that common. Of course it seems that way when everyone posts about it here, but in reality the percentage of affected owners seems to be very small. It hasn't ever happened to me, either.
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Old 02-08-2011, 11:04 AM   #9
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I rarely use first on the street...so effectively I have a well geared 5 speed, with a low crawler gear available PLUS 4-lo.

I could make the case that a Jeep needs more gears than any normal automobile. Its got a very weak engine with terrible aerodynamics...it needs the engine in its powerband at all times to keep up with traffic. Going offroad, having a very very low gear available can be extremely useful. So couple the two together and you get a very low first gear, and a close-ratio transmission the rest of the way up to keep RPMs where they need to be.

If you want to talk about unnecessary gears - my bike has 6 and only needs 1st to do the legal speed limit on any road in the US.
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Old 02-08-2011, 11:27 AM   #10
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I think the extra gears have been added for EPA fuel economy numbers. As Bubba68 says, on several vehicles, 5th and 6th are superfluous from a performance standpoint. Kawasaki ZX-11, Corvette ZO6, many others really use only first 3 gears with fourth for freeway, and still have 2 more gears on top, I think just so they can satisfy better EPA fuel economy sticker numbers. And I know Wranglers still don't get very good fuel mileage, but so be it. I use 5th occasionally, and almost never use 6th. Oh, well.
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Old 02-08-2011, 01:06 PM   #11
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with a 6 speed, you can have a low 1st gear for the thick stuff and a super tall 6th for highway cruising and mileage. PLUS, you don't get a big drop in rpm between gears. you also get more usable real world options for axle ratios as an added benefit.
my 05 gto had a 6 speed. 5th gear was the average 2 lane highway cruising at 50 gear, 6th was great for interstates. 4th on the freeway would have KILLED mileage and been revving too high. cars like my gto and the vette have plenty of low end power so you can lug it along in 6th at 1500rpm and it's not a problem. my 11 second 95 mustang was dying for a 6th gear with just a 3.73 axle ratio. there's a reason performance cars use 6 speed more often than not now, they're just more versatile.
try using 6th in your wrangler. if i can get 22mpg highway (calculated by me, not the on board computer) with an auto, you should be able to do better in a manual.
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Old 02-08-2011, 03:40 PM   #12
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lol, agree, i think my firdt gear on my bike will go 80mph...lol
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Old 06-23-2011, 09:08 PM   #13
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schnutzy Here is a question for you . Do you know what a brownie box is . Grand dad was not that old ??
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I remember a brownie. Back in the prehistoric days Heavy duty trucks has a 5 Speed Main Transmission and a 3 speed brownie. 5x3 + 15 gears. Of course it was a sign of a real pro if one could do proper shifting. took two hands....

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