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Prepare Engine and Install Flex Plate

2:07
8:06
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At 2:07 in

From Old to LS Power: 6.0 Swap in My 1977 Jeep J20 (Part 1)

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What happens here

The narrator shows the 6.0L LS engine (estimated 450-500 horsepower), NP205 transfer case, and TH400 transmission. To prepare the engine, a PRW Performance flex plate is installed onto the rear of the LS engine. Apply a generous amount of red Loctite to the PRW Performance flex plate bolts before threading them in by hand. Torque the bolts in three stages: 15 ft-lbs, then 40 ft-lbs, and finally 74 ft-lbs, using a Quinn digital torque wrench adapter.

Goal: Install flex plate onto the engine

Tools and materials

  • 6.0L LS Engine General Motors — The main engine for the J20
  • Torque Wrench — Applying precise torque to the flex plate bolts
  • Red Loctite Loctite — Preventing bolts from loosening due to vibration and temperature changes

What they say

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get the flex plate bolted up. So, let's get it out. All right, I just got the LS mounts in. Time to show you guys the engine and transmission. There she is. 6.0 LS, about 450 500-ish horsepower. MP205 and TH400. Get the flex plate bolted on the back here. Get some Loctite on there, torque them to the right dimensions, the right pounds. And uh get this thing bolted up. All right. So, we got to throw this flex plate on. PRW Performance flex plate. And it tells you on there what side is the engine side. So, go ahead and line up these three holes with your three holes on your flex plate here. This is probably gross to most people, but get that in there. Go ahead and take your red Loctite. These are the same PRW Performance um flex plate bolts. Put a generous amount of red Loctite on there. Go ahead and thread that in there. You do not want these coming off. This will destroy absolutely everything in its path. I'm just hand tightening them right now, just to get them on there. Um but I'm going to I'm going to go ahead and torque them down to 74 foot-pounds. I'm going to do it I'm going to do it in three stages. So, the first set's going to be 15 40 and then 74. So, here I got my Quinn digital torque wrench adapter. I've been using these a lot. I like them. I'm going to set this to I'm going to set this to 15. All right, so the lowest I can go is 25. So, we're going to start at 25 and work our way up. All right, so I got the flex plate bolts on, torqued them down to 74 ft lbs. Now, I got to figure out how to get this transmission up and on there. I'm going to bolt this up, and then I'm going to go ahead and I'm going to bolt my engine mounts up to the side so I can get it in there. I can just slip the bolts right in here and be done. So, see how this goes. Here we got the

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