motor mounts and tranny mounts

[Sick5]

how do you know when they are bad and need to be replace?
oh and how can you tell without taking out the engine or the tranny.
i was told once if the motor moves to one side greatly while steeping on the gas motor mount is bad. but what about the tranny how can you tell...

[protrash64]

IMO, if they are not ripped, then they are good. If you are swapping engines then it would be good to change them being that everything is out. If your trans has a newer style mount at the back with a crossmember You could jack up on the tailshaft lightly to see if it seperates.

Also, during normal driving/accelerating you may have weird vibrations or clunking if they are torn.

[Sick5]

i have a vibration as if your on the side of the freeway hitting the wake up bumps lmao
thats what i call it. it starts around 60 and goes away a lil around 65 70 and comes back
louder around 80
not to mention when i accelerat it tends to sway to the right and let the peddal go sway to the left.

[Rich 5150 69]

Not sure how old many of you are but some can remeber the early sixties impalas, mine being a 62 ss, it had powerglide 327, well when the left motor mount went bad, engine torque would rotate the motor over to the right, smash the kickdown linkage to the floor..... wide open throttle til the torque leveled off it was one wild ride...anyways the left side motor mount is the critical one, all the newer cables have eliminated the wild ride syndrome...the right side is just along for the ride.

[Rich 5150 69]

Thats sounds more like driveline inclination issues, have you shimmed the rear axle after you lowered it? Or universal issues...needs checking before use.

[Sick5]

Originally Posted by Rich 5150 69

Not sure how old many of you are but some can remeber the early sixties impalas, mine being a 62 ss, it had powerglide 327, well when the left motor mount went bad, engine torque would rotate the motor over to the right, smash the kickdown linkage to the floor..... wide open throttle til the torque leveled off it was one wild ride...anyways the left side motor mount is the critical one, all the newer cables have eliminated the wild ride syndrome...the right side is just along for the ride.

what about the tranny

[Rich 5150 69]

Sich read my last post we posted same time...

[Sick5]

Originally Posted by Rich 5150 69

Thats sounds more like driveline inclination issues, have you shimmed the rear axle after you lowered it? Or universal issues...needs checking before use.

not sure what your talkng about?

[Rich 5150 69]

When you lowered your truck one thing that happens is the rear axle will rotate upwards, due to the way it is mounted on the trailing arms, to correct this you have to shim the axle housing/ trailings arms with about 2 to 4 degree shims to correct this, and or you have a universal joint going out, use a pry bar agaisnt the universal wedged inbetween them and try to move it, if it moves at all it needs to be replaced, it will usally be the rear only but sometimes it could be front and rear. If the unversal comes apart at freeway speeds all hell breaks loose....

[Sick5]

only one thing.. i dont have trailing arms?
Gmc came with leaf springs i have a four link
i can take a pic of it in a min

[protrash64]

Originally Posted by Rich 5150 69

If the unversal comes apart at freeway speeds all hell breaks loose....

Yeah, can you say pole vault!!!

[Sick5]

pic

[Rich 5150 69]

Take a close look at the pinion and universal / drive shaft, it should, ( pinion ) have a slight downward angle to it 3- 5 degrees, if its close you should alright otherwise start checking universals, wheel lugs, sticking brake drums, axles, bearings in axles.

[Sick5]

the pinion angle depends on what ride hight im on if i slam it all the way down it pionts down if i raise it it points up
as the picture show it almost fully aired up

[Rich 5150 69]

Then start looking at everything else, even for loose or broken welds.

