Pressure Plate/Flywheel for SM420 Swap - Pirate4x4.Com : 4x4 and Off-Road Forum

fj40tom · 08-18-2001, 10:32 PM

After searching the archives, I still have a couple of questions. I am starting a SM420 swap tomorrow. Majority of the info I have gathered says "use the 3-speed pressure plate on the 2F swap." I am assuming that I also have to use a 3-speed flywheel, is this correct?

Tom

DCruiser138 · 08-19-2001, 12:52 AM

i belive you do use the 3spd fly. this is what i remember...but i ned to know 4 sure too.

flexing40 · 08-19-2001, 07:16 AM

I don't know if there is a differance between the 2f and f engine flywheels but on our 72' sm420 conversions a Chevy 11" clutch fit inside the flywheel without having to grind down the o/s diamenter. Our flywheels have holes going to the o/s to relieve the clutch dust and debrie that could accumulate. Used the stock pressure plate. My son has been driving his as a daily driver and been through the Rubicon and Fordyce numerous times since June with no problems. Hope this helps.
Mike

EricFJ40 · 08-19-2001, 09:16 PM

You can use either the F or 2F Flywheels for this swap. I have used both and havn't seen any real difference between the two. You do have to use the three speed style pressure plate, with a standard Chevy 11" disc.

Something else to think about, I have been modifying the Toy three speed bearing retainers to fit the SM420. This way the indexing to the bellhousing is correct and you don't have to worry about multiple pieces fitting together.

fj40tom · 08-19-2001, 09:53 PM

What are you doing to the 3 speed bearing retainer?

Tom

JasonH · 08-20-2001, 09:21 AM

Hey TP, have you been to this site?

SM420 install

EricFJ40 · 08-21-2001, 12:07 AM

Quote:

Originally posted by fj40tom:
<STRONG>What are you doing to the 3 speed bearing retainer?

Tom</STRONG>

Basically I just chuck it up in the lathe and cut a new seal pocket and retainer ring grooves on the inside to match the 420. I then weld the old bolt holes and drill the new 420 patern in it. It usually takes about an hour or so and its ready to bolt on.

fj40tom · 08-21-2001, 07:12 AM

EricFJ40,

Thanks. I decided to have a sleeve machined to fit around the SM420 retainer.

Jason- I've seen the Extreme Bends site. That is where I got my plate.

Tom <IMG SRC="smilies/smokin.gif" border="0">

Eric · 08-22-2001, 12:06 PM

You can use your 4 speed flywheel and pressure plate with the 420 swap. I did and it works perfect. I also use the 4 speed clutch fork.

08-18-2001, 10:32 PM	#1 (permalink)
fj40tom Registered User Join Date: May 2001 Member # 4818 Location: Fort Worth, Texas Posts: 276	Pressure Plate/Flywheel for SM420 Swap After searching the archives, I still have a couple of questions. I am starting a SM420 swap tomorrow. Majority of the info I have gathered says "use the 3-speed pressure plate on the 2F swap." I am assuming that I also have to use a 3-speed flywheel, is this correct? Tom __________________ www.tompenningtonphoto.com

08-19-2001, 12:52 AM	#2 (permalink)
DCruiser138 Rock God Join Date: Dec 2000 Member # 2619 Location: kings beach, CA Posts: 1,716	i belive you do use the 3spd fly. this is what i remember...but i ned to know 4 sure too. __________________ Dustin Crawford --- OPEN DIFF DEUSH'

08-19-2001, 09:53 PM	#5 (permalink)
fj40tom Registered User Join Date: May 2001 Member # 4818 Location: Fort Worth, Texas Posts: 276	What are you doing to the 3 speed bearing retainer? Tom __________________ www.tompenningtonphoto.com

08-20-2001, 09:21 AM	#6 (permalink)
JasonH Registered User Join Date: Sep 2000 Member # 1767 Location: McKinney, Texas Posts: 765	Hey TP, have you been to this site? SM420 install __________________ TLCA #8123 Lone Star Land Cruisers - 79 FJ40

08-21-2001, 07:12 AM	#8 (permalink)
fj40tom Registered User Join Date: May 2001 Member # 4818 Location: Fort Worth, Texas Posts: 276	EricFJ40, Thanks. I decided to have a sleeve machined to fit around the SM420 retainer. Jason- I've seen the Extreme Bends site. That is where I got my plate. Tom <IMG SRC="smilies/smokin.gif" border="0"> __________________ www.tompenningtonphoto.com

08-19-2001, 07:16 AM	#3 (permalink)
flexing40 Registered User Join Date: Mar 2001 Member # 3899 Location: Spanish Springs Posts: 119	I don't know if there is a differance between the 2f and f engine flywheels but on our 72' sm420 conversions a Chevy 11" clutch fit inside the flywheel without having to grind down the o/s diamenter. Our flywheels have holes going to the o/s to relieve the clutch dust and debrie that could accumulate. Used the stock pressure plate. My son has been driving his as a daily driver and been through the Rubicon and Fordyce numerous times since June with no problems. Hope this helps. Mike

08-19-2001, 09:16 PM	#4 (permalink)
EricFJ40 Registered User Join Date: Aug 2001 Member # 6270 Location: Magalia, Ca Posts: 436	You can use either the F or 2F Flywheels for this swap. I have used both and havn't seen any real difference between the two. You do have to use the three speed style pressure plate, with a standard Chevy 11" disc. Something else to think about, I have been modifying the Toy three speed bearing retainers to fit the SM420. This way the indexing to the bellhousing is correct and you don't have to worry about multiple pieces fitting together.

08-22-2001, 12:06 PM	#9 (permalink)
Eric Registered User Join Date: Feb 2000 Member # 39 Location: San Martin, CA Posts: 3,266	You can use your 4 speed flywheel and pressure plate with the 420 swap. I did and it works perfect. I also use the 4 speed clutch fork. __________________ Eric Parts for Sale --> D44 shafts, 6 lug rims, air tank

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