2500 6.0 to GMT400 4l60e

[Stepside_fever95]

Will i need a different flexplate to install my lq4 from a 2002 sierra 2500 hd that originally had a 4l80e behind it to my 1999 Suburban's 4l60e torque converter?

 

[ryeguy2006a]

I believe the flywheel is the same, but you will need the crank spacer that came on the 99-00 6.0's with the iron heads.

 

[Stepside_fever95]

I though the 99-00 had a longer crankshaft with no spacer? I'm hoping the bolt hole pattern for the torque converter is the same.

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[jdla140]

https://ls1tech.com/forums/automati...xplates-converters-transmissions-spacers.html

Bolt pattern is different. If your engine has a flexplate on it already, then it already has a spacer. You could get a dished 4.8/5.3 flexplate and bolt your spacer on the back side, but it's hard to center the spacer up on the back side of the flexplate. FWIW, I've never come across a single 99-00 5.3 that didn't have both the larger (11.066") and smaller (10.75") 60e pattern holes on the flexplate. I bolted a 98 blazer 4l60e (10.75" bolt pattern) behind a 99 5.3 using the stock flexplate, and one of these:

https://www.amazon.com/Michigan-Mot...ocphy=9020931&hvtargid=pla-624525186687&psc=1

It all worked very well, probably the cheapest method as well.

 

[Z71Hobbs]

I realize it’s not my wallet, but I think you’re gonna regret running a 60e behind that lq4.

 

[Stepside_fever95]

I realize it’s not my wallet, but I think you’re gonna regret running a 60e behind that lq4.

I know, the 60e will be temporary. I'll be saving up to buy a 4l80e soon.

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