Silver Sleeper

iTrader: (7)

i have searched and just want to double verify that the 6.0 flexplate with the spacer will in fact work with my 4.8 to TH400 swap...correct?


http://www.ebay.com/itm/New-OEM-Flyw...ht_2093wt_1185

Silver Sleeper

iTrader: (7)

Anyone?

the_merv

iTrader: (88)

Yup...

S10xGN

iTrader: (11)

I don't recall if the 4.8 has the +0.400" "long" crank or the short. That kit will work on the short face crank (which is much more common), the short crank is almost flush with the rear cover. Don't forget, you'll need longer bolts too.

Silver Sleeper

iTrader: (7)

thanks for the info!! i will double check my crank before i place the order

Bo185

Just note the spacer faces the crank when using the flat flex plate.

the_merv

iTrader: (88)

Early 4.8 has the longer crank.

Silver Sleeper

iTrader: (7)

i have a 99 4.8

Bo185

Look and see if you have the thick flange. It will stick out about almost 1/2'' from rear cover. If so then you will not need the spacer or longer bolts. Just place the flat flex plate on and elongate the TC holes in the flex plate.
The 4.8L standard transmission crank (1225312) is wide/thick. The 4.8L automatic transmission crank (12553482) is a narrow. The wide/narrow crank scenario happened in ’99-’00; after that they all became narrow flange.

the_merv

iTrader: (88)

4.8 with a 4L80E has long flange.

tta656

iTrader: (5)

you guys are confusing the **** out of me....


i have a 2005 5.3 silverado motor and using a 4l60e...do i need a spacer



sorry to highjack

S10xGN

iTrader: (11)

Short crank = flush with rear cover, needs spacer.
Long crank = 0.400" out of rear cover, no spacer.

Silver Sleeper

iTrader: (7)

im confused as well so i took pictures of my 4.8 with the stock flexplate still installed....from the pictures i took, it looks as if the the crank sits flush with the rear main seal...does this mean i need a spacer?

Bo185

Negative, the 4.8L 99-00 had the long flange with the NV3500 manual. The 4.8L was never used with the 4l80e till 2002 or so full size vans at that point it used the short flange and a spacer.

Bo185

That looks like a dished flex plate. You need the spacer after that flex plate to support the verter hub of the Gen I/II trans.

Silver Sleeper

iTrader: (7)

so do i buy the flat flexplate and spacer or do i use my dished flex plate and spacer?

ive searched and could never get a definitive answer on the 4.8

Bo185

I gave you the definitive answer. You have the dished flex plate. Your 4.8L was used infront of a 4l60e.

All you need to do is buy the spacer or even just the Hughes bushing it is cheaper and rides on the crank flange no need to even un-bolt the dished flex plate, but you still have to elongate and the holes in the flex plate were the verter bolts up. Read the link in my SIG!!!

Silver Sleeper

iTrader: (7)

thank you very much!! you just saved me a few bucks...im just going to buy the hughes spacer and run it..

as far as the flexplate mounting holes go...how much should i open the holes up?

Bo185

I would remove the flex plate and use the hughes spacer as a guide to align the flex plate to the converter. Mark and elongate the holes, then reinstall flex plate, use lock tight and torque bolts. Then using RTV or even superglue to temp hold the spacer into the end of the crank till you bolt up the trans and converter.

the_merv

iTrader: (88)

Ah ok..seen a long 4.8 one time, was told it had an auto behind it..