Gen IV BBC bolt in compatibility with GMT400 platform?

[L31MaxExpress]

Correct me if I'm wrong, but 99-00 6.0 had a "long" crankshaft in order to make current 480le from sbc,bbc fit. Transmissions from those don't have spacing issues when mated to bbc,sbc. 480le trans from other ls engines would have crank issues?

The newer LS had a spacer in place of the long crank.

 

[Metalgear454]

Well, once again thanks, for all the input, it's great to hear from like minded individuals who experience very similar conditions.
The good news I even own an old Turbo 400 short tail.

 

[unruhjonny]

Also note that 1500 trucks have a thinner frame than 8-lug trucks. Not a huge deal for a daily driver but you'll have to stick to the door panels tow ratings even with full 1-ton drivetrain.

Umm, the 454SS had five lugs.

I thought they shared the same frame with the regular 1500’s(?).

I believe the tow rating had to do with:
1-Engine torque
2-Drivetrain gearing

But who really gives a crap about tow ratings for a fun cruiser?

The guy wants to build a hot rod.

I thought that I read the small blocks used the same mounts as the big blocks - but I could be mistaken.

You could probably check replacement mounts on Rockauto to see is the V6 vs SB vs BB are in fact different.

 

[L31MaxExpress]

Umm, the 454SS had five lugs.

I thought they shared the same frame with the regular 1500’s(?).

I believe the tow rating had to do with:
1-Engine torque
2-Drivetrain gearing

But who really gives a crap about tow ratings for a fun cruiser?

The guy wants to build a hot rod.

I thought that I read the small blocks used the same mounts as the big blocks - but I could be mistaken.

You could probably check replacement mounts on Rockauto to see is the V6 vs SB vs BB are in fact different.

454SS had 5 lugs, but it had a TH400 or 4L80E and a beefy for the combination 9.5" SF 14-bolt rear. The front springs are also big block specific. I have a pair of the big block coil springs in my 99 Tahoe.

 

[Metalgear454]

Yes, Rock Auto is a great way to compare parts for certain level / configurations. Thanks!