TH400 swap, Whats involved

[highboostgn]

So I've decided to go with a TH400. I know I will need a new converter, trans cooler, and to modify the driveshaft, but what else is involved with this swap?

Thanks,

Donnie

 

[kidglok]

So I've decided to go with a TH400. I know I will need a new converter, trans cooler, and to modify the driveshaft, but what else is involved with this swap?

Thanks,

Donnie

I'm pretty sure you will need a new shifter as well, if its a rmvb

 

[GNcollectables]

shifter linkage issues (for n/s switch, etc.), crossmember, check exhaust clearance, speedo gears, prepare for higher RPM's when driving...

 

[SSedan64]

The 2004R Crossmember should work, 2004R & 400 rear mount are in the same location.
http://www.maliburacing.com/transmission_swaps.html
http://www.maliburacing.com/auto_tranny_id.htm
3-Speed Shifter & Cable, shorten DS & swap to 32-spline Slip Yoke, Converter.
I think there's a Thread with all the swap Info on TB.com site.

 

[SSedan64]

2004R Crossmember will work, Mount needs to be changed, Shifter Detent Gate, Shifter Cable & Bracket, Vacuum Modulator with a Checkvalve or TransGo #VBP-VAC, Torque Converter.

http://www.turbobuick.com/forums/threads/installing-turbo-400.342742/#post-2755534
http://transgoonline.com/products.p...d=259&countdisplay=6&start=0&addcountview=Yes
http://www.gbodyparts.com/product_i...d=588&osCsid=e70176fcb3016c3aac24970bdb04d888

 

[jasjamz]

Order the HRPartsnstuff conversion mount.
A dipstick tube and locking dipstick for a TH350 or the Newer 400 dipstick with the grommet instead of the o-ring seal.
Change the yoke on the driveshaft.
Remove the Detent Cable.
Bent the trans lines a little and they will work.
Same shifter cable. Park, reverse, neutral, and drive are in the same spots. No issue there.
G Body parts has the th400 detent bracket for a RMVB.
Converter same as a 350 if you find a deal on one.
Better have the line pressure/ pump mod done too.

 

[highboostgn]

thanks for the info guys!

 

[ULOSE2A6]

Not to hijack thread, but I was curious about a car with column shift. Is it possible to switch to the 400 and still maintain the column shift? Thanks.

Shev

 

[jasjamz]

Not to hijack thread, but I was curious about a car with column shift. Is it possible to switch to the 400 and still maintain the column shift? Thanks.

Shev

Yes, the dash gear indicator will be off after OD. Other than that no issues.

 

[highboostgn]

Order the HRPartsnstuff conversion mount.
A dipstick tube and locking dipstick for a TH350 or the Newer 400 dipstick with the grommet instead of the o-ring seal.
Change the yoke on the driveshaft.
Remove the Detent Cable.
Bent the trans lines a little and they will work.
Same shifter cable. Park, reverse, neutral, and drive are in the same spots. No issue there.
G Body parts has the th400 detent bracket for a RMVB.
Converter same as a 350 if you find a deal on one.
Better have the line pressure/ pump mod done too.

What's the the line pressure/ pump mod ?

 

[SSedan64]

Pr. Mod Info can be found here, on Pg. 5 I think >> http://www.turbobuick.com/forums/threads/th400-build-pictures.255286/page-5
http://www.turbobuick.com/forums/threads/th400-build-pictures.255286/