driveline movement
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Senior User
Joined: Aug 2013
Posts: 355
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From: Peoria IL
driveline movement
Hi,
56 F100
351c
c4
jag rear
not sure the front - S10 or Mustang 2
Issue - when I really stomp on the gas the engine & transmission move forward so far they actually pull the shifter into 2nd gear.
I got the water pump to touch the fan.
when I look visually everything looks fine - the trans mount is brand new - could a motor mount be broken? How could I tell?
56 F100
351c
c4
jag rear
not sure the front - S10 or Mustang 2
Issue - when I really stomp on the gas the engine & transmission move forward so far they actually pull the shifter into 2nd gear.
I got the water pump to touch the fan.
when I look visually everything looks fine - the trans mount is brand new - could a motor mount be broken? How could I tell?
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
I've seen plenty of engines that rock side to side, but never one that moved fore and aft, especially with an IRS. There is definitely something wrong, my money is on broken or disconnected motor mounts. Easiest way to tell, besides watching where it's moving while you goose the throttle, would be to put a piece of 2x8 under the oil pan sump on top a floor jack and jack up on the engine. It should be pretty obvious what's wrong when the engine lifts off the mount(s).
Lead Driver
Joined: Aug 2006
Posts: 8,096
Likes: 655
From: Brentwood, TN
Check the end play on the driveshaft yolk, if the differential is torquing then it may be pushing the driveshaft forward...without the proper end play then there is only one way the the trans/engine can be pushed.
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Senior User
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From: Peoria IL
when i bought it - they had literally just installed the transmission. they guy said he was going to go under & make sure everything was tightened up.
I wonder if they didn't bolt down the engine? ha that would suck.
I wonder if they didn't bolt down the engine? ha that would suck.
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Senior User
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From: Peoria IL
I'll try jacking it up first & the shaft play second.
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From: Peoria IL
I do not have this issue when doing burn outs - if the truck does not lurch forward the problem is not there.
So it is definately moving when under load - it has to be either the motor mounts are not bolted down or the drive shaft is a hair too long.
So it is definately moving when under load - it has to be either the motor mounts are not bolted down or the drive shaft is a hair too long.
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Elder User
Joined: Oct 2011
Posts: 564
Likes: 2
From: Buffalo
good idea - I have a u-joint going out - I get a clunk - the truck only has 5k miles since being built - it could be this is putting pressure on the joint causing premature failure - the drive shaft would have to have been custom made.
I'll try jacking it up first & the shaft play second.
I'll try jacking it up first & the shaft play second.
Just a thought.
Wally
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Thread Starter
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Senior User
Joined: Aug 2013
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From: Peoria IL
the rear suspension sinks significantly when I get on it. The jag rear end has 4 springs & 4 shocks - but it sinks a good 4 or 5 inches when i drop the hammer.
I've been meaning to replace the 4 shocks with a set of air shocks to help keep the rear in place.
hmmmm - I think we are narrowing it down.
I've been meaning to replace the 4 shocks with a set of air shocks to help keep the rear in place.
hmmmm - I think we are narrowing it down.
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Senior User
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From: Peoria IL
so if the yolk is too long - can I just cut it down? Its not like a 4x4 where I'll get extreme axel droop from jumping or crawling over rocks.
But I blast around like I'm in my own personal rocket all the time.
But I blast around like I'm in my own personal rocket all the time.
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Joined: Oct 2011
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From: Buffalo
Wally
Elder User
Joined: Oct 2011
Posts: 564
Likes: 2
From: Buffalo
Wally
Posting Guru
Joined: Sep 2012
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You may want to be a little cautious about how much torque you subject that Jaguar rear end to. When they hook up well, they can pretty much be torn right out of the vehicle.
I had an '86 XJ6 with a SBC 350.
BTW: my buddy who bought it is finally selling the body/chassis. It's in the Dallas area. If somebody wants it, PM me.
I had an '86 XJ6 with a SBC 350.
BTW: my buddy who bought it is finally selling the body/chassis. It's in the Dallas area. If somebody wants it, PM me.
Last edited by The Horvaths; Nov 18, 2013 at 07:09 PM. Reason: Typo