jay_lt4

iTrader: (4)

someone make this a sticky

here are the facts about fitting an old style trans to the gen3 engines

1. the gm gen1,2 trans will bolt to the gen3 engines but you only use 5 bolts, the gen 3 engines do not use the middle bellhousing bolt on the pass side( no big deal)

2. you do not need a special flexplate, the curved 4.8,5.3,LS1- just need the t/c bolt holes ovaled out a bit and the 5.3 flex plates have a set of holes that match the small gm t/c bolt pattern perfect

- the 6.0 flat flex plate has the same t/c holes as the large gm pattern(th400 and most aftermarket th350 converters that have a dual t/c bolt pattern on them)

3. you need to use a crankshaft spacer when using a gen1,2 trans and converter there are 2 types:

- hughes gen3 crankshaft spacer part # hup-3795 $44 from summit/jegs, this spacer must be used with the curved 4.8,5.3,LS1 flexplates

- gm stock 6.0 crankshaft spacer 12563532 and longer bolts 12563533, this spacer can be used with either the flat or curved flexplate ( if using the curved style flexplate the flexplate goes on the crank first then the spacer goes on then the bolts, if using the flat 6.0 flexplate the spacer goes on the crankshaft first then the flexplate then the bolts)

i have used both style spacers, on several 5.3,LS1, 6.0 swaps and have not had any problems with either set up

monkey11

hey great job!! I've been looking for this, will help alot. +1 for making it a sticky. What about T/C, isn't the 700 and 4L60E t/c the same? and what about TV cables (bowtie overdrives) ??Pictures may help make this a sticky!!

DanZ28

iTrader: (5)

You also have the option to buy an LS1 converter built for a TH350/400 and not use any spacers at all. But it's good to see all the info in one place instead or reading through 10 pages of the sticky/FAQ above, so good write up .

Dan

jay_lt4

iTrader: (4)

how do you get something sticky'd,, there are more post's about this same topic on here all the time, this is the plain simple answer to all the ls1/th350,400 questions

Vcious04

iTrader: (16)

Good luck making this a sticky and using summit/jegs info/pricing..

Just leave the part # for the adapter. just my .02

6techniques

iTrader: (7)

Yeah, thats what I was thinking too...Its just the law of the land!

Very good info though, I def learned a bit!

chevydad

if i had access to all three types of flexplates (ls1,5.3,6.0) and was mating a th350 to a 01 6.0, which would be the better or easier flexplate to start with?

SatanzWS6

iTrader: (3)

great. all the info i needed. thanx man.

the_merv

iTrader: (88)

What Converters can you use though.. if you get a LT1 4L60E to go on a LS1, can you use the LT1 Convertor with the 5.3 Flexplate, and a Spacer?

jay_lt4

iTrader: (4)

you can use the lt1 4l60e converters and the hughes spacer and 5.3 curved flexplate

the_merv

iTrader: (88)

I didn't find anything on Summit, anyone found any kind of spacer anywhere?
I found this:
http://cgi.ebay.com/ebaymotors/ws/eB...3841193&rd=1,1

jay_lt4

iTrader: (4)

here is the hughes spacer from summit:

http://store.summitracing.com/partde...5&autoview=sku

Dirty 30

iTrader: (96)

TTT, Great info.

monkey11

What about if i go from a t-56 to a 700 R4, with a 2002 camaro? how do i correct the speed sensor?? i know yank sells the correct reloctor ring but can i correct it with a tune instead?? im not sure about this?

Dirty 30

iTrader: (96)

Just picked up spacer, pics...

Sweet71

iTrader: (10)

Good info im just about to do one

JeevesRules

iTrader: (1)

was doing a conversion myself and found this as one of the best laidout posts in the subject ... just a bump for those looking to save on the legwork

LS1MCSS

iTrader: (18)

I have the Hughes spacer ordered from Summit. It should be here tomorrow.

kill_machine85

iTrader: (4)

awesome knowledge

beefcake

this is very very helpful this should be a stick reguardless of the rules