Calgary Jeep Association

4x4 Related Groups => Tech Talk => Topic started by: fraserr7 on November 22, 2010, 04:44:45 PM

Title: TJ 4 hi top speed
Post by: fraserr7 on November 22, 2010, 04:44:45 PM
Is there a limit to how fast I can go in 4 hi? I have a stock TJ 4 banger 5 speed...
Title: Re: TJ 4 hi top speed
Post by: Spinalguy on November 22, 2010, 04:51:17 PM
i had the same jeep. i ran it often from Banff to Lake Louise in 4hi. i had no problem doing 120.
What i did do...once, that you should not do is put it in 4hi at speeds above 80. It did not gernade the t case but i did get a new sound from it that seemed unhealthy. ;)
Title: Re: TJ 4 hi top speed
Post by: FiEND on November 22, 2010, 04:59:42 PM
doubt there would be a limit?  all the same parts are moving whether "most" people are in 4wheel drive or not.

if you are in a position where you do not need 4 wheel drive, but still use it, then most likely parts will be stressed more and wear out or break faster, or in relation to speed.

if you are in a position where you do need 4 wheel drive, then you should be more worried about killing people than wearing out parts.
Title: Re: TJ 4 hi top speed
Post by: vantagetes on November 22, 2010, 05:03:24 PM
if you are in a position where you do need 4 wheel drive, then you should be more worried about killing people than wearing out parts.
Title: Re: TJ 4 hi top speed
Post by: WhiteOut on November 22, 2010, 05:05:41 PM
Where are all these people getting told "Not to exceed x speed in 4wd"? I have been asked at least 7 or 8 times in the last week and seen 3 or 4 threads on it.
Title: Re: TJ 4 hi top speed
Post by: vantagetes on November 22, 2010, 05:10:44 PM
I think they are confusing driving speed WHILE in 4x4 with travelling speed while ENGAGING 4x4. I don't like putting mine in 4x4 going any faster than 30-40 km/h but supposedly most t-cases are good for up to 80 km/h. Play around with it and pull slowly. If you get any noise you're going too fast....not to mention that if you're needing 4x4 you probably should be dicking around with your hand off the wheel trying to get it into 4x4 and should slow the %$^# down anyways...
Title: Re: TJ 4 hi top speed
Post by: cLAY on November 22, 2010, 05:35:44 PM
I shifted my old XJ in and out at speeds above 80km/h quite often. Trick is to do it with out load on the drivetrain. Accelerate slightly and then let off and jsut as you let off shift the t-case. If you catch it before the load comes back on from deceleration it will go smoothly. Also don't yank on it or pull hard. It should go easy, if not try again or slow down.
Title: Re: TJ 4 hi top speed
Post by: Vinman on November 22, 2010, 05:41:39 PM
I shifted my old XJ in and out at speeds above 80km/h quite often. Trick is to do it with out load on the drivetrain. Accelerate slightly and then let off and jsut as you let off shift the t-case. If you catch it before the load comes back on from deceleration it will go smoothly. Also don't yank on it or pull hard. It should go easy, if not try again or slow down.

Exactly the way I used to shift my Jeeps, smooth as silk.

Vince
Title: Re: TJ 4 hi top speed
Post by: FiEND on November 22, 2010, 05:50:38 PM
i forgot to lock my hubs, now that was a good grind session
Title: Re: TJ 4 hi top speed
Post by: Jrama on November 22, 2010, 06:02:17 PM
Don't see why people keep saying its so difficult to switch from 2H to 4H, Can you change gear from 1st to 2nd without an accident? If not, you probably have bigger problems then winter driving
Title: Re: TJ 4 hi top speed
Post by: vantagetes on November 22, 2010, 06:04:57 PM
Don't see why people keep saying its so difficult to switch from 2H to 4H, Can you change gear from 1st to 2nd without an accident? If not, you probably have bigger problems then winter driving

It's not difficult but if the traction situation is that bad that you need to swap to 4hi while going along, you probably shouldn't be diverting your attention to anything other then trying not to kill yourself/half of deerfoot.
Title: Re: TJ 4 hi top speed
Post by: Tinkerer on November 22, 2010, 08:17:11 PM
Don't see why people keep saying its so difficult to switch from 2H to 4H, Can you change gear from 1st to 2nd without an accident? If not, you probably have bigger problems then winter driving

