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-   -   Jumpy transmission? (http://www.wranglerforum.com/f210/jumpy-transmission-227654.html)

CountryBoyJeep 03-14-2013 03:13 PM

Jumpy transmission?
 
How long I've had my Jeep I've never thought to put this on here.
When I shift into like drive, or reverse or anything my Jeep sort of like Jumps up or down.
That's the best explanation I can give.
Anyone ever have this problem? and what is the cause? any way to fix it?

snowbrd84 03-14-2013 03:33 PM

What RPM is your motor idling at? If it is too high, it will "slam" into gear. Also, if you have been motor or trans mount, that could be a problem as well.

Lando25 03-14-2013 04:08 PM

Quote:

Originally Posted by CountryBoyJeep (Post 3503762)
How long I've had my Jeep I've never thought to put this on here.
When I shift into like drive, or reverse or anything my Jeep sort of like Jumps up or down.
That's the best explanation I can give.
Anyone ever have this problem? and what is the cause? any way to fix it?

My 32RH does the same thing, its not violent but nothing else that I have driven shifts like that.

CountryBoyJeep 03-14-2013 07:15 PM

Quote:

Originally Posted by snowbrd84 (Post 3503825)
What RPM is your motor idling at? If it is too high, it will "slam" into gear. Also, if you have been motor or trans mount, that could be a problem as well.

It starts out near 1000 rpm when cold as like I guess high idle but after running its closer to 650 rpm. This probably is the problem but is there a way to fix it?

cbush1885 03-14-2013 07:20 PM

mine does this as well, i assume its normal, mine got worse after i lifted it, when i put it in drive it squats down, when i put it in drive it lifts up

CountryBoyJeep 03-14-2013 07:23 PM

Quote:

Originally Posted by cbush1885 (Post 3504527)
mine does this as well, i assume its normal, mine got worse after i lifted it, when i put it in drive it squats down, when i put it in drive it lifts up

Exact same as mine, and definitely worse with a lift

jp2611 03-14-2013 07:25 PM

Quote:

Originally Posted by CountryBoyJeep (Post 3504547)
Exact same as mine, and definitely worse with a lift

now I am twice as confused as when I read post #5:surrender:

CountryBoyJeep 03-14-2013 07:46 PM

Quote:

Originally Posted by jp2611 (Post 3504557)
now I am twice as confused as when I read post #5:surrender:

It's a very confusing matter lol, that's why I need help to solve it and felt the need to post it

jp2611 03-14-2013 07:49 PM

please explain post #5
"when i put it in drive it squats down, when i put it in drive it lifts up"

How does that work?

WVU Mountainman 03-14-2013 07:51 PM

Mine does the same thing. Definitely more noticeable after my lift.

CountryBoyJeep 03-14-2013 07:54 PM

Quote:

Originally Posted by jp2611 (Post 3504672)
please explain post #5
"when i put it in drive it squats down, when i put it in drive it lifts up"

How does that work?

It acts like one of those special suspensions on ghetto cars that bumps up and down. The Jeep literally either drops down or lifts up.

Quote:

Originally Posted by WVU Mountainman (Post 3504680)
Mine does the same thing. Definitely more noticeable after my lift.

It's crazy isnt it?

jp2611 03-14-2013 07:58 PM

I am totally lost will just follow...I am no help as in my mind it cant do both go down and go up...so either I don't understand what you are saying, (entirely possible) or I can't be smart enough to get my head around what you are saying....so not gonna be any help...but wanna learn

WVU Mountainman 03-14-2013 08:02 PM

Quote:

Originally Posted by CountryBoyJeep (Post 3504699)

It acts like one of those special suspensions on ghetto cars that bumps up and down. The Jeep literally either drops down or lifts up.

It's crazy isnt it?

