Quick version: do I need a special pilot bushing to run a small in/small out toploader 4 speed behind a 428? I am using a plain bronze bushing from summit that just matches the shaft input diameter to the hole in the back of the motor.

Background:
Not sure if this is the right place, but I have a question about using a specific transmission. My '73 F100 has a 428 FE and I am running a small in/small out toploader 4 speed. I know that is not the factory correct transmission for that motor, but it was all I could find when we were getting the truck together (and it matches the clutch and driveshaft yoke).

I brought the trans to a reputable shop in the Bay area (All Standard Transmissions) and the owner said that to run that combination I need a special pilot bushing- ford part C5TZ-7600-D. Something about the input shaft being different lengths between small in and big in and the bell housings being slightly different depths for the different trans. I had never come across this information, and though as long as the input shaft diameter was matched to the clutch and pilot bushing, all was good. Anyone know if this is correct?

 

C5TZ-7600-D (replaced C5TZ-7600-A) .. Pilot Bushing - 1 3/8" O.D x 11/16" I.D. x 1/2" wide / Obsolete

1965/72 F100/350 240/300 I-6 / 1973/76 P350/500 300 I-6.

CARPENTER NOS OBSOLETE PARTS in Concord NC has 19 = 800-476-9653.

GREEN SALES CO. in Cincinnati OH has 90 = 800-5434-4959.

 

Thanks NumberDummy. But do I need this part? What is wrong with a normal bushing? And is that true about the input shafts and bell housings being different lengths?

 

ps. The trans is from a 67 Fairlane, the motor from a 66 Galaxie. I read that the truck vs car bellhousings were different, shouldn't be a problem here?

 

1966: Last year that Warner T-10's were installed. 1967 Fairlane would have come w/a Ford 4 speed top loader.

Pic: Page 1 of Warner T-10 trans parts list: B = Fairlane, F = Mustang, X = Falcon.