Once you get that tied into the x member looks like it should hold up fine. I got my crossmember from bmr a few weeks ago and theres no way they sent me the right one, even after I sent them a pic they claim that its correct. The trans mount is almost even with the rear mounting holes. Looks like one maybe for a 400, but I think the 80e is way too long for this.

 

I didn't know BMR made a X-member for a 4L80E swap in our cars. I saw them for the 4th gens but thats it. The trans mount sits quite a ways back on this trans, just use my pics as a reference.

EDIT:

I just looked at thier cross member...it might work. The pics are a little misleading, but I think those 2 slots/bolt hols line up with the rear most frame holes. This must be a new addition to thier product line, they didn't have it when I started building mine. You will need to figure out your torque arm mount and driveshaft loop if you're running one. I like mine better...LOL!

 

The problem is that the member they sent me doesnt even match the one on their site, but they claim its a new design and they havent updated their site yet. But I really dont see this working. Making a mount for the torque arm shouldnt be a problem, or ill just make a separate crossmember for it.

 

Post up a pic, I am curious on what it looks like.

 

DAMNIT! I just ordered the BMR 4L80 x-member last week and now I find out it isn't worth a crap. ARRGGHH!

 

I can't confirm that it works or doesn't. When you get it post up some pics and let me know if it fits or not. Obviously you will need to figure out something for the torque arm with their crossmember, but it might bolt up to the trans and frame rails.

 

Im not sure if its going to fit or not, doesnt look like mine will. I will post a pic tonight for jonarotz to get his opinion.

 

I plan on running a tunnel-mounted Torque arm so I am not so concerned about that but I am more concerned with fitment of this part, now that a possible issue has been brought up.

It may be a couple of weeks till I get the trans to do a test fit but I can snap some pics.

 

Ive considered doing a tunnel mount and just being done with it but i dont think thats a very good way to mount it if your making alot of power, plus i've heard they make a lot of noise.

 

I am not a big fan of a tunnel mount either. But what I am going to do is run a cross member between my sub frame connectors. Basiclly like the BMR torque arm.

 

When I said "tunnel mount" TA, I meant crossmember mounted similar to what grover85 is talking about. My bad.

 

sorry this took so long but heres a pic of my crossmember.

 

You're right that does look different, but I think it might just work. It is a little hard to tell but you will find out when you bolt everything up. The have the trans mount perch haning off the back of the tube where as I put it on the inside of the hoop. It worked better for me to do it that way for the torque arm.

 

Well I got the trans in and there is not doubt that they sent me the wrong one, its about 2 inches too short. I think it might be one for a 400, and if thats the case I might just get a torque arm relocation x member for a 400 and make it work because it would be easy to get this one to work if I had to.

 

That sucks. Can you return it and get them to send you the right one?

 

I hope so, i saved the emails from a few month ago when I asked them about it. Im still kicking around different ideas on how to mount the torque arm. Take a look at this spohn peice that mounts to the tunnel on a 4th gen. I just so happen to have a 98 camaro roller laying around that I have no problem cutting into to get the mounts. What do you think? I know bmr makes a trak pak but I dont really care for it.
http://www.spohn.net/shop/1998-2002-...ersY-Pipe.html

 

Disregard my post above, I dont know why im making this more complicated than it actually is. I need to just do like you did and make a mount on the x member and reinforce it in the rear.

 

My x-member came and that's the one I got as well. What is it exactly that makes this "not fit"? Not bolting up to the chassis?

*EDIT* NOW I see the problem (Looked on BMR website). It won't work. The part that bolts to the trans is WRONG.

 

This is why it wont work for me. I talked to bmr and they were very good to deal with but couldnt really explain why it was so far off. Not sure its because its an ls swap or because im also using spohn conversion motor mounts. But it was nt a big deal I just welded a mounting pad farther back.

 

Allow me to Illustrate.....

("you" in the text means BMR)

 

Damn, where'd you get those pics? Maybe I should get back with them and make them send me a new one. Although I do like the 400 one better bacuse im mounting the torque arm to it and the center tube is farther forward for more support.

 

I got the pics from summit. I forwarded the pics to BMR but I have not heard anything yet.

 

I see you installed the plate. I installed a few on mine. (decided to pull the t56 and fix a bad bushing and seal. along with a roll pin and shift fork pad) well they are in I never welded mine up yet which is why the bolts are still in there. once I tighten them I will drill some holes to tack weld them in. I used one of the forward holes that was right inline with the t56 mount and then the far back hole for some extra support where the tq arm goes



as posted before they are 3/8" thick and threaded 10mm holes. the size of the plates are just a bit too big you can see the rear bolt is on a angle because its hitting the rear part of the subframe but once I tighten it down it will level out and I will tack weld it in. I figure large plates are putting the load over a larger area. Im just not a fan of the way all the mounts hange over with no support.


