Jegster Crossmember measurement

565bbchevy

565bbchevy

Geezer
Aug 8, 2011
5,517
2,240
113
Michigan
#1
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.
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pagrunt

pagrunt

Comic Book Super Hero
Sep 14, 2014
2,616
1,384
113
Shelocta, Pa
#2
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
Jul 19, 2009
3,075
1,010
113
New Mexico
#3
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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ssn696

ssn696

Comic Book Super Hero
Jul 19, 2009
3,075
1,010
113
New Mexico
#4
I just crawled under the car...it looks closer to 7-1/2"
 
Grand prix 80

Grand prix 80

Not-quite-so-new-guy
Aug 9, 2018
21
10
3
#5
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
5,517
2,240
113
Michigan
#6
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.
dscn5814-jpg.94650
 
ssn696

ssn696

Comic Book Super Hero
Jul 19, 2009
3,075
1,010
113
New Mexico
#7
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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