So I finally got under the car and sanded off 50 years of gunk and undercoating. I got this code off the rear axle: FJ0325
So my understanding is that is 3.08 ratio that was made on March 25.
I know it is a 10 bolt. Not sure how to figure out what size. Wondering where to go from here. Just had the engine rebuilt and have around 400 horses to play with.
It would be much easier to help if you include what year car you are working on. A photo from the rear showing housing would be good too., try this to help:
If the rear end hasn't been change then it's a 8.2 10 bolt. All '64 to '72 Chevelle 10 bolt rear ends were the 8.2. Many parts got changed in these cars over the last 50 years, so it could have been swapped.
Do you think it is worth upgrading to a 3.55 or 3.73 from a 3.08 with that?
Hehe, someone got a little sloppy with a lot of things on this car. Realized yesterday the bolts for the sway bar bushings/connects aren’t the same. Passenger side spacer spins freely and has about 1/4 to 1/2 of play in it. The one on the driver side, which I assume is the correct one, is right and doesn’t have play in it. One is a coarse thread and one is fine.
Everything really depends on what your goals are with this car: street, strip, road track, cruiser? With 400 ponys ( i suppose thats flywheel?) not rwhp. If its just street with a little fun I wouldn't hesitate to put a little money into your 10 bolt. I did, 1972 Chevelle, 350/350 3:36, posi, new bearings and seals, hardened axels, girdle, and brakes for less than 1K. Huge difference, great low end, stomped on it a few times - feels fantastic and moves the car pretty well. Don't underestimate that 10b.
That’s all I’m after. No track for me. Street and getting on it here and there. When I get time I will pull the cover off and see what is there. Thanks for your info.
Eaton 10bolt posi units are readily available for these rears. We recently added on to my son's 68 4dr with a crate 350 and wide ratio Muncie. His car was also originally a 307/PG car. It's now somewhat of a sleeper, with factory air cond.
Oh ya, and another thing that I like to do when I have a rear out of the car, is to add a magnetic drain plug. The LAST year Chevy installed a rearend drain plug was 1961.
I drill and tap for a 1/2in fine thread plug (same plug as used in oil pans). Then I use a die grinder with a sanding disc to make the area around the hole smooth and flat.
I also install new buishings for the trailing arms while I have the rear out of the car. I made up a puller from misc parts, old bearing races, a length of all thread, etc, that I had around the shop.
Man, my wife would love me disappearing into the garage for a month or so! Thanks for the input. I’m a little intimidated by installing new ring and pinion but would love to give it a shot.
I would install some kind of overdrive trans. Makes street driving a lot more fun.
How about 3.73 gears and a 200R4 ? That would be a fun combo.
Great acceleration and good cruising too.
It takes special tools to work on a 10 or 12 bolt. I would ask around , maybe someone on craigslist ? I wouldn't do that myself. It's enough of a PITA to pull and reinstall that 10 bolt. >
I would install some kind of overdrive trans. Makes street driving a lot more fun.
How about 3.73 gears and a 200R4 ? That would be a fun combo.
Great acceleration and good cruising too.
It takes special tools to work on a 10 or 12 bolt. I would ask around , maybe someone on craigslist ? I wouldn't do that myself. It's enough of a PITA to pull and reinstall that 10 bolt. >
I would love that. I just had this powerglide rebuilt though. I had the engine rebuilt so I won’t be able to do anything that is very expensive for a while. I do want to do 3.73 though. If I could find a 200R4 at a good price it could work out.
I hate to add insult to injury, but it is against my religion to have a car with an auto tranny------------and I absolutely refuse to offend my pastor!
I know. I want to convert it but it may be a few years before I can do that. Especially after this engine rebuild.
Sent from my iPhone using Tapatalk
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Team Chevelle
5.1M posts
115.6K members
Since 1998
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!