Hi. I'm wondering what the offset is on the early ford v8 rear ends? The offset i'm looking for is for the pinion and ring gear. I only wants facts no guesses.
Let me fathom a guess that what Rat Fink is asking is gear lash. General old timer setup trick is to take a piece of *news print and fold it in two, run it through the gears and it should be creased with sharp creases, not torn ( too tight) and not just wrinkled (too loose) that is going to be about .011 as I recall. *The dull pages not the shiny ads.
There is no vertical offset. The centerlines intersect. The side to side distance is adjusted with the gaskets to set the tooth mesh. The pinion is centered on the differential.
That is the case on some later model rear differentials that are offered with a wide range of gear ratios, for example some 10/12 bolt GM rears (2.28 to 4.xx), that require a different carrier either above are below a certain ratio. That is due to offsetting the ring gear to accommodate the larger, or smaller pinion diameter required with certain ratios. It is not necessarily true for others, banjo Ford axles for instance, as the range of ratios offered were closer (3.54 to 4.10), and any change required in the pinion diameter and/or ring gear thickness could be accommodated without changing the centerlines of the pinion and ring gear. Ray
Is the OP looking for a vertical or horizontal dimension? I would sure like to know what in the world he is trying to figure out.
I think a sketch from the OP is in order. My guess is that the question has been answered but maybe the translation is garbled.
Uh-huh...The larger pinion diameter will require a thinner ring gear and since the OP wants a measurement of centerlines between the r/p? It will depend upon the ratio. The end.
The ring gear in a early ford rear is part of the carrier. You do not bolt a ring gear on. It is made intergal with the carrier bearing stub. The ring gear teeth are angled depending on the ratio so the centerline of the teeth is on the centerline of the pinion. There is a set outside diameter of the pinion. All are the same. I must go thru the hole for the bearing sleeve.
Andy, I think your first post was probably what the OP was looking for. It would be nice if he would confirm that, though. The rest of us are just pissing in the wind. Funny how he asked for a definite answer, no opinions, but won't clarify the question.
This is the offset that I'm looking for. I want the offset for: Early v8 rear end Model a ford rear end Ford 9 inch rear end
The 9" info is about "Britanica" sized on the www. I know enough about gears to be dangerous, but in my days at GM "Chevy Gear and Axle" that dimension was what we checked as "V & H", vertical and horizontal dimensions. Usually checked if a gear cutter crashed and had a limit of .002 which could probably be lapped out if it was off by the max. I was in "soft roll", or gears before heat treat. Those more involved, feel free to correct my fuzzy memory , but I would call that dimension vertical centerline rather than offset.
I'm not asking about v and h. V and h are the movement of the pattern and I want the offset for the center position of the pinion to the center position of the ring gear
Ford specs were tighter than that...call it 0.000! Depth of pinion into its supports is another issue requiring lots of work on modern rears...Ford designed the banjo for quick assembly and true interchangeability; after the pair of gears were matched and run in on the whattyacallit machine, pinion was machined to sit at proper depth controlled only by very close limits on banjo and bearing dimensions. Nothing to adjust, just screwittogether. (your mileage will vary with modern reproduction gears, which will need careful work to get all together) 9" has very radial offset on pinion designed to get '50's cars closer to the ground...at the cost of power lost.
don't you call it a "hypoid" gear when the pinion is lower than the center line of the ring gear? That was done so they could get lower floors in the cars. and becouse that made more sliding action on the teeth as they meshed they had to make the hypoid gear oil to use in them. the old style "Ford " gears were just bevel gears. correct me if I'm wrong.
Early v8 rear end: 0.000", pinion centered in chassis. Model a ford rear end: 0.000", pinion centered in chassis. Ford 9 inch rear end: -2.250", pinion offset 0.940" to the passenger side.
Not asking about the translation, it's the REAR END! BUT...all kidding aside, the Hypoid design was a revolution in design, lowering floors proportionately... Ted Halibrand assured longtime use of his design, as his 'layshaft' was 5" below Hypoid centerline. Look at Indy cars from 1946 to 1960...most used the Halibrand rear, taking advantage of that L-O-W driveline.
The Jalopy Journal
