4l60e Install help?

slonlow2000

Member
May 13, 2015
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Heres my situation, lost 2/4/reverse in my trans several weeks ago. Fianlly got the stupid thing out after following a how to over on pt.net. Now is there a how to for installing? I had to buy new torque converter to flywheel bolts due to mine having a allen head center only. Do those bolts have a torque sequence or steps to tighten them down to a certain torque? And what about the bellhousing bolts? Do they have a toqrue they need to be at?



 

a-fuso

GMC Owner
Mar 28, 2012
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Not really, Just snug them down with an impact, all the bolts are going into steel too. I had to remove the starter and use an shallow socket with a swivel and the impact to get my tq bolts back in.
 

Cleanoh4

Well-Known Member
Aug 27, 2013
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There is ALWAYS torque specs

LS1Howto.com

That should list everything you need
But heres the cliff notes

Flywheel to Torque Converter Bolt 46 ft lb
Transmission to Engine Bolt 35 ft lb


EDIT: A dab or two of blue loctite probably wouldn't hurt either

EDIT 2: You also may want to back it off maybe 10% if reusing bolts
 
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slonlow2000

Member
May 13, 2015
154
7
18
Thanks guys! I'm getting new tq converter bolts due to the 99's having the allen head only bolts. The bellhousing bolts I am reusing though.
 

slonlow2000

Member
May 13, 2015
154
7
18
Yeah they sure as hell are not going back in. Went to GM and ordered 3 of them. They redesigned them and they still have a allen head center, but a 15mm bolt head around it. They come with some sort of loctite on them already.
 

a-fuso

GMC Owner
Mar 28, 2012
1,856
74
48
CA
A torque wrench and torque specs sound good, but how you have to use extensions and such to reach all the bellhousing bolts makes a torque wrench impossible to use, I just installed my trans a few weeks ago and used an electric 3/8 impact for everything, set on the middle power setting.
 

slonlow2000

Member
May 13, 2015
154
7
18
I was more concerned with the torque converter bolts. Didn't want to screw those up. The bell housing bolts will more than likely just get tightened.
 

slonlow2000

Member
May 13, 2015
154
7
18
While I have a couple of you responding, the shop have me a can of trans cooler and line flush to run though does it matter which line I run it through?

And ewhat kind of fluid do I need to be running in this? its a 99 4l60e