Joe_G

^^ Justin I appreciate your input - I'm having my shop check my plate to make sure it's holding up after a few months' use...if not we'll reinforce it!

Thanks for chiming in.

Joe_G

Update = my shop checked my plate, it's 1/4" aluminum and is holding up great so far.

They played around with using a PFadt C5 rear mount on my C6...it looks like it would really spread the load on the cradle well, not just on the aluminum plate. It would need some machining to work as it's too tall but not impossible to do. We just didn't bother with it at this time.

Mike@hpsflorida took some pics, let me see if I can get him to post up.

Here's the Pfadt C5 mount.



http://www.pfadtracing.com/catalog/p...roducts_id/100

Joe_G

Here are some pics of my cradle, my adaptor mount, and how a Pfadt mount looks. I think the Pfadt mount could pretty easily be nodded to work. If I was starting from scratch I think I would use it.

Sparo2

Hey Joe,

Now that's something to think about there. When I was fabing the mount I came up with an idea of designing a mount like the PFADT C5 mount for my C5 to C6 conversion but didn't give it to much thought at the time. I just wanted to get my car done. I was going to use something similar and use simple bump stops on the ends.

I've been drawing up specs and scetches for the past week but probably won't start fabing till I start adding more power to the car. I think the current mount it fine for now. I just finished my buddys car with a slightly redesigned mount, just a little wider. He loves it. I should've taken pics.

0Mike@hpsflorida

I am pretty sure i have found a way to make this work, but i just need to get my hands on another pfdat mount.

Res1cue

Back from the grave. Sparo update us on this.

Sparo2

I have a design down on paper but I haven't gotten around to actually building it. For the past months I've been having issues with my clutch which involved me having to tear the whole drivetrain out 3 times. So I've been pretty busy.

I should have something for you guys to look at within a month or so...if the car holds together. LOL. Actually I'll be ordering gears within the next few wks so the diff will be out and that's when I'll get to work on the mount.

The most problematic part will be clearance between the bottom of the diff and the cradle. There isn't a lot of room down there so fitting a mount like the PFADT is going to be challenging...BUT NO IMPOSSIBLE.

So far the "prototype diff mount I have is holding up just fine but there's a lot of room for improvements. I'm also working on a "bolt-in" mount that will not require welding a plate to the cradle....for those that don't have that option.

Res1cue

I can't remember but did you say that a 04 C5 diff will bolt to a 05 MN6 transmission with no other mods to the transmission?

anthonybalmert

Wanting to confirm this as well....

Sparo2

The C5 diff will bolt right up. My diff came from a 01 and it bolted up directly to my 05 MN6 with no modification at all. No need to change any tail housings or anything.

Joe_G

My buddy is putting a Pfadt rear mount on his C5...here's a pic of the standard C5 rear mount compared to the Pfadt.

The c6 conversion mount is similar to the C5 mount, but is quite a bit shorter. Thus, (and I'm guessing here) to use the pfadt mount, you'd need to cut that center U-channel part down by around an inch, and perhaps trim about an inch off the rubber snubbers on the Pfadt.

If you think about it, the small c5 center mount, combined with the torque tube and the engine mounts (see the Pfadt engine mounts in the picture also) cause the drivetrain to be essentially a tripod. The Pfadt rear mount "gives it legs" and allows the twisting forces to be spread to the sides of the rear cradle. As we have to weld a plate to our cradle in the C6 to C5 rear conversion, this Pfadt mount would take the stress off that aluminum plate we welded in.

Anyone who's ever had the misfortune to use a tripod engine stand knows, a 4 legged stand is much better (and safer).

Sparo you ready to mod these up? Keep track of your adjustments, I would like to put one of these on my car.

ragtopws6

The 05 C6 are the only year that the C5 diff will bolt to (05 essentially has a C5 MM6). I have used a 05 trans into a 2000 FRC without issues.

debo

This is good information to know. At least they did something good for us 05 C6 owners. So I can use the 01-04 C5/Z06 Diff without any modification issues, is that correct? If that's the case, once I start modding heavy, I'll start planning to save for this purchase.

kh400

Will it also bolt up to a c-6 with an automatic?

Sparo2

I don't see a reason why it shouldn't but I don't want to give you any bad info. Hopefully someone will chim in. I'm 95% sure though, just not 100% sure.

LS1LT1

I know of at least one 2005 automatic C6 (with heads & cam) that has had the C5 rear conversion done and it's been holding up very well.

ragtopws6

The 06 and up auto's have 30 splined output shafts. It won't work unless you have the pinion gear resplined.

ALVETTE00

Novel idea for sure!

But as a welder I want to say...your welds suffer from porosity which is caused by atmospheric contamination due to improper shielding gas. Porosity degrades the strength of the weld and can lead to failure.