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#1 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Poly MOTOR MOUNTS and TRANNY MOUNTS
Has anyone used or are using both. I am thinking of putting both. I was told that the Poly Tranny mount alone is hard on the transmission case, there fore I want to install the motor and transmission mounts. Question is, do they cause ALOT of vibration. I like the stability of they poly mounts and have used them on on suspension and body. Those were stiff, but curious as if the motor and tranny mounts would cause excessive vibrations and such
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#2 |
Registered User
![]() Join Date: Sep 2009
Location: Lubbock Texas
Posts: 1,049
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Gary Terry "cheyenne superman" who has been doing these trucks before they were cool always advised us NOT to use the poly mounts so we have always taken his advice.
My 2 cents Paul
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You can shear a sheep every year, but you can only skin it once The person dealing with facts is never at the mercy of the person dealing with theory 1972 Cheyenne Super 402 400 A/c bucket seat tilt custom camper Longhorn 1975 Silverado 454 Crew cab camper special dually |
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#3 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Thanks, but any reasons why...
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#4 |
Registered User
Join Date: Dec 2009
Location: lindale,tx
Posts: 2,373
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
I have poly motor mount in both of my trucks. One is not running yet but the other i had stock ones in and my 6.0 moved the rubber in them and my motor was sitting croked. It moved one up and the other down. I cant really tell a differance with just the motor mounts in the vibration area. Motor moves WAY less now tho.
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82 c10 5.3/4l60 84 c20 5.3/sm465 85 chevy k10 suburban LQ4/4l60 91 chevy c10 suburban Lsa 5.3/4l60 2017 Silverado whipple 5.3 1964 Vw beetle 1974 vw beetle |
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#5 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
I have them. Shifter mounted to trans. No more vibration than before if anything more but smaller. The whole truck rolls and shakes more from the lumpy cam than anything Tuning the carb is easier since it don't move around so much.
Solid mounted engines can transmit an instant more tork than rubber mounts. Helps the overall et in a race and reaction time is a lil easier to dial. The benifits aren't grand but still there. Posted via Mobile Device
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#6 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
I have them. Shifter mounted to trans. No more vibration than before if anything more but smaller. The whole truck rolls and shakes more from the lumpy cam than anything Tuning the carb is easier since it don't move around so much.
Solid mounted engines can transmit an instant more tork than rubber mounts. Helps the overall et in a race and reaction time is a lil easier to dial. The benifits aren't grand but still there. Posted via Mobile Device Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#7 |
Registered User
Join Date: Sep 2009
Location: ottawa,canada
Posts: 4,550
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
.....every bushing in my truck is now poly! .....suspension, motor, trans, sway bar, and cab mounts....more efficient than 30 year old rubber.
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#8 |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,211
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Poly motor trans and cab. Cant recomend for control arms unless a grease zerk is used. Mine squeaked after the 1st rain.
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" That didnt make it any newer " " Dont antique the equipment " |
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#9 |
Account Suspended
Join Date: Oct 2012
Location: phx, az
Posts: 868
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
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#10 |
optomistic ah-so
Join Date: Mar 2009
Location: Charlotte, NC
Posts: 544
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Before poly became mainstream, and racers used solid mounts, the advisable practice was to use a motor plate or a four point mounting system (like our 3-speed trucks) with the solids. That prevented the aluminum transmissions from taking on any stresses.
If you used a three point mount THEN you needed a rubber mount at the tranny because the aluminum would crack much more easily, especially in the cast ears at the tailshaft. If you had an iron trans some street racers would put a rubber mount on the compression side of the engine, maybe with a tiedown or turnbuckle, to make it more comfortable for everyday driving. I am sure the recommendations about using poly on the trans mount developed from those recommendations. Whether it really is an issue or not should depend on what durometer the poly mounts are. You could even mix soft and hard poly mounts. Soft poly still provides the benefit of lasting far longer than the factories expected the trucks to last. I've learned that the only place you REALLY don't want to put poly in, is the truck arm front bushings. I haven't done it myself, but apparently even the soft poly bushings cause a bind that transfers the stress somewhere else--and I don't think any of us wants something else to get bent. The single place where poly bushings will show the greatest benefit especially in responsiveness, is in your shock eyes/mounts. The shock can have a horribly sloppy reaction with rubber bushings. Heck, I'd even recommend rod ends or monoball inserts there. As long as you are using "interlocking" motor mounts (either with tabs or through bolts) then the next step would be the rest of the suspension bushings except the track bar. After that the motor &/or trans mounts. Then yes even harder (or solid) body mounts will help performance in the twisties by tying the frame and sheet metal together for more structure--imitating a space frame or unibody.
