midnightmoonlight Posted March 18, 2007 Share Posted March 18, 2007 I just finished installing my differential with the RT bracket and poly gm mount. I sandwiched the diff between the stock mount and the poly mount. Everything lined up fine with the stock motor, trany, drive shaft, ect. I used a r160 lsd but this setup will work with the r180 as well. If the r200 is 3" tall at the nose that should work too. Thought someone would like to know it does in fact work. Quote Link to comment Share on other sites More sharing options...
Roostmonkey Posted March 19, 2007 Share Posted March 19, 2007 I for one am very glad to hear it works. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted March 19, 2007 Share Posted March 19, 2007 I can't wait to get R/T mount in the mail. I konw I should do a search but what GM P/N is used for the actual motor mount? Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted March 19, 2007 Share Posted March 19, 2007 You want the energy suspension unit http://www.jegs.com/webapp/wcs/stores/servlet/productitem_10001_10002_743960_-1_12694 They also have one in red (JEGS part number 355-3-1108R ) Quote Link to comment Share on other sites More sharing options...
midnightmoonlight Posted March 20, 2007 Author Share Posted March 20, 2007 Thats the gm mount I used. While using this mount I noticed the top piece with the threaded holes is only attached to the poly. It doesnt seem to me that this would last long with a differential hanging from it in a v8 swap when only using the gm mount. This mount isn't designed to hang. I know alot of people are running this setup but I would like to hear the longevity of that way. I would be more inclined to use a sandwiching method for any aplication so the diff isn't hanging from the mount. The only thing holding it is the bond between the poly and that metal piece at the top. Once you get the driveshaft angle right wouldnt it make sense to put something under the diff so its not hanging? Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted March 20, 2007 Share Posted March 20, 2007 The metal top and bottom pieces interlock inside the poly http://energysuspension.com/pages/univ3.html If you go to Pete Paraska's web site, the original I guess user of this diff mount, he mentions he used a stock GM unit that quickly destroyed itself. But he has been using the energy suspension piece ever since. Quote Link to comment Share on other sites More sharing options...
midnightmoonlight Posted March 21, 2007 Author Share Posted March 21, 2007 I thought so but the picture wasnt very clear Quote Link to comment Share on other sites More sharing options...
Forrest Posted April 11, 2007 Share Posted April 11, 2007 Could someone please post the GM part number? I checked all the old threads and the links are broken. I would like to try the rubber mount. Quote Link to comment Share on other sites More sharing options...
fastzcars Posted April 12, 2007 Share Posted April 12, 2007 http://energysuspension.com/pages/mt_tr1.html Heres the link to the mount. the one you want is #3.1108 . Quote Link to comment Share on other sites More sharing options...
Forrest Posted April 12, 2007 Share Posted April 12, 2007 Thanks, but I was referring to the part number for the rubber OEM mount. Quote Link to comment Share on other sites More sharing options...
fastzcars Posted April 12, 2007 Share Posted April 12, 2007 Forrest Thanks, but I was referring to the part number for the rubber OEM mount. If you use the stock GM part on the RT mount, it won't hold. Pete P already tried it! Pop N Wood The metal top and bottom pieces interlock inside the poly http://energysuspension.com/pages/univ3.html If you go to Pete Paraska's web site, the original I guess user of this diff mount, he mentions he used a stock GM unit that quickly destroyed itself. But he has been using the energy suspension piece ever since. Quote Link to comment Share on other sites More sharing options...
Forrest Posted April 13, 2007 Share Posted April 13, 2007 Yes, I read that. However, I happen to know many people who are using the rubber mount with 0 problems and less noise. This may be because they are not in Pete's car, or it may be because they're using the stock mount on the bottom. Unfortunately (for me) they didn't need the part number because they are lucky enough to live where at least some of the people who work at auto parts stores that aren't robots. Here, if you don't have a part number, you don't get the part. So. Does anyone have the part number? Quote Link to comment Share on other sites More sharing options...
