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Old 04-28-2013, 05:05 PM
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4L60E Trans Swap

Hello.Can anyone tell me what i will have to do to put a 4L60e tranny out of a 1999 c-1500 into a 1998 c-1500.I am having trouble with the torque converter bolting up to my 98 flywheel.Can anyone Help Please.

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Old 04-28-2013, 07:54 PM
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Originally Posted by my73beepbeep View Post
Hello.Can anyone tell me what i will have to do to put a 4L60e tranny out of a 1999 c-1500 into a 1998 c-1500.I am having trouble with the torque converter bolting up to my 98 flywheel.Can anyone Help Please.
Is 1998 truck engine a 5.7 liter engine?

Did the 1999 truck have a 4.8 or 5.3 liter LS series engine?

Or are these V6 engines?

Sounds like you have a later design 4L60E trans , trying to bolt it to earlier design engine. It does not work. Converter, bell housing, pump , input shaft are different in the later design trans that was bolted to a LS based V8 engine
Dont worry how old you are... it is the mileage on your body that adds up.
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Old 04-30-2013, 07:43 AM
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Cut and paste from one of MY posts from another forum, in yoru case refer to the bolded, underlined and italicized section.

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx
If you want to install a GEN 3/4 engine in a 96-99 truck you can use the existing 4l60e by using this flexplate spacer

EDIT(FEB 2013) Here are the current p/n for

12563532 flexplate to crank spacer $41.06 LS1 Flexplate Spacer 12563532
19260102 flexplate $79.68 FLYWHEEL ASM (W/RING GEAR) 19260102
19257940 bolts $5.28(need 6 bolts) LS1 Flexplate Spacer Bolt 12563533 19257940

If you want to keep your 305 or 350 but have a more modern 4l60e/65e/70e that was behind a 4.8,5.3,6.0 or 6.2L engine then you need this kit.
Transmission Adapter Kit 19154766

This flexplate adapter from HUGHES will allow you to use an older 4l60e behind a GEN 3/4 engine as well.

I find this interesting, because now I can install a 4l65e from a 2006 2wd SS Silverado into my 1997 2wd rcsb. The electronics are the same in all the 4l60e transmissions. The 4l70e has the TCM inside its case.

EDIT April 2013:
More p/n's for Auto Transmissions

GMPP flexplate spacer 12563532 Scoggin-Dickey $40.81
GM flexplate for spacer 12551367 Scoggin-Dickey 113.00
GM metric flexplate bolts (6) 12553332 Scoggin-Dickey 2.52 ea.
GM LS1 Engine Kit Install Guide 88959384 Scoggin-Dickey 9.95
Hughes SFI flexplate, 168-tooth HP4004 Summit Racing 129.95
Hughes crankshaft adapter HP3795 Summit Racing 43.95
TCI Gen III/IV flexplate w/ext. 399753 Scoggin-Dickey 192.95
TCI Gen III/IV pilot extension 399753PE Summit Racing 29.69

And now for the Manual Transmissions:

Scoggin-Dickey clutch bracket SDCB Scoggin-Dickey $59.95
Keisler LS1 bellhousing call Keisler Engineering $239.95
Quick Time bellhousing 27011 Speedway Motors $374.99
McLeod flywheel 460535 Summit Racing $417.99
McLeod disc, 11-inch, 26-spline 260571 Summit Racing $225.99
McLeod pressure plate, 11-inch 360803 Summit Racing $194.99
McLeod clutch fork 16931 Summit Racing $60.69
McLeod adjustable ball stud 16908 Summit Racing $54.39
McLeod stock throwout bearing 16010 Summit Racing $63.69
McLeod adjustable throwout bearing 16505 Summit Racing $93.99
McLeod adapter pilot bushing 8617 Summit Racing $37.69
GM Gen III/IV flywheel 12561680 Scoggin-Dickey $299.60
GM metric pressure plate bolts (6) 12561465 Scoggin-Dickey $0.56 ea.
GM LS2/LS7 pilot bearing 12557583 Scoggin-Dickey $13.62
GM ball stud, short 3729000 Scoggin-Dickey $10.60
GM ball stud, long 3790556 Scoggin-Dickey $11.66
ARP metric flywheel bolts 330-2802 Summit Racing $26.95
ARP metric flexplate bolts 244-2901 Summit Racing $26.99
ARP metric pressure plate bolts 134-2201 Summit Racing $17.88
ARP metric bellhousing bolts 762-1004 Summit Racing $28.69
Throwout fork boot 178N Year One $11.30

Here are some torque specs that are needed. As well as crankshaft style(1 piece or 2 piece) and the bolt circle diameter

(ft-lb, unless specified)
Flywheel bolts
15 (1st pass)
37 (2nd pass)
74 (final pass)

Bellhousing bolts
Pressure plate bolts, ARP

BOLT CIRCLE (inches)

Gen I '55 to '86

Gen I '87 to current

Gen III/IV '97 to current

Engine and Transmission Swap Gen III - Car Craft Magazine
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxx

I agree with Crosley, your 1998 truck should have a 3 piece 60e with the 360 bolt on bellhousing, main case, and bolt on extension housing.

We need the info about what engine your truck has, and if if the donor truck was a 4.3 or 4.8/5.3?

The newer transmissions use a torque converter that measures 300mm, while the older trans uses a 298mm TC. The output shafts are differnt lengths between teh 2 transmissions as well.


Last edited by Hogg; 04-30-2013 at 08:10 AM.
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Old 04-30-2013, 08:19 AM
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This pic shows the differnce in length between the bellhousing mount face and the bellhousing/engine interface bewteen the GEn 1 and GEN 3 engines.

I have a 1999 4l60e from a 1999 fullsize truck with a 4.3 V6. The TC bolted right up to my Vortec 350 flexplate, although the bellhousing is open at teh bottom because the 1998+ 4l60e's all use a bolt on 360 bellhousing while the 1997 and older trucks all used the 2 piece 4l60e with teh bolt on sheetmetal inspection cover like the old 700r4/th 350 transmissions. You will not have this issue. As your truck already has the 3 piece trans. Your interchange issue is merely due to the differences between GEN 1 and GEN 3 engines.

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