Most people don't have to look down to shift from 1st to 2nd, but other than those in the club who do it regularly, most people have to look down to shift the t-case lever.
Title: Re: TJ 4 hi top speed
Post by: BlackYJ on November 22, 2010, 08:23:47 PM
I believe that it does actually say in the owners manual not to shift into 4HI at speed above 80 km/h, but once engaged there should be no limit.  I agree with Clay's tip as well about accelerating and then letting off the gas, it works great.
Title: Re: TJ 4 hi top speed
Post by: WhiteOut on November 22, 2010, 08:37:18 PM
I can't shift from 1-2 even if I look at the shifter and the clutch.
Title: Re: TJ 4 hi top speed
Post by: fraserr7 on November 22, 2010, 08:58:42 PM
Wasn't asking about engaging.. I was asking about a maximum speed while in 4 hi, not confused at all, nice try though.
Title: Re: TJ 4 hi top speed
Post by: vantagetes on November 22, 2010, 10:02:26 PM
Wasn't asking about engaging.. I was asking about a maximum speed while in 4 hi, not confused at all, nice try though.

No no not you, Whiteout has been asked a bunch of times this week. I was talking about them. As for actual travel speed, probably faster then your jeep can and should go in 4x4 conditions ;)
Title: Re: TJ 4 hi top speed
Post by: apex on November 22, 2010, 10:21:36 PM
Is there a limit to how fast I can go in 4 hi? I have a stock TJ 4 banger 5 speed...

No.
Now, given it's a 4 banger and a Jeep... I'd say 130km/hr downhill.  ;)
Title: Re: TJ 4 hi top speed
Post by: parabs on November 22, 2010, 10:39:21 PM
there should be a pdf of your owners manual somewhere online, that will have the info you desire.

In my old 04 f150 screw I didnt have a problem going into 4-hi at 110km/h, nor do I have an issue in the current 08 ford.  Owners manual doesnt say anything about a top speed, but interestingly, I was recently reading about the SVT Raptor, and it as a electronic rear locker that can be used on dry pavement up to a speed of 105 MPH  :o :o :o :o :o :o


 :o :o

Holy crap!
Title: Re: TJ 4 hi top speed
Post by: Knox on November 23, 2010, 06:35:59 AM
I can't shift from 1-2 even if I look at the shifter and the clutch.

wut?

I had that problem the other week, when the shifter and the clutch were on the garage floor. :P
Title: Re: TJ 4 hi top speed
Post by: Immortal on November 23, 2010, 08:39:38 PM
Yeah... Fras don't know how to drive stick.
Title: Re: TJ 4 hi top speed
Post by: Rubi03 jef on November 23, 2010, 09:12:09 PM
personaly . if you have to be in 4x4 on the highway you probably shouldnt be doing 120 in those conditions

2 wheel drive is just as safe if you are drive to the conditions
and if you know how to controp the occasional fish tail

dont apply the brakes  RULE NUMBER ONE
Title: Re: TJ 4 hi top speed
Post by: Spinalguy on November 24, 2010, 10:44:51 AM
Why use 4x4?
On my drive to and from work, i pass over many iced bridges and on/off ramps. i like that my truck does not fishtail at all when passing over these structures.
i like that i can pull away at ANY intersection without holding anyone behind me up.
i like that i can travel highways at 120+ in 4wd and KNOWING that no matter how road conditions change or deteriorate, i will not NEED to control any fishtailing as it will not happen in 4x4.
Stopping is the same no matter 2 or 4wd. And that is where caution and driving conditions must be taken into consideration.

Why have 4wd and not use it? In the past 2 weeks, there would be no damage to the 4wd system.
No fishtailing, no surprise ice sections...on and on.
Title: Re: TJ 4 hi top speed
Post by: FiEND on November 24, 2010, 10:48:55 AM
stopping isnt quite the same if you gear down.  gearing down in 2 wheel makes me slide more.

my pet peeve is that people sit and spin at lights and make everything more icey for the next people.  i know its not their fault but if someone who has 4 wheel drive sits and spins in 2 wheel drive, that would be my peeve.
Title: Re: TJ 4 hi top speed
Post by: Jrama on November 24, 2010, 12:08:53 PM
I'd have to agree that if you have 4x4 and don't use it on the street or only when your already stuck, It almost completely negates the point of having a 4x4 in the first place. The increased wear on components likely isn't even measurable. Right now I am driving with a locked front in 4x4 and it lets me know immediately when there is too much grip on the road. Even the ploughed roads don't upset the locker much. If i tried this in summer I would need a new front axle. Just shows how much easier the tires slide on the road, even when lightly glazed with snow.


 If you ask me a rear wheel drive TJ/YJ for example is probably one of the most unsafe winter vehicles you can have, if it wasn't for 4x4. No traction control, short wheel base,(no abs on mine) and rear wheel drive. Having the mentality that 4x4 is a last option, is just.....ridiculous. Even letting off the gas on some of these roads in Rocky view in 2H will send the back wagging around.