[markeb01]

Here's an article on pinion angle that may prove helpful:

http://www.carcraft.com/howto/91758/index.html

[Sick5]

Originally Posted by markeb01

Here's an article on pinion angle that may prove helpful:

http://www.carcraft.com/howto/91758/index.html

THANKS this will come in handy

[padresag]

to check your motor mounts ; just get it running ,foot on th brake and put it in gear and give it a little throttle and if the mount lifts off, it needs a new one one. for the trans ,just lift up on the rear of the tranny and if the mount seperates it needs replacing. check your ujoints and centre brg an support if it has one. check to see whether or not that there is a broken centre bolt in either of the rear springs; the bolt which goes through the centre of the spring and the head of it resides in the spring perch; stops it from going forwards and backwards. tires need balancing or perhaps you may have a seperation or two in a tire or tires, all which will give you vibration. sometimes it is just the nut behind the wheel
ron

[Sick5]

Originally Posted by padresag

to check your motor mounts ; just get it running ,foot on th brake and put it in gear and give it a little throttle and if the mount lifts off, it needs a new one one. for the trans ,just lift up on the rear of the tranny and if the mount seperates it needs replacing. check your ujoints and centre brg an support if it has one. check to see whether or not that there is a broken centre bolt in either of the rear springs; the bolt which goes through the centre of the spring and the head of it resides in the spring perch; stops it from going forwards and backwards. tires need balancing or perhaps you may have a seperation or two in a tire or tires, all which will give you vibration. sometimes it is just the nut behind the wheel
ron

lol well i dont have rear spring i have airbags

[Sick5]

Originally Posted by Rich 5150 69

Then start looking at everything else, even for loose or broken welds.

Rich your scarying me with the broken well talks

[padresag]

Originally Posted by Sick5

lol well i dont have rear spring i have airbags

well then perhaps something there doesn't line up properly which could also give you a problem. all points were just guidelines where problems can occur. perhaps if you got under your truck and checked a few things you might be able to find the problem. the internet isn't goig to fix it for you
ron

[Sick5]

Originally Posted by padresag

well then perhaps something there doesn't line up properly which could also give you a problem. all points were just guidelines where problems can occur. perhaps if you got under your truck and checked a few things you might be able to find the problem. the internet isn't goig to fix it for you
ron

are you SURE!!!!
information help everyone i might not be the only one having this problem.there might be someone else that fig it out and fixed it doing this way or found out that he had a loose bolt on his rear springs. what ever the case may be
thanks for info guys

[lakeroadster]

Originally Posted by Rich 5150 69

Not sure how old many of you are but some can remeber the early sixties impalas, mine being a 62 ss, it had powerglide 327, well when the left motor mount went bad, engine torque would rotate the motor over to the right, smash the kickdown linkage to the floor..... wide open throttle til the torque leveled off it was one wild ride...anyways the left side motor mount is the critical one, all the newer cables have eliminated the wild ride syndrome...the right side is just along for the ride.

I lived that dream too! I remember my dad burning rubber through a redlight and then reaching up and turning the engine off.

Took it to the dealership and they wrapped a chain around the motor mount to hold it in place.

Needless to say the old man wasn't impressed.

[padresag]

Originally Posted by Sick5

i have a vibration as if your on the side of the freeway hitting the wake up bumps lmao
thats what i call it. it starts around 60 and goes away a lil around 65 70 and comes back
louder around 80
not to mention when i accelerat it tends to sway to the right and let the peddal go sway to the left.

great explanation, it really doesn't explain much, elaborate as this (i have a vibration as if your on the side of the freeway hitting the wake up bumps lmao) sounds like a flat tire. this sounds like wheel balance-it starts around 60 and goes away a lil around 65 70 and comes back
what is swaying in this instance-"not to mention when i accelerat it tends to sway to the right and let the peddal go sway to the left"
it is going to be amazing if someone else has those same symptoms
ron

[Sick5]

Originally Posted by padresag

great explanation, it really doesn't explain much, elaborate as this (i have a vibration as if your on the side of the freeway hitting the wake up bumps lmao) sounds like a flat tire. this sounds like wheel balance-it starts around 60 and goes away a lil around 65 70 and comes back
what is swaying in this instance-"not to mention when i accelerat it tends to sway to the right and let the peddal go sway to the left"
it is going to be amazing if someone else has those same symptoms
ron

the vibration is coming from two things my tranny mount is shoot and my wheels need to be balance. And the swaying that's because of one my four link bushings is wearing out so as you hit the pedal rear sways. And yah most likely someone with a four links would have this issue if they went with bushing tie rod instead of fish eye ones. Oh one more things thanks for your info ron