driveline movement
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Senior User
Joined: Aug 2013
Posts: 355
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From: Peoria IL
I jacked the engine with a 2x6 under the oil pan. The engine didn't move. The mounts look great.
I took pics of the tail shaft. It looks to have plenty of play.
I guess next I will have to strap my video camera under the truck & make a couple quick starts.
I took pics of the tail shaft. It looks to have plenty of play.
I guess next I will have to strap my video camera under the truck & make a couple quick starts.
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
Then I'd believe the radiator is moving back, not the engine moving forwards. Do you have the front support rods between the air deflectors and the firewall? Inner fenders? You don't have a tilt front end or a rubber mounted radiator by chance?
Posting Guru
Joined: Sep 2011
Posts: 1,409
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From: Clitherall, MN.
Wouldn't the front of the diff want to lift when a large amount of torque is applied?Essentially going the opposite way the wheels go due to the torque .I would think that would try to pull the yoke out of the trans. Dunno, maybe you need to stop wearin' that lead shoe.
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
Wouldn't the front of the diff want to lift when a large amount of torque is applied?Essentially going the opposite way the wheels go due to the torque .I would think that would try to pull the yoke out of the trans. Dunno, maybe you need to stop wearin' that lead shoe.
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Senior User
Joined: Aug 2013
Posts: 355
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From: Peoria IL
Rad may be moving back.
I have tilt front.
I have support rods.
I don't think this is the problem though because the shifter pulls into 2nd gear.
Hell maybe it's just a linkage issue
I have tilt front.
I have support rods.
I don't think this is the problem though because the shifter pulls into 2nd gear.
Hell maybe it's just a linkage issue
Posting Guru
Joined: Apr 2005
Posts: 1,155
Likes: 7
From: Sweden (Fagersta)
I have seen manu different way the JAG IRS has been mounted.
Worst case is just mounting the diff in the top 4 bolt hole. They are just there to take the weight of the diff. NOTHING ELSE.
The bending of the diff (Front/Rear) (Side / side ) should be taken by some kind of struts connected to the front and rear mount of the lower suspension arms. Orignial the whole package is contained in a stamped sheetmetal "box"
If you lack this "struts" I sincerly encourage you to get one before you drop the diff onto the freeway
Worst case is just mounting the diff in the top 4 bolt hole. They are just there to take the weight of the diff. NOTHING ELSE.
The bending of the diff (Front/Rear) (Side / side ) should be taken by some kind of struts connected to the front and rear mount of the lower suspension arms. Orignial the whole package is contained in a stamped sheetmetal "box"
If you lack this "struts" I sincerly encourage you to get one before you drop the diff onto the freeway
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Senior User
Joined: Aug 2013
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From: Peoria IL
Diff is mounted rigid to a custom cross member. No link bars or other silliness. 4 springs. 4 shocks. All bolted to the cross member.
I swear I took pics but now can't find them on this darn phone.
I think when I get time & have some good weather I'll drive to my local tranny shop & get it on a lift.
Everything appears to be right. Maybe I need to adjust the linkage.
I swear I took pics but now can't find them on this darn phone.
I think when I get time & have some good weather I'll drive to my local tranny shop & get it on a lift.
Everything appears to be right. Maybe I need to adjust the linkage.
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Posting Guru
Joined: Apr 2005
Posts: 1,155
Likes: 7
From: Sweden (Fagersta)
Ok you might think links are silly, but if I put it like this. If I would mount my new 9" with 4 vertical bolts in the centre, every one would laugh at me and tell me "that aint right" "that will never hold"
It's your diff and life 0
It's your diff and life 0
Posting Guru
Joined: Apr 2005
Posts: 1,155
Likes: 7
From: Sweden (Fagersta)
It is always hard to grasp sarcasm in writing, especially, when I am Swedish, and English is my second language.
And your last comment? I will leave that "as is"
I am just trying to help you?
And your last comment? I will leave that "as is"
I am just trying to help you?
Thread Starter
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Senior User
Joined: Aug 2013
Posts: 355
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From: Peoria IL
Let me be clear.
I greatly appreciate your help! I know nothing of jag rear ends.
I bought the truck I didn't build it & though I can turn a wrench I do not have the skill or knowledge to do any of this on my own.
Thank you for your knowledge sharing & help.
I was not aware of how this rear should be attached & was commenting on how it is attached.
Since I have limited knowledge I often gloss over details like link bars & other "silliness" - not meaning anything is silly, but as a representation of my ignorance.
Pointing out that I am ignorant however is not helpful.
I greatly appreciate your help! I know nothing of jag rear ends.
I bought the truck I didn't build it & though I can turn a wrench I do not have the skill or knowledge to do any of this on my own.
Thank you for your knowledge sharing & help.
I was not aware of how this rear should be attached & was commenting on how it is attached.
Since I have limited knowledge I often gloss over details like link bars & other "silliness" - not meaning anything is silly, but as a representation of my ignorance.
Pointing out that I am ignorant however is not helpful.
Posting Guru
Joined: Apr 2013
Posts: 1,170
Likes: 2
From: Rimrock AZ
Just a possibility but you could have a broken/loose transmission mount. Under load the trans could be lifting up. This would rock the engine forward on the mounts. When you put a jack under the engine everything would seem tight.