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Old 05-30-2019, 10:43 PM   #1
Texas240
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Default softer 240 V8 STS mounts

Has anyone found a replacement in a softer rubber or poly than what sts offers in their mounts? I made a good amount of difference going with a higher stall converter in my 4l60e but there mounts and the poly that is offered still translates a good amount of vibration at idle through the the car. Even worse with a/c on.
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Old 05-30-2019, 11:19 PM   #2
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perhaps ask STS?
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Old 05-30-2019, 11:20 PM   #3
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perhaps ask STS?
His response 3 years ago was, we buy in bulk and they won't sale a softer mount to you.
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Old 05-30-2019, 11:24 PM   #4
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His response 3 years ago was, we buy in bulk and they won't sell a softer mount to you.
Damn, thought they would at least tell you if it was an interchange to some common part.

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Poly rubber bushings are made by energy suspension
call them up, but I'm thinking getting it out to examine is not easy
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Old 05-30-2019, 11:59 PM   #5
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I’m doing an LS swap right now in a 240....going with 1989 Corvette clam type and they bolt to the LS swap mount plates
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Old 05-31-2019, 07:39 AM   #6
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See if Scott will at least give you the dimensions/model # of what's in there -- then you can shop around on your own for replacements. I made my mounts out of the rear upper torque arms - and lucked out when I ordered the poly bushings for mine. FWIW, they were a black poly. They seem softer compared to the blue and red poly bits used in other places on the car. Use an OEM rubber tranny mount with some modifications to keep it from moving around as much. Smooth/quiet - and with the 3rd torque mount on the driver's side head -- virtually no movement under torque/decel.
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Old 05-31-2019, 11:58 AM   #7
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what cam do you have? also are you sure the converter is seated properly? my 6.0 with a stock cam was smoother then any redblock ive ever owned with the sts mounts installed. I had vibrations in mine at first and it ended up being a messed up flex plate
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Old 05-31-2019, 09:17 PM   #8
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what cam do you have? also are you sure the converter is seated properly? my 6.0 with a stock cam was smoother then any redblock ive ever owned with the sts mounts installed. I had vibrations in mine at first and it ended up being a messed up flex plate
Stock truck cam. Its been like this from that start off getting the engine/trans out of a wrecked avalanche. Was never taken apart. The vibration has since settled a little with the new circle d 2800 stall converter but is pretty harsh with the ac on. In park or neutral the engine super smooth. I put a can of beer on my intake manifold cover I made and it doesn't move.

Flex plate looks fine.
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Old 06-01-2019, 01:00 PM   #9
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Stock truck cam. Its been like this from that start off getting the engine/trans out of a wrecked avalanche. Was never taken apart. The vibration has since settled a little with the new circle d 2800 stall converter but is pretty harsh with the ac on. In park or neutral the engine super smooth. I put a can of beer on my intake manifold cover I made and it doesn't move.

Flex plate looks fine.
Do a tune up, sounds like you got a miss
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Old 06-01-2019, 05:37 PM   #10
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Do a tune up, sounds like you got a miss
nope. Maybe 8K miles on plugs, wire, coils. 2-3k on fresh oil change. Drove the car today. Vibration at idle didn't seem as bad as before.
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Old 06-02-2019, 04:15 PM   #11
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Where was the truck hit?
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Old 06-02-2019, 08:50 PM   #12
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Where was the truck hit?
I honestly dont remember. That was 4 years ago when I went to the salvage yard. They had the engine out already. I did see the truck when I had them grab the pedal. I think front end. What are you thinking.
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Old 06-03-2019, 11:25 PM   #13
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I honestly dont remember. That was 4 years ago when I went to the salvage yard. They had the engine out already. I did see the truck when I had them grab the pedal. I think front end. What are you thinking.
Hard front end collisions can cause issues with the crank being unbalanced, all depends where it was hit etc etc. Just throwing out ideas.
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Old 06-03-2019, 11:28 PM   #14
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Hard front end collisions can cause issues with the crank being unbalanced, all depends where it was hit etc etc. Just throwing out ideas.
who knows. I vaguely remember seeing side impact.
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Old 06-04-2019, 12:00 AM   #15
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who knows. I vaguely remember seeing side impact.
Our 4.8 spun a center thrust bearing for not reason, the truck was a front impact collision. We drove it for about 10k miles before the bearing spun
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Old 06-04-2019, 12:00 AM   #16
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the crankshaft on my original 5.3 i swapped in was all kinds of ****ed up and bent. shattered the oil pump
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Old 06-05-2019, 11:32 AM   #17
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Our 4.8 spun a center thrust bearing for not reason, the truck was a front impact collision. We drove it for about 10k miles before the bearing spun
We'll see what happens in another 3-4k miles.
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Old 06-10-2019, 07:31 PM   #18
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Raise the idle speed a little.
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Old 07-11-2019, 08:35 PM   #19
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Shout out to Bret Willet for getting me into Dallas Performance the Lambo shop for a quick change to the tune. Like a few other people said, raise the idle which I wasn't disagreeing with just talking to a few tuners that only work with LS motors that these engines dont need to idle above 650 were clearly wrong. Raising the idle up 150rpm from 650 to 800 cleared the vibration at idle up and solved an idle drop when the ac is on when coming to a complete stop. Rpms would drop to 300 or so then pick right back up. Car now also chirps the tires when up shifting thanks to some torque management.

Hope to get onto their dyno in a few months or for my birthday as a gift to myself. The lambp shop is so zen when you walk in there.
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Old 07-12-2019, 02:15 PM   #20
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Old 07-14-2019, 10:25 PM   #21
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Car now also chirps the tires when up shifting thanks to some torque management.

Tune all that crap out! Woke my car right up for sure.
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Old 07-14-2019, 10:45 PM   #22
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Tune all that crap out! Woke my car right up for sure.
Once we get back to the dyno I'm sure it'll be even better. The initial dyno we did a few years ago was just power.
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Old 07-23-2019, 06:18 PM   #23
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That Boy Brett Doin Work down at Dallas Performance!
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Old 07-24-2019, 09:27 AM   #24
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Quite a few texas guys in here. I'm in Houston. Sold my v8. Looking for a wagon to swap now. Not going well.
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