GN diff and transmission into 81 Olds

[corkatoa]

Plot thickens, confusion mounts, I am deep into so many threads that have no definitive answers. Will continue searching but so far nothing really that discusses how to deal with the lock up.
Am I missing some thread? I know it can be wired to operate in OD only and deactivate with the brakes but is it necessary to even do?

 

[lilbowtie]

Bolt pattern on transmission.

 

[corkatoa]

Bolt pattern on transmission.

SBC, but doesn't 200-4r fit all?

 

[pontiacgp]

the driveshaft is 1" shorter as well, I didn't see that mentioned

 

[383_GrandPrix]

SBC, but doesn't 200-4r fit all?

The GN is powered by a Buick 3.8 so your 200-4r will have a BOP (Buick Olds Pontiac) bell housing and won't fit the Chevy bolt pattern. Although I have heard of dual pattern bell housings so you may get lucky.

 

[84GP455]

The lockup for the GN has a die stamp "D5" or "5" all on the side of the converter. And you can buy a lockup kit for it, I got this one and it works great.
https://www.jegs.com/p/TCI/TCI-200-...MI5-P126ON4gIVjx-tBh2yNAYMEAAYASAAEgLJBPD_BwE

 

[383_GrandPrix]

Chev on the left BOP on the right

 

[84GP455]

GN D5 lockup converter

 

[oldsmobile joe]

View attachment 113110
Chev on the left BOP on the right

are those suppose to be 200-4r transmission's or just representations of chevy and bop?
the reason i ask is i've had 4 200-4r transmission's and all were multi fit bell housings. i have never seen a chevy only 200-4r. but everyone says they exist.

 

[hoffa65]

spend the 250 on a g-force member for an 81, its true dual exhaust member so if you put any kind of HP motor in it later you will want duels anyway.

get a aftermarket lockup wiring kit from CK performance or Bowtie overdrives, locking to TC it will make the trans run cooler and give better MPG in cruse

make sure you use the drive shaft for the GN, its an inch shorter the your stock shaft