Crossmember for DSE Sub and Holley specific parts?
 

Is anyone running these specific parts in a first gen?


Trying to figure out which Holley Trans crossmember works with these parts-


1. DSE sub, LS3/T56 magnum
2. 60404 mounts
3. Holley headers for DSE sub
4. Holley exhaust for DSE sub and quadralink.


I tried using the Holley crossmember (for the stock subframe) and it doesn’t align and one of the T56 case tabs interferes with it. Holley doesn’t make a crossmember for the LS conversion with a DSE sub....

I have a DSE sub and I’m using the hooker black heart. Lsx427 and t56 magnum.

Will, which crossmember are you using? The Holley 12626 one (their standard first gen LS one)?

Honestly i'd have to go back and look, it was when that cross member first came out and installed probably back in 2016-ish timeframe. I've had it out and back in several times since then with no issues.

I will say i did have to slightly oblong the holes on the mount to fit, but it was less than 1/4". I'll take a look later to see if i can get pics.

And this is with the DSE setback mounts on their frame as well.

Maybe an obvious question/scenario, but have you looked at your mount to see if it has offset mounting? I'm using a mount with two bolts through the crossmember, and cant remember if they're centered or not, but i dont believe they are.

I’m using the same setup but with DSE headers and DSE setback motor mounts and I picked up a Bowler crossmember and it works great. I was in their shop for something else and they happened to have one that the powder coating was chipped on so I picked it up at a discount expecting to have to mod it. At the time they said it was for a BBC with T56 but there was no wrapping or part number on it. Only thing I had to do was oblong the holes and it fits perfectly.

Appreciate the replies. I will be heading to see the car on Friday to get more specifics on what is going on with my car. I don’t mind elongating holes, I am just curious on what the driveline angle is also in this configuration. Will update more then.

I will try and check and see what my angles are as well next time i get it on a lift. I did use the shim provided with the trans crossmember (1/2" ish) to space the tail shaft UP.

Update-

I was able to go work in the car on Thursday. Fitting everything together as I had it, the driveline angle was approx 5.2 degrees down. That included the Holley supplied spacer (for the magnum). We started raising (and mocking in different spacers) the trans level. Ended up going to the local hardware store and bought a 1” square block of aluminum. Thanks Scott D'Alessandro!
We installed(mocked it in) that spacer and it was right at 3 degrees, closer to where I wanted to be. The contact area on the case I was concerned about is no longer a factor.

Obviously the block will have to be drilled and the mount studs will be swapped for longer bolts.

I plan on trying to raise the trans level a bit more, I know the 3 is good, I really want closer to 2 degrees. I will update more once it is in the car. The trans tunnel will have to be cut/raised. The subframe holes will also need to modified to match the new crossmember location.

my friend has almost your identical set-up (DSE sub, 060404 mounts, LSA engine, Quicktime bellhousing, T56 Magnum-F) and used the Holley trans crossmember (71222017HKR) meant for the "LT" generation engine swap and it worked fine with no tran tunnel cutting/mods.

what exactly is hitting on your set-up? not sure what my friend did differently but it all seems to fit (albeit very tightly). he does have DSE aluminum body mounts but they're stock height.