4L80E Swap
#51
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
Well I messed with the support strut tonight. I got done what I can at home...unfortunately my welder here at home isn't up to the task of tacking this thick material in place. I will have to get it on a lift and weld the other bracket to the main X-member tube. I basically did what was mentioned earlier in this thread.
#52
Re: 4L80E Swap
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!
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!
Last edited by jonarotz; 01-24-2011 at 10:05 PM.
#53
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
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!
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!
#55
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Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: stock
Re: 4L80E Swap
DAMNIT! I just ordered the BMR 4L80 x-member last week and now I find out it isn't worth a crap. ARRGGHH!
#56
Re: 4L80E Swap
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.
#58
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Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: stock
Re: 4L80E Swap
It may be a couple of weeks till I get the trans to do a test fit but I can snap some pics.
#59
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
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.
#60
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Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: 4L80E Swap
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.
#61
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Car: 1991 Camaro Z28
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Re: 4L80E Swap
#63
Re: 4L80E Swap
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.
#64
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
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.
#66
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
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
http://www.spohn.net/shop/1998-2002-...ersY-Pipe.html
#67
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
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.
#68
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Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: stock
Re: 4L80E Swap
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.
Last edited by RoadHammer; 03-01-2011 at 07:40 PM.
#69
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
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.
#71
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
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.
#72
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Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: Auto
Axle/Gears: stock
Re: 4L80E Swap
I got the pics from summit. I forwarded the pics to BMR but I have not heard anything yet.
#73
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Re: 4L80E Swap
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
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
Last edited by 88 350 tpi formula; 03-07-2011 at 10:05 PM.
#74
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Car: 1991 Camaro Z28
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Transmission: Auto
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Re: 4L80E Swap
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.
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.
#78
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Car: 1991 Camaro Z28
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#79
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Re: 4L80E Swap
Is there that much difference in the trans mount bolt holes from 83 to 91? I never knew...
#80
Re: 4L80E Swap
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.
#81
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Car: 91 Z28
Engine: 6.0 LSX Single turbo
Transmission: 4l80E
Axle/Gears: Moser 9" 3.55
Re: 4L80E Swap
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.
#82
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Re: 4L80E Swap
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....
#83
Re: 4L80E Swap
.
#84
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Car: 82 Z28
Engine: TT LS
Transmission: 4L80E
Axle/Gears: S60 3.54's
Re: 4L80E Swap
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.
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Car: 1991 Camaro Z28
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Transmission: Auto
Axle/Gears: stock
Re: 4L80E Swap
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.
Last edited by RoadHammer; 03-28-2011 at 02:39 PM.
#86
Re: 4L80E Swap
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
#88
#89
Re: 4L80E Swap
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.
#90
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Car: 1987 Formula 350
Engine: 6.0 boost and smak
Transmission: 4l80e
Axle/Gears: 9bolt 3.27
Re: 4L80E Swap
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...
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...
#91
Senior Member
Re: 4L80E Swap
#92
Re: 4L80E Swap
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 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....
#93
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Car: 1991 Camaro Z28
Engine: 305 TPI
Transmission: Auto
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#99
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#100
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Re: 4L80E Swap
TTT
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