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Old 06-26-2019, 02:47 PM
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Default Pypes X Crossover w G-Force 4L80E Crossmember

Looking at the AUG 2019 Hemming Muscle Machines issue, they go over the installation of a Pypes 64-72 A-body 2.5" X system in a Chevelle with a crate 427 LS 625hp engine, and a 4L85E.

This build, uses a G-Force conversion crossmember for a 4L80E, and during the exhaust installation, they discovered the crossmember hangs too low to install the X crossover, and ended up installing an H instead.

Anyone have any further information regarding? I'm almost at the exhaust portion of my build, have the G-Force crossmember, and concerned I may run into similar issues.

Any feedback would be greatly appreciated!

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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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  #2  
Old 08-22-2019, 06:08 PM
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Old thread I just saw. but I used a G force to put the TH400 in the IA/Camaro. Just installed the X past that so I can drop tranny anyway. The Pypes 3.5 though did have short legs for the front to the X and long in the rear so had to cut and weld to do it. Did the Dr Gas X on the 78 TA the same way.

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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Old 08-22-2019, 09:32 PM
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If I'd have known, I would have steered you away from that G Force deal. Too late now that you have it I guess.

But I use these X-Factor cross members for these swaps. They are infinitely adjustable as you can see in the picture. That's a Pypes X system on the car and there is no need for any exhaust monkey business with these cross members so the X can be placed closer to the engine where it's most effective. They have copious amounts of room for exhaust and made of aluminum so very light weight. You'll pay for it though, about $375, worth every penny.
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Old 08-23-2019, 08:18 AM
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Well, didn't get much response and wanted to move forward, so I ordered a Hooker conversion one. The instructions said that it was ment to be used with the LS engine mounts, and was for an LS conversion, but I took a shot to see if it would work.

Nada. The arch was not as drastic, and no way could it be moved back far enough to use with the 4L80E. Eh, I tried.

I did see the X-factor ones, but didn't try it. Yes, that looks like a ton of room, wish I would have found that earlier. I went ahead and put the G-Force back in for now, not sure if I'm going to try to swap it out or not. I plan on roughly mounting the exhaust in place and driving it up to a custom shop, but if it would clear/mock up, I will order the x-factor.

Here's a pice comparison of the Hooker Blackheart one & the G-Force. You can see it's not steep enough of an offset.

Shame, the Hooker piece is nice, strong design, and much lighter than the G-Force. I bet that X-Factor one is lighter though.

EDIT: I will get under there in the next weekend or so and hold the X pipe up there, snap a pic. I get where the issue would be, the spread of the pipe on the X that pass through the channels. I will measure that too and post more info.

.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
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Old 08-23-2019, 10:07 AM
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Sorry bout that Highway. I've been limiting my time on here and not posting as much anymore. Kind of tired of the drama queens and stupidness going around, so I just didn't see this post. Wish I saw it sooner.

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Old 08-23-2019, 10:38 AM
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Yep G Force is a heavy one!
But having the crossover long legs further back was really no big deal, and I can drop the trans straight down without unhooking exhaust.

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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Old 08-23-2019, 12:54 PM
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I get it, I'm starting to slowly spend less and less time here, time, projects, work, life in general, all making me re-evaluate where I spend some of my time. I like helping folks though, in the hobby, and enjoy sharing ideas/solutions/experiences.

I would like to drop the trans out without removing the exhaust, but that's never going to happen with a 4L80E. It's just longer, and more cumbersome. The pan is wide. The gear selector bracket is very close to the header collector, so much so I will have to bend it some to fit. I dunno, maybe it would come out without removing/dropping the front pipes.



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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
  #8  
Old 08-23-2019, 02:34 PM
455'73inElCamino 455'73inElCamino is offline
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I know my setup is not the same as yours, but just as a reminder I have a 1966 el camino that has a Pontiac 400 & 2004r. From what I can determine, the frames are the same as the Pontiac. The engine mount holes are also pre-drilled to hold the Pontiac engine mounts.

Exhaust is 2.5" diameter.

I did not find that I could use an x-pipe at all because their just was not clearance for the drive shaft. I ended up having to use an h-pipe, but had to doctor the pipe on the top side to provide adequate clearance. My drive shaft is 3.5" diameter and I do not recall the yoke sizes, etc. The "stock" drive shaft would have cleared "I think".

In summary, I did buy cross members (and returned them) because I found that they were not the factor that created the problem in using the X or H pipe crossover. The help to use a larger exhaust pipe, but do not help solve the cross over pipe (X or H) at all.

Also, to set pinion angles can be another factor that can create problems.

I just didn't want to have my exhaust hanging too low.

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Old 08-24-2019, 10:01 AM
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On my 78 I have flanges on each end of the X also so if needed I can drop it out. Muffler guy was supposed to do that on the Camaro but forgot the ones by the mufflers. TA also has a flange on each end of the 3.5-3" reducer to drop it out to go open headers when I had an H pipe.H pipe was flanged in the middle if it needed ot be separated as it was right behind crossmember-and had tabs bolted to the old convertor bracket to hold up the system if I did go open headers. Car ran as fast with teh X as open headers so did not worry really about that option on the X.

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
  #10  
Old 11-20-2019, 10:16 AM
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To loop back to this, I installed the Pypes 2.5 X-pipe kit for headers and with the G-force crossmember, have no issues.

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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
  #11  
Old 11-21-2019, 04:51 PM
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I recently found an issue with the G Force in the IA/Camaro. Even though the X is behind trans you can not drop the crossmember out(legs too long) unless you drop the exhaust. And my exhaust guy had forgotten to put a flange back at the mufflers to drop the X easier,even though I asked him too.

http://forums.maxperformanceinc.com/...d.php?t=835600

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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