what about engine offset i just got a 9 inch out of a 68 ford f100 i noticed that the pinion is off center by 4 inches doesthis mean that the engine and trans has to move over by the same amount i know the up down pinion angle is critical what about side to side any info

 

woody...

your engine center line does not have to match your rear end center line

I doubt that you could get 4" of offset between the frame rails. 4" sounds like a lot... where are you taking your measurements ?? I'm just curious.

You didn't mention which engine you're using.... but if it will sit centered in the frame rails and you have steering linkage and header clearance and clearance on anything else... you don't need to offset at all... Just maintain the parallel center lines for engine and rear end... same on pinion angles...

this might give you some visual help

http://www.clubfte.com/users/jniolon...nephasing.html

later
John

 

im using a 302 with aod i measured the pinion centre between the backplates on my 68 ford pu 9 inch

 

with trucks centering the pinion is not as important as with a car. in a car the driveshaft has to run down the centre of the car through the tunnel, so the pinion is centered. that involves making one axle longer than the other.

on trucks the driveshaft doesn't have to run down a tunnel so Ford decided to make both axles the same lenght instead and that makes the pinion offset to one side. Since the driveshaft hangs down below the body, the driveshaft can run at an angle back to the rear end. where you place the engine is not critical as long as the centerline of the engine (crankshaft) is at a right angle (or parallel) to the rear end centreline. that is the engine should be parallel to the frame rails and not at an angle. this reduces vibration in the drivetrain. so you can offset the engine to gain clearance for headers or sterring box, etc.

hope that makes sense.

rgds
Mike

 

thanx you guys are always so helpfull