Motor moving forward when accelerating - Page 6 - JeepForum.com

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post #76 of 105 Old 05-10-2013, 03:49 PM
Project1
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Quote:
Originally Posted by Kevin108 View Post
Everybody says that then half of them complain about vibes and take them back out.
oh man I LOOOOOOOVE mine ... I did the brown dogs and a trans mount at the same time and it was such a big difference .. Everthing felt so much stronger and more solid, huge difference when driving and taking corners. I was super impressed. I would say 100% get them


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post #77 of 105 Old 05-10-2013, 03:56 PM
PaYankee
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Quote:
Originally Posted by Project1

oh man I LOOOOOOOVE mine ... I did the brown dogs and a trans mount at the same time and it was such a big difference .. Everthing felt so much stronger and more solid, huge difference when driving and taking corners. I was super impressed. I would say 100% get them
The vibes are awful. With the ac on it felt like I was in a massaging chair. I would only recommend the mounts for hardcore offroaders.

99 xj 2wd/94xj 4wd np231 3lift
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post #78 of 105 Old 05-10-2013, 04:03 PM Thread Starter
97hero
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I know the Brown Dog mounts are stronger, I have heard good and bad about em...My thinkin right now is I JUST WANT THIS ISSUE FIXED!!! It's drivin me bat sh*t thing is about the Brown dogs is even if it did fix it, it would just be covering up the issue, seems the problem would just find the next weak point to transfer the energy instead of it being obsorbed with the OEM rubber mounts(and the back of my fan)...eventually I would have to address whatever it is causing this. correct me if I'm wrong...hell maybe the Brown dogs are some kinda magical mounts that fix all problems...if so maybe we should get the Government some Brown dogs...they might be able to fix the economy...LOL
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post #79 of 105 Old 05-10-2013, 04:19 PM
Project1
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Quote:
Originally Posted by PaYankee View Post
The vibes are awful. With the ac on it felt like I was in a massaging chair. I would only recommend the mounts for hardcore offroaders.
Maybe the mounts are not the problem .. maybe your engine needs a little love... My jeep is super smooth and even idles very well ...

You probably have some other issues and they just show more with the mounts. I have no vibe problems at all.

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post #80 of 105 Old 05-10-2013, 04:25 PM
Project1
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Quote:
Originally Posted by 97hero View Post
I know the Brown Dog mounts are stronger, I have heard good and bad about em...My thinkin right now is I JUST WANT THIS ISSUE FIXED!!! It's drivin me bat sh*t thing is about the Brown dogs is even if it did fix it, it would just be covering up the issue, seems the problem would just find the next weak point to transfer the energy instead of it being obsorbed with the OEM rubber mounts(and the back of my fan)...eventually I would have to address whatever it is causing this. correct me if I'm wrong...hell maybe the Brown dogs are some kinda magical mounts that fix all problems...if so maybe we should get the Government some Brown dogs...they might be able to fix the economy...LOL
You have the right idea man ... its like this .. you will have to work on your jeep its a jeep.

When you fix something ... the fastest and cheapest way to fix it is to fix it right the first time, because its always a pain and expensive to go back and do it again.

There is nothing wrong with the brown dogs they are great, get them. That is the right way to fix your problem ... they are A+.

You will have other problems, and fix them one at a time and slowly you have have a jeep that runs great.

Look at my build thread, the before and after motor build pic ...

I started with a jeep that was a disaster I got for 1500$ .. and I just pick the very biggest problem and fix it and then go to the next one. After a little time , your problems get smaller and less frequent, and your jeep starts to run awesome and you love it

All part of owing a jeep .. but in the end .. its the only way to roll

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post #81 of 105 Old 05-10-2013, 04:56 PM
PaYankee
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Quote:
Originally Posted by 97hero
Here are a couple pics...
That replacement fan you got is sticking out way to far. I suspect that you ended up with one from a grand cherokee. Here is a pic of my xj fan that I just took.
Attached Thumbnails
image-4202845349.jpg  

99 xj 2wd/94xj 4wd np231 3lift

Last edited by PaYankee; 05-10-2013 at 05:33 PM.
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post #82 of 105 Old 05-10-2013, 05:01 PM
Project1
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Originally Posted by PaYankee View Post
That replacement fan you got is sticking out way to far. I suspect that you ended up with one from a grand cherokee. Here is a pic from mine that I just took.
Thats one mod I did . .I choped the fan and put in a second E fan .. works great

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post #83 of 105 Old 05-10-2013, 05:03 PM
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Quote:
Originally Posted by Project1

Thats one mod I did . .I choped the fan and put in a second E fan .. works great
I am trying to say that the replacement fan he got is to big.

