The Stovebolt Site Forums The Shop Area Engine Shop Difference in 8 inch, 9 inch Fxxd rear end.

This may be offensive ? I want to purchase a reproduction chassis for my son. The builder suggested a Fxxd rearend, with no gear or bearings. I am totally ignorant to anything that is stamped Fxxd, and prejudiced.
What G.M differential combination would be an alternative ?
33 Chev coupe, 327, and 66 powerglide, which he may change.
I seek help as he lives near Seattle, this is the only help I can offer.
Thanks Guys

What is Fxxd? Or do you mean FORD?

Lug bolt pattern for one

so
you'll have two different spare tyres to carry??
i used a 12bolt from a 77 1/2ton suburban in my 3104, w/ 340:1 -- 6 lug. see forbes list below

http://www.chevytrucks.org/tech/rear_ends.htm
http://www.drivetrain.com/GMtrkratio_posidata.html
http://www.hotrod.com/techarticles/axle_rear_end_guide/index.html
http://www.gearsareus.com/
http://www.steeltechsolutions.com/REAR_AXLE_ID.html
http://www.chevytrucks.org/tech/ifs&rearend.htm
http://www.g-body.org/tnt/diffs/diff-housings.php
http://www.customclassictrucks.com/featuredvehicles/66458_1954_flame_chevy_pickup/index.html

If your going to go with ford diff, go with the 9". There's much more aftermarket support for it. Waht the builder is trying to sell you on, though, is an installed bare housing, you'll have to get you're own 3rd member for it. Not really a problem, as that diff is used in almost all customs/hot rods/race cars/every Nascar racer. Unless you have the equipment to do the setup, I'd suggest getting a pre-assembled 3rd member with whatever gear you want to run. I'd also advise a TH700R4 if the car is going to be used on the street, you won't be happy with the 'Glide. One more thing, depending on what front suspension is being used, you'll want to specify that you have matching front and rear bolt patterns on the hubs, not really a big deal. Most likely, the choice will be 5 x 4 1/2", which is the common ford/MoPar pattern. That'll give the widest choice of wheels.

The Ford 9" is a great rear end for sure the best GM alternative would be a car 12bolt a Mopar 8 3/4" would also be a good choice. The 9" ford is your best bet though. Scribner Welding in Kent WA. if I could find his card I would give you the number but look him up very good and reasonable at building custom rear ends.

Oh here you go I didn't know he had a web site.
http://scribnerwelding.net/

I would go with a Moser rear diff. You send them your measurements and what gear ratio, width and bolt pattern, brake style and they send you a diff that fits like a glove. It's a Ford 9" style but much beefier,
Scott

I don't recal who makes it, but ther's one out called the 9+. basically, it's a ford 9" housing with Chevy 12 bolt guts. Seems that the gear from the 12 bolt is actually stronger due to the better location of the pinion in relation to the ring gear.

Thanks Fellas
I appreciate the response, sometimes even adult children don't listen. I wish there was a resource like this site when I was young!
Again Thanks
I may (will) call on you again

theres nothing wrong with a good power glide with a shift kit and big motor when it shifts you know it and there realy fast all they do is shift twice iv been in some fast cars that have been blowen away buy the power glide and on top end also

The 'Glide will be fine, as long as the rear is geared right. And 'Glides only shift once, hi gear is 1:1. However, if this car is going to see highway use and regular driving, a trans with an overdrive will be much more pleasureable at highway speeds.