Zmanco Posted April 13, 2007 Share Posted April 13, 2007 I've been watching this thread with a lot of interest as I'm getting ready to install the bracket soon myself. But I'm confused by the concern that the GM mount is going to be torn apart. The picture in my head is that the GM mount goes between the top of the nose of the diff and the R/T bracket. The stock diff mount is also installed to support the nose of the diff from beneath it. If this is correct, then the GM mount would only be under compression during acceleration, correct? How could this tear up the mount? What am I missing here? Signed, confused in Colorado Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted April 13, 2007 Share Posted April 13, 2007 The diff will twist from engine torque. The mustache bar contains the movement in the rear while the front is stopped from twisting by the front diff mount. So the upper mount is not only compressed but heavily twisted. On decel it wil be pullled down and twisted in the opposite direction. Hard to believe both the upper and lower mounts are needed. But if you know people who have both then I guess the fact it is more quiet is good to know. If you can't ask someone who has the GM mount ( ), then I would suggest looking up the ES unit on summitracing.com and checking their cross referenced list of vehicles the unit fits. http://store.summitracing.com/partdetail.asp?part=ENS%2D3%2D1108G&view=32&N=700+ So go to Autozone and order a trans mount for a 1968 El Camino with a 307, or one of of the other 2 dozen vehicles on the list. Quote Link to comment Share on other sites More sharing options...
Zmanco Posted April 13, 2007 Share Posted April 13, 2007 http://www.partsamerica.com/productdetail.aspx?MfrCode=ANH&MfrPartNumber=2378&PartType=38&PTSet=A As popnwood said, it's for a 68 el camino with 307. $2.39! Quote Link to comment Share on other sites More sharing options...
fastzcars Posted April 13, 2007 Share Posted April 13, 2007 Zmanco I've been watching this thread with a lot of interest as I'm getting ready to install the bracket soon myself. But I'm confused by the concern that the GM mount is going to be torn apart. The picture in my head is that the GM mount goes between the top of the nose of the diff and the R/T bracket. The stock diff mount is also installed to support the nose of the diff from beneath it. If this is correct, then the GM mount would only be under compression during acceleration, correct? How could this tear up the mount? What am I missing here? Signed, confused in Colorado Heres Pete's web page explaining the reason for the design of the RT mount. http://alteredz.com/drivelinemods.htm Quote Link to comment Share on other sites More sharing options...
midnightmoonlight Posted April 14, 2007 Author Share Posted April 14, 2007 Sandwiching the diff between the two mounts makes for less movement and isn't noisy at all. I have an LSD thats supposed to be louder than the non lsd and I dont notice much difference at all. Sandwiching only works with the stock 6 set up. I have 0 sound deadening material in my car right now too. I used the poly mount because its stiffer. When I ordered the part they couldnt look it up by the part number I had to give them the application. I just told them it was a GM tranny mount and got the right item although I had the part number to double check. Quote Link to comment Share on other sites More sharing options...
heavy85 Posted April 15, 2007 Share Posted April 15, 2007 I've been watching this thread with a lot of interest as I'm getting ready to install the bracket soon myself. But I'm confused by the concern that the GM mount is going to be torn apart. The picture in my head is that the GM mount goes between the top of the nose of the diff and the R/T bracket. The stock diff mount is also installed to support the nose of the diff from beneath it. If this is correct, then the GM mount would only be under compression during acceleration, correct? How could this tear up the mount? What am I missing here? Signed, confused in Colorado I think most are running with ONLY the top mount and ditch the stock mount therefore the diff is hanging by the top mount ... which was designed by the factory to be used with weight on top of it not hanging underneath it ... which is why it is getting torn apart .... and since the Energy mount is interlocking does not get torn apart. Some have left the stock mount in place hence the 'sandwich' but the design intent is no sandwich. Cameron Quote Link to comment Share on other sites More sharing options...
zgeezer Posted April 15, 2007 Share Posted April 15, 2007 You have a few choices. For me, I chose to use the RT mount with aftermarket Engergy mount and retained the stock cross member that held original differential nose mount and located the lower control arms. I'm using this set up only because, while I understand the poly mount is interlocked, I feel more comfortable knowing the differential nose drop will be limited in the event of a failure. The other is I consider the crossmember mount to be additional bracing to the driveshaft tunnel. The RT mount is a work of art. Hated to paint it. g I think most are running with ONLY the top mount and ditch the stock mount therefore the diff is hanging by the top mount ... which was designed by the factory to be used with weight on top of it not hanging underneath it ... which is why it is getting torn apart .... and since the Energy mount is interlocking does not get torn apart. Some have left the stock mount in place hence the 'sandwich' but the design intent is no sandwich. Cameron Quote Link to comment Share on other sites More sharing options...
Roostmonkey Posted April 15, 2007 Share Posted April 15, 2007 Wow, a work of art. Cool Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.