<<<Replacement for Top Hat transmission mount>>>

[Darius]

I'm having a buddy of mine build a prototype transmission mount to replace the flimsy Top Hat RB25 mount that allows the drive train to bounce around like a kid on crack. I am looking for some input on the transmission isolator.

1) What are the purposes of a transmission isolator besides vibration dampening to the body? I was thinking about designing the mount to bolt directly to the transmission after the stock isolator is removed.

2) Is anyone else interested in one of these if I have several made? It would be for the RB25. I have no idea what it will cost at this point, but I want to feel out the level of interest.

[l0nestar]

After reading the title, I was assuming using some Flexane and casting your own with US Grade 8 hardware. Not the most beautiful option, but would work well.

Other than isolating the vibration, it is used to hold up the transmission / rear of the engine. Not sure what else to tell you!

Sorry if those were not the answers you were looking for. :-\

[Darius]

I considered that as an option for the OEM isolator, but anyone can fill theirs if they feel the need. I am also looking for a cleaner option but haven't found anything that fits the application yet.

I did some searching on some drag racing sites and a lot of racers frown on solid transmission mounts because they put too much stress on the transmission housing causing them to crack. A lot of guys also said that solid mounts should only be used in conjunction with a mid-transmission mount and a rigid frame car (race chassis).

Therefore, I'm leaning towards sticking with the OEM isolator filled with Flexane for simlpicity. I can always find a better urethane isolator solution down the line. For now, I just need to take the slop out of the transmission mount.

[Shocker]

I feel a design like Macks solid mount is a great start. However I would have welded a stud into the mount sticking up. For the solid puck I'd have some rubber/poly material on the base and top of the mount. Maybe 1/8" thick to suck up a few vibrations.

[Darius]

The mount design will be complete today so it should be fabricated next week for test fitting. I'm also getting in touch with a company to make an isolator that matches the RB25 isolator but for a high hp application. I will keep everyone up to speed and hopefully be able to add pics next week!!

[sepulchralx]

So the tophat transmission mount gives those problems to everybody? Is it because the metal is so damn thin?

[Darius]

Right on! Trying to hold a 500+lb engine and transmission still under hard acceleration and braking cannot be done with the wimpy 1/8" steel plate on the TopHat mount. A stiff suspension makes it even worse.

[SullivanRacing06]

i love for a mount to replace the crappy transmission mount! soild plz! i made a pair of cnc motor mount inserts and am looking to make or make a deal for a transmission mount! let me know [email protected]

[Darius]

I will e-mail you tomorrow and see what you had in mind.