With the competition engineering aluminum body bushing kit, you get 6 bushings to go in place of 12 stock pieces. On which side of the subframe do the solid bushings go? Are you supposed to use rubber bushings on the bottom? Im confused...

 

I just went through the same thing and here is what I ended up doing. You put the solid mounts between the body and frame (kind of a no brainer since that is the only place that it would actually flex any way) and reused the stock rubber lower parts.

 

If you buy the body mount kit from Detroit Speed (www.detroitspeed.com) or Globalwest (www.globalwest.net) you get all the bushings and the hardware.

 

I ended up making a duplicate set to go on the bottom. Their advice to use the old mounts for the bottom only works if you have decent mounts coming off (I did not). Not quite solid if the bottom can flex!!!

 

The aluminum goes between the subframe and body (duh) and I just got some shorter grade 8 bolts and large grade 8 washers and cinched it down. The washers will hit the subframe and hold it tight.
CoryM

 

Sweet. the big washer idea sounds good, so does making the replica ones on the bottom. I put in new rubber bushings on the bottom....but the instructions aren't specific and I didn't know if it would work or what. What do you torque them down to? When I torqued down the rubber, it started to push out...

 

I torqued mine to 130ft/lbs with red locktite. 130 is the standard torque for a grade 8 5/8" fastener and it felt like the right torque as well. I dont see any point in making a aluminum bushing on the bottom.... any reason for doing that? Way I see it the comp bushing centres itself, and using a bushing requires a longer bolt which is weaker.
CoryM

 

Placing the bushings on the bottom was done to use the length fasteners I had. The large opening in the frame would concern me with just a washer unless the washer was at least 1/4" thick. (I'm afraid it would bend) If I had both the thick washer and short bolts I'd do it that way too.

 

using the aluminum between the body and frame and rubber between the bolt and frame is going to cause the alumium bushing to grind into the body and make a nice round hole in your floor over a period of time.

You are supposed to just use the alumium mount between the body and frame, then either get shorter bolts or get more/make more mounts.

using rubber at the bottom defeats the purpose of solid mounts, your body wouldnt move down but it would move up, lots of bashing of the floor panels if you think about it.

also when using alumium body mounts you should use a set of subframe connectors to keep body twist down or you can "potato chip" the floor panels (where they bend in the middle and crack severely) like mine did.

This keeps the body and frame from moving at all and makes the mounts work like they are supposed to.. not move.