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rotorwrench · 01-14-2018, 10:39 AM

The F100 came out in 53 but had different front mounting and oil pan on the V8 applications. Larger 100 series trucks may have still had the earlier type pan but I'm not very well versed on the larger early 100 series trucks. The 215 OHV 6 was also available so there may have been a lot of those in the early F100 pickups too.

The 8RT truck pans are deeper by a bit but it is the shape at the front that may or may not cause clearance issues in earlier vehicles. It's in one of those "try it first" categories before it is discounted to opt for a Mercury pan. The 8CM pan is closer to the 59 & earlier series pans in shape and profile but they are only similar. A person has to deal with the different road draft tubes too unless a PVC system is installed.

The 11-inch Long type clutch is a heavy dam thing. As was already mentioned, it takes more torque to get the inertia up on them than say a 9 or 10-inch Long type clutch. The pedal pressure is really not all that much of an issue. The lighter clutches will spin up faster and have higher rpm capability for sure and they hold just fine on lighter vehicles.

01-14-2018, 10:39 AM	#10
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,426	Re: ‘51 8RT in ‘47 coupe The F100 came out in 53 but had different front mounting and oil pan on the V8 applications. Larger 100 series trucks may have still had the earlier type pan but I'm not very well versed on the larger early 100 series trucks. The 215 OHV 6 was also available so there may have been a lot of those in the early F100 pickups too. The 8RT truck pans are deeper by a bit but it is the shape at the front that may or may not cause clearance issues in earlier vehicles. It's in one of those "try it first" categories before it is discounted to opt for a Mercury pan. The 8CM pan is closer to the 59 & earlier series pans in shape and profile but they are only similar. A person has to deal with the different road draft tubes too unless a PVC system is installed. The 11-inch Long type clutch is a heavy dam thing. As was already mentioned, it takes more torque to get the inertia up on them than say a 9 or 10-inch Long type clutch. The pedal pressure is really not all that much of an issue. The lighter clutches will spin up faster and have higher rpm capability for sure and they hold just fine on lighter vehicles.