I_wanna_gofast_ss

Alright just picked up a 2003 silverado v6 2wd truck what do i need to do get the trans to work with my ls1

jomomma

iTrader: (39)

is the pcm your using from a truck or an fbody? was it an auto or a m6? what trans does the truck have?

I_wanna_gofast_ss

the truck has whatever trans came with the v6 in 2003 the pcm and wiring will be from a truck

jomomma

iTrader: (39)

if the truck has an auto in it then most likely its a 4l60. in that case, you wont have to do anything other than bolt them together.

gofastwclass

iTrader: (2)

^^^ I don't believe that is correct sir.

The V6 trucks use the Gen I style transmission / block spacing so you will need the adapter from GMPP and 6 new longer flexplate bolts. Your LS1 PCM will control the transmission just the same as a V8 model - if it was an auto car and came with the wiring / programming.

I_wanna_gofast_ss

So the v6 transmission will work with the ls1 if i use the spacer can i use the ls1 convertor or what convertor would i use

jomomma

iTrader: (39)

if the trans is a 4l60, he should be fine. im not sure about the convertor or flexplate. i was refering to the transmission.

gofastwclass

iTrader: (2)

All 4.3 V6 engines use the Gen I / II architecture and thus have the incorrect depth at the crank flange in relation to the back of the block where the bell housing bolts to. The difference is .400" and GM makes an adapter just for this situation. This also means the torque converter and transmission need to stay together and you would use a Gen III dished flexplate with the adapter behind it. I've been told without this adapter you will destroy the front pump of the transmission in a matter of minutes or miles, but I can't verify that. I'm sure Vince @ FLT could give you the lowdown on that last bit. For the price of the adapter and proper bolts from GMPP, the $65 is worth not having to take the transmission out - regardless of why.

The adapter.




Installed.



Now here is where things get tricky because there always seems to be an exception... Certain early 6.0 liter engines (I believe only the iron head ones, but can't verify) have a longer crank that protrudes from the back of the block like the Gen I / II engines and thus does not need the adapter. These engines also don't use a dished flywheel and are easy to spot since the crank flange is not flush with the back of the block. I've seen pictures but never seen one in person.

I_wanna_gofast_ss

Ok so i think i understand all that i have an ls1 out of a 2002 camaro i have been building and i sold my nova for double what i paid because that where it was suppose to be going into but i picked up this truck for cheap so thought about maybe a budget ss silverado do you know what engines used the dished flexplate or is this an aftermarket part

jomomma

iTrader: (39)

if he were to install a ls1 or any ls convertor and flexplate onto the 4l60, i think he would be ok. because he is running an ls1.

gofastwclass

iTrader: (2)

These pictures are from my latest daily driver / project car (see sig).

Pictured is the factory flexplate for the Gen III (LS) series engines with the standard crank flange. Your Camaro engine would have this if it was an Automatic car. The truck will have a flat flexplate and you will need the V8 Camaro (or V8 truck) flexplate and the adapter and bolts I mentioned. I can give you the PN for the bolts if you are interested, you will need six.