99 xj 2wd/94xj 4wd np231 3lift

Last edited by PaYankee; 05-10-2013 at 05:14 PM.
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post #84 of 105 Old 05-10-2013, 05:04 PM
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Quote:
Originally Posted by PaYankee

That replacement fan you got is sticking out way to far. I suspect that you ended up with one from a grand cherokee. Here is a pic from mine that I just took.
Compare the two.
Attached Thumbnails
image-3337375578.jpg   image-3362939603.jpg  

99 xj 2wd/94xj 4wd np231 3lift
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post #85 of 105 Old 05-10-2013, 05:07 PM
habbyguy
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From what I've read, the drive shafts for a Chrysler 8.25 diff are shorter than those for a D35. That said, I don't know what the right length is - apparently there are a whole lot of different transmission / transfer case / differential combinations, and therefore a lot of different driveshaft lengths that were supplied. I guess the key is to get a feel for whether the splines are nearly or fully engaged with the shaft in place (before the tranny is put in gear). On mine, I can remember being able to move the shaft forward quite a bit more than necessary to fit it into the rear U-joint mounts (I'm thinking by 3" or so, maybe more than that). I guess if you'd noticed that you didn't have much play when you dropped the shaft (that is, you could just barely get the rear U-joint into the pinion carrier), then it's likely your rear driveshaft is too long for the application. Hopefully someone here has the same engine / tranny / transfer case / diff as your XJ and can do a quick measurement to see if your shaft is the right one (or not).

I'm having trouble thinking of what else it could be - if the motor and tranny mounts are in the right place (and I suspect they are!), and we KNOW they're good - AND the radiator mount and shroud are in the right place (and it sure sounds like it), then all that's left is something that's "pushing" that tranny/engine assembly forward. I can't think of anything in the engine / tranny / transfer case that COULD push the engine forward, at least not with good motor and tranny mounts. That leaves only what's behind the transfer case, and that shouldn't be possible unless the "push" is in excess of what is taken up by the splines in the driveshaft coupling, which should give you at LEAST a few inches of slop before anything gets pushed around.
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post #86 of 105 Old 05-10-2013, 05:11 PM
PaYankee
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Quote:
Originally Posted by PaYankee

Compare the two.
Here is another
Attached Thumbnails
image-240232917.jpg  

99 xj 2wd/94xj 4wd np231 3lift
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post #87 of 105 Old 05-10-2013, 05:24 PM Thread Starter
97hero
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Intresting...the fan I got said direct fit OEM, but there is a clearance difference for sure...what brand and where did you get yours?
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post #88 of 105 Old 05-10-2013, 05:26 PM
Project1
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Quote:
Originally Posted by PaYankee View Post
I am trying to say that the replacement fan he got is to big.
I see .. yea that would be bad

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post #89 of 105 Old 05-10-2013, 05:26 PM
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Quote:
Originally Posted by 97hero View Post
Intresting...the fan I got said direct fit OEM, but there is a clearance difference for sure...what brand and where did you get yours?
That's probably right ... my stock fan sticks out so much more than my aftermarket efan .. I actually and using one from an Audi turbo .. I use to have the 2speed ford SHO fan but I switched

You can see which one is my stock fan..

My stock fan runs all the time and the audi fan just runs as needed.


You can see the brown dog's in that pic too
Attached Thumbnails
motor2.JPG  

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post #90 of 105 Old 05-10-2013, 05:29 PM
PaYankee
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Quote:
Originally Posted by 97hero
Intresting...the fan I got said direct fit OEM, but there is a clearance difference for sure...what brand and where did you get yours?
basically that stupid middle section on that fan is ruining everything.
No point in buying a new fan. Go get one from a junkyard or buy a factory xj fan from someone on here. They are not known to go bad. Mine never turns on unless I have the ac on anyway. Or just get the right size new whatever is easier.

99 xj 2wd/94xj 4wd np231 3lift
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