ok i got a question for ya'll

[68GMC454]

now i got a 68 1/2 gmc....thats my new toy...
now i got a 84 3/4 gmc with a 454 in it...

now i know it will fit in the 68,,i do have a 400 turbo tranny i got out of a junk truck..it shoudl drop right in with new motor mounts right...or is it going to be a pain in the butt...do i need anything from the 84 other than the motor mount and the radiator....i am really strongly thinking on doing this..so any info would be apreciated....mainly im just ready to start driving the 68...and the 454 is the only motor i got laying around..but i will know in the next few days on wether i get this mid to late 70's chevy thats runs with a god 350 in it...but am still leaning this way..i can always put the 350n in my 3/4..lol
billy

[Aarons72s]

The radiator from the 84 wont fit, different radiators. Actually I have seen a couple of them in the newer trucks but they dont fit or look right. Just go to the local parts store and order a new 4 row radiator for a 67-72. Other than that I dont see any real problems. Oh by the way your 68 is an automatic truck right? Hope this helps.

[68GMC454]

yes it is an automatic..it has a 350 turbo in it ..or i think thats it...i got a radiator that came with it,,i will have to look at it,,,i really havent checked the truck out to much. seen it,,bought it,,trailered it home and put it in storage...thank for the info on the radiator...
billy

[Aarons72s]

You shouldnt have a problem with getting the th400 in there but you will need a different yoke and U joint. I dont know it they make a ujoint to work with a th400 yoke and th350/ powerglide/ 3spd drive shaft. You May want to ask this question on the engine and drive train forum. Hope this helps.

[Americanrider]

Ask Longhornman about Turbo 400's needing a tall hump floor.

[bryanw1968]

Originally Posted by Americanrider

Ask Longhornman about Turbo 400's needing a tall hump floor.

I think the turbo 400 does have to have the "high hump" floor.

[Americanrider]

I sold Longhornman a tall hump for his truck, without it he had about 1/2 inch of clearance between the tranny and floorpan. But he's also running a 500 cube caddy under the hood.

[68GMC454]

ok didnt know that..thanks for all the info...i might just run the turbo 350 for now.im not going to really do any heavey hauling with this truck..more or less a toy...
billy