turbo69ss

I got a 2000' trans am, engine went bad because a coolant leak in the coolant tank, so i went and got a 2000' 6.0l truck motor with very low mile to swap over. I have swap every thing from the aluminum motor to the 6.0l motor, include heads, oil pan, all front acc. and the whole intake assemly. Then i try to put it back into the car and find out the the motor and trans(auto) won't mate to each other completely and i got about 1 inch gap. It seem like the crankshaft on the 6.0l is longer than the one on the aluminum block. Anybody out there that have done the swap can help me to go around this problem????????????????????

1dirtyZ

iTrader: (1)

i think gm sells a flex plate spacer that bolts to the crank , or you could get a flexplate made specifically for that (or was it a torque converter made specifically for that) , i was told the same thing when i used the iron block on my car.

maybe some one will chime in and help you more.
try posting this in the transmission section.

vortec_7

iTrader: (2)

I always heard that the crankshafts were the same dimensonally...Never had one side by side though. Are you sure it's not something else? Those dowel pins are a real pain sometimes.

Speartech

iTrader: (14)

Ouch!!

You have been bitten by the "early 6.0L crank syndrome".

Lots of guys ran into that a few years ago when they were building high power setups using the iron 6.0. The 99-00 6.0's have a crankshaft that is 1/2 inch longer than all other Gen-3 engines. It's because in the beginning they were only mated to 4L80E transmissions, and this difference was needed to properly locate the 4L80E torque converter.

Later, when the 6.0 was mated to the 4L60E they redesigned the crank to be like all the other Gen 3 engines. Now when the 6.0 is used with a 4L80E, it gets the crank spacer kit.

Unfortunately you have the crank spacer that CAN'T be removed (since it was cast that way).

I don't know of an easy solution (maybe a custom torque converter that is 1/2" shorter?).

It's one of the various issues that makes the 99-00 6.0L (iron head version) less desirable.

Here's the difference in the cranks (2000 crank on the left):

haphazard6

i was just wondering what else about the 99-00 6.0l was less desirable?(considering i just got one for super cheap) I was planning on doing a 4" stroker kit, aluminum heads(newer 6.0l) and then mating it to a t-56 and throw it in my 1968 camaro.

Speartech

iTrader: (14)

I don't think you'll have any problems if you're just using the block!

The issues were the iron heads, the odd ball crankshaft, and lots of piston slap complaints.

haphazard6

thanks for the info

turbo69ss

I Also Have A Short Block(6.0l) Off A 03' Truck, Will This Short Block Bolt Right Up To The Trans????

12secSS

iTrader: (30)

Why not, if possible, just swap the LS1 crank into the 6.0L engine. They interchange without a problem.

Speartech

iTrader: (14)

Yes, that will work. If the engine came from a 4L80E application, REMOVE the crank spacer, and be sure and use a dished flexplate (LS1 or any 4L60E Gen 3 flexplate), NOT the flat 6.0L flexplate.