It sure is. The first few times was really strange as I was not expecting it. I'm used to it now. I get in my other vehicles and expect the same thing. Doesn't happen though :)

CountryBoyJeep 03-14-2013 08:06 PM

Quote:

Originally Posted by jp2611 (Post 3504710)
I am totally lost will just follow...I am no help as in my mind it cant do both go down and go up...so either I don't understand what you are saying, (entirely possible) or I can't be smart enough to get my head around what you are saying....so not gonna be any help...but wanna learn

Nothing wrong with learning haha

Quote:

Originally Posted by WVU Mountainman (Post 3504716)
It sure is. The first few times was really strange as I was not expecting it. I'm used to it now. I get in my other vehicles and expect the same thing. Doesn't happen though :)

I'm used to it to and whenever a girl rides with me I tell her I fixed my jeep up to do that haha, I wanna know how to fix it still though lol

Tsexton223 03-14-2013 08:07 PM

I think I have the same issue. I started a thread recently about this. Mine usually revs up when I reverse. It is aggravating because I'm worried that when my wife drives my jeep, she may accidentally back into someone. I have pretty much gotten used to it but it is still a hassle. It seems like a sensor issue with mine rather than a suspension problem. Just figured since y'all were talking about "up and down" that you were talking about rpm's.

CountryBoyJeep 03-14-2013 08:11 PM

Quote:

Originally Posted by Tsexton223 (Post 3504731)
I think I have the same issue. I started a thread recently about this. Mine usually revs up when I reverse. It is aggravating because I'm worried that when my wife drives my jeep, she may accidentally back into someone. I have pretty much gotten used to it but it is still a hassle.

That really could be a problem. Can this thread attract some more attention so we can answer this?

Tsexton223 03-14-2013 08:15 PM

Just in case it matters...'05 sport 4.0L auto. Nothing more than a 2" lift and 31's.

Full Spool 03-14-2013 08:22 PM

Quote:

Originally Posted by cbush1885 (Post 3504527)
mine does this as well, i assume its normal, mine got worse after i lifted it, when i put it in drive it squats down, when i put it in drive it lifts up

The word drive usually means automatic transmission.
Sooooo. if it's an automatic transmission, does it want to take off when you let off the brake? Or does it just want to crawl forward?
Sounds like a torque converter issue.

CountryBoyJeep 03-14-2013 08:34 PM

Quote:

Originally Posted by Full Spool (Post 3504800)
The word drive usually means automatic transmission.
Sooooo. if it's an automatic transmission, does it want to take off when you let off the brake? Or does it just want to crawl forward?
Sounds like a torque converter issue.

It probably is an automatic thing. Mines automatic

Full Spool 03-14-2013 08:34 PM

Quote:

Originally Posted by CountryBoyJeep (Post 3504547)
Exact same as mine, and definitely worse with a lift

If the springs are taller, yet have the same tensile strength as the replaced shorter springs; there is a softer ride from the added material in the springs. With the end component of the drive train being the wheels, the motor is attempting to rotate the axles because the brakes are keeping the wheels from turning. Axle wrap is attempting to cause the spring to compress or stretch because in effect the longer spring is less able to keep the axle in a constant position.

CountryBoyJeep 03-14-2013 08:41 PM

Quote:

Originally Posted by Full Spool (Post 3504862)
If the springs are taller, yet have the same tensile strength as the replaced shorter springs; there is a softer ride from the added material in the springs. With the end component of the drive train being the wheels, the motor is attempting to rotate the axles because the brakes are keeping the wheels from turning. Axle wrap is attempting to cause the spring to compress or stretch because in effect the longer spring is less able to keep the axle in a constant position.

Dumb-man's english please?

Full Spool 03-14-2013 08:46 PM

Quote:

Originally Posted by CountryBoyJeep (Post 3504900)
Dumb-man's english please?

The control arms keep the axle from twisting when torque is applied, so the only place for the energy to be released is through the springs.

Spring strength is a science, and several suspension manufactures have different strength springs you can choose from.

A lot of people try to adjust it through shocks. Because springs are an expensive way to experiment.

BigCrave 03-15-2013 08:13 AM

Post a video of it so we can all see whats going on with it

Lando25 03-15-2013 10:42 AM

Quote:

Originally Posted by Full Spool (Post 3504800)
The word drive usually means automatic transmission.
Sooooo. if it's an automatic transmission, does it want to take off when you let off the brake? Or does it just want to crawl forward?
Sounds like a torque converter issue.

At least with mine, when I let of the brake it moves at a decent pace. I wouldn't say it takes off.


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