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Sep 19, 2016 | 01:28 AM

Sschultz13

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Transmission questions

How much of a pain is it to use an adapter plate to go from a solid cast 460 c6 to a 300? Where might I find such a thing? I reeeeally don't feel like pulling the transmission when I pull the remains of a 460 out.

Or, what is required to convert to a 4 speed?

I have a 1981 f250 300/4 speed 4x4 for parts, and an 85 as well. I bought the 83 with the 460 mainly for the body, and the fact that is was insurable, whereas my other 2 are not. I was told that the 460 needed a head gasket, but upon removing the first head, found, in addition to 3 bent push rods, minimum 4 cracked pistons. So now the motor is getting pulled, and from what I've learned, the transmission as well.

Sep 19, 2016 | 02:47 PM

FuzzFace2

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From: Angier, NC

So you want to run a 300/six and the C6 from the 460?

If so I do not know of any adapter plate to go from the large 460 to small 300 bell housing pattern.
If there was I don't know if you would have the room between motor and radiator.

If you want to use a C6 you will have to find a small block bell housing pattern C6.

For the 4sp you would need pedals, clutch linkage, flywheel & assy. for the six, bell housing to fit the small pattern and the trany you will get.
You would also need the stick trany floor cover and front yoke and/or drive shaft.

If going this route best to buy a stick truck for all the parts and even then you may need to replace/fix the clutch linkage parts as both of my trucks the linkage needed fixing.

Just my thinking on this.
Dave ----

Sep 19, 2016 | 02:50 PM

Franklin2

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From: Virginia

Even if you found an adapter, it would not be cheap. The parts you need are in plentiful supply in most areas of the country. I think I would go with a 5 speed instead of a 4 speed if you could.

Here are some places in California that have the lighter duty 5 speed trans.

1990
Transmission
Ford Truck F150 MAZDA 5SP,2WD,4.9L-164K 164,000 A 5735U $600 United Truck Dismantlers Inc. USA-CA(Marysville) Request_Quote 1-800-371-9555 Request_Insurance_Quote

1990
Transmission
Ford Truck F250 VERIFY RATIO 152,013 A $450 KHS Auto Dismantling USA-CA(Rancho-Cordova) Request_Quote 916-858-2630 / 916-631-0119 Request_Insurance_Quote

1989
Transmission
Ford Truck F150 101K 101,000 A 016335 $400.08 Coast Auto Supplies and Dismantling, Inc. USA-CA(Watsonville) Request_Quote 1-831-722-5050 Request_Insurance_Quote

1989
Transmission
Ford Truck F150 TRANY CORE CORE CORE 5 SPD MAN 51 A 100045 $Call Rancho Ford Truck RCAR Member USA-CA(Rancho-Cordova) Request_Quote 800-434-2222 / 916-638-2222 Request_Insurance_Quote

1989
Transmission
Ford Truck 150 rx40751 rx4075 $674 Truck Parts Company USA-CA(Baldwin-Park) Request_Quote 1-800-411-8718 (Cali only) 626-337-7264 Request_Insurance_Quote

1989
Transmission
Ford Truck F150 89 F150 5SPD 2WD TRAN Mazda/Toyo Kogyo 3.55 42641 $650 Pearsons Auto Wrecking USA-CA(Ridgecrest) Request_Quote 1-800-446-5865 Request_Insurance_Quote

1990
Transmission
Ford Truck F150 5SP,3.0L,10/89 6403 $500 All Ford Auto Salvage USA-CA(Anaheim) Request_Quote 714-993-2110 Request_Insurance_Quote

1989
Transmission
Ford Truck F250 4SPD OD 6B70326 $450 Infinity Auto Salvage - SCADA USA-CA(Palo-Alto) Request_Quote 1-888-884-6346 Request_Insurance_Quote

1992
Transmission
Ford Truck 150 TZ32787 CORE F/PARTS OR REMAN TZ3278 $224 Truck Parts Company USA-CA(Baldwin-Park) Request_Quote 1-800-411-8718 (Cali only) 626-337-7264 Request_Insurance_Quote

1990
Transmission
Ford Truck F150 6M5 4.9 6/90 MAZDA/TOYO-KOGYO, WHITE, Prod Date = 06/01/1990-73K 13H0160 $660 Viking Truck and Auto USA-CA(Redding) Request_Quote 1-800-338-7474 Request_Insurance_Quote

Sep 19, 2016 | 03:02 PM

Sschultz13

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I am in BC. I have a 1981 f250 300/4 speed 4x4 for parts, and an 85 as well. I bought the 83 with the 460 mainly for the body, and the fact that is was insurable, whereas my other 2 are not. I was told that the 460 needed a head gasket, but upon removing the first head, found, in addition to 3 bent push rods, minimum 4 cracked pistons. So now the motor is getting pulled, and from what I've learned, the transmission as well.
And just for the record, I've driven 5 speed and 4 speed, and actually prefer the T18.

Sep 20, 2016 | 09:59 AM

Franklin2

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From: Virginia

It won't be hard to sit the 300 with the 4 speed in place. You will have to grind/drill the motor mount brackets out of one truck and transfer/bolt them into the other. The 300 motor mount system is setup a little different.

Sep 20, 2016 | 12:50 PM

fljab

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From: Mims, FL

A T19/19, or NP435 shouldn't be that hard to find. If you can, get all the parts with it that you'll need like transmission hump cover, crossmember, clutch linkage, etc.

I see one of your other trucks have a 4 sp so some of the parts could come from that. You don't say how the other truck is parts wise. I take it both of those are parts trucks? You'd be way ahead if one or both of those had a setup like you need.

Sep 20, 2016 | 01:24 PM

Sschultz13

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I'm good for parts. Both my 81 f250 and 85 f250 are 4 speed 300s. And the power train on both is untouched.

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Sep 20, 2016 | 01:55 PM

Sschultz13

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The 81 was my daily driver for about 3 months before the lights decided to stop working at an RCMP roadblock, aND so it got pulled off the road due to that. Never had any issue with the motor itself. Is currently running propane, and has been for at least the last 20 years. I am 3rd owner of it. The 85 I bought for the much better box and the tires that were on it. Was told that she'd fire given the power, but I have yet to have gone and fired her up.

Correct me if I am wrong, but to convert the 300 back to gasoline, I'll just need a different, gas carb? The existing fuel pump in the new truck wired in and heater core lines sent directly to the proper locations on the block and water pump, since the propane mixer is no longer required?

Sep 20, 2016 | 05:14 PM

#10

Franklin2

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From: Virginia

You may want to check the 460 fuel system. A lot of the 460's had a oddball fuel system with electric pumps in the tank or tanks, relay up front and the whole mess was powered through a oil pressure switch. Gives people a lot of problems when things go wrong. So you might want to pull the fuel system from the 85 truck if yours is missing in the 81.

You will have to study your propane conversion. Some of them retain the old carb and just use a jet to inject the propane through the old carb. They just turn the gasoline off to the carb with a valve.

Sep 20, 2016 | 07:17 PM

#11

Sschultz13

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Will double check the fuel system. It has an aftermarket electric fuel pump. And the carb that's in the 81 specifically says that it is a propane carb. Will look at the fuel system more once the motor is completely out.