4.3l to a 4 speed? - Pirate4x4.Com : 4x4 and Off-Road Forum

corkatoa · 02-26-2010, 07:38 PM

Truck was a 77 350/4speed/np205 .
I was putting my truck together and found cracks in the heads of my 350. can't locate any heads(live in the kootenays, can't travel too far right now), but have a 91 4.3l with low miles. Not worried about electrics and such, but am wondering about hooking it up to the 4 speed. Any issues or is it basically the same as a 350? Am I going to be able to bolt up the flywheel/pp/clutch to the 4.3?

thanks

Frozen246 · 02-26-2010, 08:30 PM

I might be wrong but as far as I know the 4.3 is just a 350 without two cylinders. It seems like it should work fine but I'm not sure about the flywheel, clutch and pressure plate. I do know that they have the same bellhousing pattern though.

Wheel28 · 02-27-2010, 08:26 AM

Its a 91 4.3 so you will need a one piece rear main flywheel. The 77 350 flywheel is two piece rear main so it wont bolt up.

The clutch should work with the new flywheel.

Wheel

corkatoa · 02-27-2010, 07:18 PM

thanks, you are correct on the flywheel.

what kind of problems, if any will it cause to the pcm to have the tranny inputs not connected? I assume it will just ignore the lack of connections upon powering up?

anyone ever put a 4.3 in front of a 4 speed? no results in search, so i assume maybe not.

the_experience3006 · 02-27-2010, 10:02 PM

The only connections to the transmission would be the VSS and the drivers for the TCC solenoid. You can emulate the VSS although I don't think it's necessary and the TCC drivers don't matter one bit.

02-26-2010, 07:38 PM	#1 (permalink)
corkatoa Registered User Join Date: Oct 2009 Member # 144266 Posts: 11	4.3l to a 4 speed? Truck was a 77 350/4speed/np205 . I was putting my truck together and found cracks in the heads of my 350. can't locate any heads(live in the kootenays, can't travel too far right now), but have a 91 4.3l with low miles. Not worried about electrics and such, but am wondering about hooking it up to the 4 speed. Any issues or is it basically the same as a 350? Am I going to be able to bolt up the flywheel/pp/clutch to the 4.3? thanks

02-26-2010, 08:30 PM	#2 (permalink)
Frozen246 Registered User Join Date: Nov 2009 Member # 147269 Location: Upstate NY Posts: 37	I might be wrong but as far as I know the 4.3 is just a 350 without two cylinders. It seems like it should work fine but I'm not sure about the flywheel, clutch and pressure plate. I do know that they have the same bellhousing pattern though. __________________ DD: 1995 F150 XL - 300-6 - M5R2 - 4x4 - 31's Frame Off Project: 1977 F150 - 300-6 - NP435 - 4x4

02-27-2010, 08:26 AM	#3 (permalink)
Wheel28 Everyday Wheeler Join Date: Nov 2006 Member # 83086 Location: Houston, Tx Posts: 331	Its a 91 4.3 so you will need a one piece rear main flywheel. The 77 350 flywheel is two piece rear main so it wont bolt up. The clutch should work with the new flywheel. Wheel __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

02-27-2010, 07:18 PM	#4 (permalink)
corkatoa Registered User Join Date: Oct 2009 Member # 144266 Posts: 11	auto tranny connector thanks, you are correct on the flywheel. what kind of problems, if any will it cause to the pcm to have the tranny inputs not connected? I assume it will just ignore the lack of connections upon powering up? anyone ever put a 4.3 in front of a 4 speed? no results in search, so i assume maybe not.

02-27-2010, 10:02 PM	#5 (permalink)
the_experience3006 Registered User Join Date: Sep 2006 Member # 80052 Location: St. James, MN Posts: 1,704	The only connections to the transmission would be the VSS and the drivers for the TCC solenoid. You can emulate the VSS although I don't think it's necessary and the TCC drivers don't matter one bit. __________________ [QUOTE=abig84;9192789]i swear id be gay if it wasn't for all the gay sex that's involved[/QUOTE] [QUOTE=TexasBlake;10305687]She's not that hot. I was just looking for a quick lay and she all wanted to like go on dates and shit. [/QUOTE]

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