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#1060569 - 01/30/19 03:34 AM Transmission swap  
Joined: Jan 2019
Posts: 2
JYD Offline
New Member
JYD  Offline
New Member

Joined: Jan 2019
Posts: 2
Victoria, British Columbia
Hello everyone,
I have recently been given a 1986 Monte with no motor and transmission.
I am intalling a gen 1 small block and have a 700r4 trans to install. Can anyone tell me what modifications I will need to do with the trans cross member?
Thank you.


JYD
#1060573 - 01/31/19 05:30 AM Re: Transmission swap [Re: JYD]  
Joined: Jan 2000
Posts: 4,382
mmc427ss Offline
15+ Year
mmc427ss  Offline
15+ Year
Member

Joined: Jan 2000
Posts: 4,382
Pottstown, Pa
Here's an old post from years ago that may be some help.
http://www.montecarloss.com/community/ubbthreads.php?ubb=showflat&Number=762415&page=1
Bob

#1060695 - 02/09/19 04:45 PM Re: Transmission swap [Re: JYD]  
Joined: Jan 2019
Posts: 2
JYD Offline
New Member
JYD  Offline
New Member

Joined: Jan 2019
Posts: 2
Victoria, British Columbia
Thanks Bob,

So this is what we did to the cross member to make it fit.. First of all we opened up the slot for the trans mount so we could slide it in place, to make the cross member fit level. We also had to remove about 1/4 inch of materal off of the left side of the cross member then installed the two bolts loose on the right hand side. then took a hole saw and drilled two new mounting holes on the left hand side of the frame rail.


My next obsicale is the speedo drive housing and drive shaft, which I have leads on both for soulutions.

As I continue to surpass these obsicales I will continue adding what I found to get the job completedand on the road.


JYD
#1060712 - 02/11/19 05:00 AM Re: Transmission swap [Re: JYD]  
Joined: Jan 2000
Posts: 4,382
mmc427ss Offline
15+ Year
mmc427ss  Offline
15+ Year
Member

Joined: Jan 2000
Posts: 4,382
Pottstown, Pa
As for the crossmember with any trans swap you try to get the tailhousing as high as possible. The engine/trans angle generally runs in the area of 3 1/4-1/2 degrees for most stock installs, sloping rearward. this is why the engine intake manifold has same angle front to rear.
Often the mistake is made when doing a trans swap to a trans not original to the chassis to just stick it in there. Mostly because some of these new trans are larger than the stock trans and require surgery on the tunnel to get them installed high enough into the tunnel to get that engine /trams angle.


What speedometer are you using, and is the donor trans an electronic speedo? This site may help with that problem.
Bob


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