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#11 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
I had the Poly bushings in the body mounts and the the suspension, including the control arms. I did like them but the suspension was considerable stiffer. I may even do it again, but kinda stuck on the motor and tranny mounts , stabilizing them more
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#12 | |
Registered User
Join Date: Jun 2012
Location: Minnesota
Posts: 509
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Quote:
I used poly bushings on a Mustang II, squeaked terrible and I hated it. Used them on my 97 K1500 upper arms, installed grease fittings and used silicone grease in them. Nary a squeak was heard. I did not notice a significant performance change in either vehicle, other than the polly strut rod bushings on the MII prevented the front suspension from fully drooping so I changed them back to soft rubber. EDIT: I have not used poly bushings for motor mounts, so I can't offer more than speculation. I would expect them to perform similar to rubber but with slightly more vibration and slightly less movement. Last edited by kalbert; 01-02-2013 at 11:26 AM. |
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#13 |
BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
I use polygraphite everywhere. Trans, motor, control arms and bushing. I can tell the difference right away from stock rubber. Power is put through faster and firmer through the drive train. I even upgraded my S15 Jimmy front a-arms to polygraphite. It feels better firmer around corners and curves. Any SUV should have polygraphite for control.
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#14 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Leave it to the CHEMIST to talk me into it. although I did not use the ploy graphite last time, I definately will this time. I will probably start with the Motor Mounts and tranny mount, and im sure sooner or later will also do the suspension and body... I did love the way my 85 handled and drove.
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#15 |
Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
I use poly on almost everything here, (4 or 5 cars that I can think of) and no complaints here. Even my wifes 2000 SS came with factory poly mounts on the front/rear sway bars.
On my 72 blazer I put poly mounts on engine/trans/body mounts/ and the leaf spring eye's front and rear as well as sway bars. Drives like a dream. Several others here I run poly mounts on that vary from front subframe mounts on unibody cars, to sway bars etc... Most of them come with grease fittings now, and some are also impregnated with graphite, so squeaks aren't much of an issue anymore, and relatively easy maintanance. Best part is that they will last the rest of my lifetime. Can't say the same for the chinese rubber you get nowadays. |
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#16 | |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Quote:
Auto manufactures use rubber cause its cheap and gives a good ride. Same with transmissions and thier soft shift and overlap. Grandma doesn't want snappy shifts even if it means her trans last longer. Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#17 | |
Registered User
Join Date: Sep 2010
Location: Marble Falls, TX
Posts: 1,575
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
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#18 | |
Registered User
Join Date: Jun 2012
Location: Minnesota
Posts: 509
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
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#19 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Well that's the first place I am starting, engine and transmission, WHEN IT WARMS UP, I live in South Texas and its COLD !!!! I hate the COLD. Guess I'm gonna have to learn Spanish, may have to relocate to Mexico, SOUTHERN MEXICO
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#20 |
Registered User
Join Date: Mar 2012
Location: Woodbury, Ct.
Posts: 1,680
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
South Texas is cold?? lol..6* this morning in Ct.
Poly cab mounts, didn't really notice a difference other then correcting the lean a little..Went with rubber on the motor and tranny...The console shakes so much it could shake a martini..But I think that that is because of the tires that the truck sat on for a few years while she was on the back burner. |
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#21 | |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Quote:
Then again as I think about it the vibrations may funnel down to the tail and such. Idk all three if mine are poly. The nice thing is the trans mount is blow proof so it can't separate like the old stock ones. I'm sure auto trans are easier on the bell housings than manual. If I crack my trans case Ile let you guys know but so far two years no issues. And it's a lopey sucker! Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#22 | |
Registered User
Join Date: Sep 2010
Location: Marble Falls, TX
Posts: 1,575
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
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Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9 |
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#23 | |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#24 | |
Registered User
Join Date: Sep 2010
Location: Marble Falls, TX
Posts: 1,575
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
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Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9 |
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#25 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Re: Poly MOTOR MOUNTS and TRANNY MOUNTS
Well went and bought them, Autozone had the morpotr mounts and Orielys had the transmission mount. All ENERGY SUSPENSION. I FIGURE THESE ARE JUST MOUNTS, NOTHING TO SQUEEK, so these are not the Poly Graphite one. When I get to the suspension and such, you bet they will be the Poly Graphite ones. Now just gotta get the ambition to do it (won't take much coaxing. But it is cold, but then again, I do have a garage and a heat lamp. The Cowboys are out of the Playoffs soooo I guess I have time on Sunday to do it ....
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2004 Silverado Crewcab (Dark Spiral Gray) |
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