I will continue my mount to lay flat against the frame all the way down to these holes like the front part does

 

I spoke with BMR and they said that the 4L80 cross member they are sending now (The one I received originally) is a new design.

As for fitting it to the car, they said there are three sets of holes on the frame and the member uses the rear 2 sets, not the front 2 like stock. I am going to test that when I pull my motor/trans out in the next while.

 

i wish i would have seen this earlier. i got a crossmember from bmr and it doesnt fit either

 

Yea theyre a bunch of idiots there, they really have no explanation why their crossmember is a mile off.

 

That's pretty bad. How the hell did they develop this thing...I mean its a thirdgen with a 4L80E...pretty straight forward.

 

According to BMR they based the cross-member on an 83 third-gen camaro.

 

Is there that much difference in the trans mount bolt holes from 83 to 91? I never knew...

 

i can bolt the crossmember to the car but it hits the back of the trans pan and there would be no way to get a mount in place. if i bolt the x-member to the trans it doesnt line up with any holes in the car.

 

My crossmember hit the pan too but I was able to massage the tube to get some clearance, by the time I was done with getting this crossmember to work I could have just made my own. Im surprised they used an 83 to design this, I thought they changed some of the underbody around 84.

 

I looked on BMR's site and in the description of the 4L80E mount they sell, they state that its for 84-92 f-bodies. Maybe they changed something....

 

i got mine about 9 days ago,unless they changed something since then it doesnt fit.my car is a 1992 camaro and came with a 305/t5.im installing a vortec 454 and 4l80e on the stock motor mounts but im pretty sure my engine isnt setting too far back. regardless im calling them monday for a explanation and ill post up what they say.
.

 

Being that I have an '82 I just happen to know what the trans crossmember difference is. In 82-83.5ish these cars came with a th200c transmission which is a 3 speed and is shorter than the 700r4. The mount shown below fits 82-92 since it has 6 holes for mounting to the body. 82-83's use the front 4 holes while 84-92's use the rear 4 holes.

 

BMR told me that I should use the rear 4 holes instead of the front 4, but when I looked at my stock x-member, its already using those holes. I wasn't sure if that was right or not. I have a 91Z28 305 w/ 700R4 going to a 383 w/4L80E.

 

i called them today.im sending them some pics if i can get my camera to cooperate.i thought i posted some on here but i guess i did it wrong lol.they are very polite.they told me to use the rear holes also but mine doesnt have any holes further back.ill post up what they say tomorrow

 

alright guys they told my wife they are working on the problem and will email me when they figure something out.

 

Did you receive my last e-mail regarding a couple of questions I had?

Thanks,
Lee Spicher

 

the email got sent to my spam, sorry bout that. .i wanted to be able to pull the pan without unbolting the crossmember so we scooted the crossmember back far enough to clear the pan then drilled new holes .if i move the crossmember further back the angles of the angle iron on the crossmember would be too far off so we extended the trans mounting pad.im not trying to knock your company or your products. the x-member was well built but didnt fit right. im not asking for anything free or my money back.just letting you know there is a problem. i was actually surprised when i called and didnt get treated like a 2 yr old.thanks.

 

I don't know if you fella's seen but I did this same swap in my bird a couple years ago. I made my own mount too.

TA I used jegs adj. tunnel mount, works great and if you are making "big power" you are going to need a cage anyways, just run bars from the main hoop diaginally to the tunnel. Plenty of strength this is built really heavy duty...

If you are building a "road race" car, would be the only real reason to pass on the tunnel mount arm. Longer arms help braking events...

 

Did you receive it yet?

 

OK I understand the pictures a little better now...

I am working on getting a 3rd gen car back in the shop so I can test fit these to find out where the issue is. The only thing I have been able to do up till now is verify the transmission mount placement by referencing off of a known alternative transmission say a 700r-4 for example and add on the additional length for the 4L-80 (we know these dimension because we offer the cross members for the 4th gens also). The confusing part is the measurements are telling me it's correct but it isn't working on the cars....

 

I received it about a month ago. Almost ready to test fit it to car.

 

What dipstick did you end up using on this swap?

 

I bought a new GM piece from the dealer. It was for a truck application, but I would just go with a Lokar piece. It took a lot of modifying to get it to work.

 

Im just not sure if I should go with the bellhousing mount or a firewall mount.

 

I would go with a firewall mount, the bellhousing mounted ones look short.

 

I took the car for a quick ride yesterday and I must say I love this transmission. It shifted awesome...night and day from the old 60E. I recommend that Trans Go kit.

 

Any luck with the BMR mount?

 

TTT

Earth to ANYONE...