Jegster Crossmember measurement

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565bbchevy

565bbchevy

Geezer
Aug 8, 2011
6,833
113
Michigan
Does anyone that has a Jegster transmission crossmember know what the measurement is between the centerline of the 2 exhaust humps? I have heard of fitment issues in this area and want to see if the measurement will match up to my headers.
This will be for a TH400 trans but I think this measurement will be the same for all of their Gbody crossmembers.
 
pagrunt

pagrunt

Comic Book Super Hero
Sep 14, 2014
4,801
113
Elderton, Pa
Can't give any measurements but I could give an idea of how close they could be. I sold my TH350 X-member to another member cause the ill-fated Pypes kit pipes are too wide for the humps. Now the back up Jegs exhaust kit came in narrower under the G-Force X-member. Being for the TH400, you should have enough space between the collectors & X-member to have pipes made to route under the humps. Their X-members are designed to be used with their exhaust kits (just a maketing thing) but you shouldn't have any issues getting to work with your headers.
 
ssn696

ssn696

Comic Book Super Hero
Supporting Member
Jul 19, 2009
3,960
113
New Mexico
Do a search under my handle, from perhaps last year (?). Here is a photo of the TH400/200-4R model. The tubing is 1-1/2" x 2", so eyeballing it, I'd say the humps are 7-7-1/2" from the mount center.
 

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Grand prix 80

Grand prix 80

Not-quite-so-new-guy
Aug 9, 2018
26
3
Not the best picture I know but the humps line up perfectly with my headers and had to dremel out holes a lil bit to get to bolt up in frame though. And I'm still in progress of my build
 

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565bbchevy

565bbchevy

Geezer
Aug 8, 2011
6,833
113
Michigan
I just crawled under the car...it looks closer to 7-1/2"
So 7-1/2" from the center mount hole to the center of the hump or the leading edge of the hump?
This would have been the perfect picture if your string was a tape measure.
 
ssn696

ssn696

Comic Book Super Hero
Supporting Member
Jul 19, 2009
3,960
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New Mexico
So 7-1/2" from the center mount hole to the center of the hump or the leading edge of the hump?
This would have been the perfect picture if your string was a tape measure.
Sadly, I agree, but for free ya git whatcha git. I was trying to figure out at the time why the driver's side hump hits the floorboard. I was ready to cut it apart and redo the driver's side hump for more clearance. For now, I have it bolted on UNDER the frame rail extension, so it at least holds up the transmission while the coupe patiently waits fo rmy future attention.
 
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