i need to find a steep set of gears for my 9.25 chrysler axle. I need something as steep as 5.13, but the only thing i can find are 4.56's anyone got any suggestions where i can get these and from who cause i cant.

4.88 is the lowest you can get currently.

swap a dana 60 in...lol..I hated my 9.25..

unfortunately im using the axle for racing. And racing what u ask?

1981 Full size dodge van B250
tuned 360 engine, lots of bells and whistles
Hughes 2700rpm stall converter
GVWR 6400lbs

1/4 mile with 3.55's 15.78seconds

Its easy to make small things go fast.

Wait till i get it dialed in and then drop a NOS bottle on it!:mad3:

A 9 1/4" would be the last axle I would want to put that kind of load on. The pinion bearings will probably go to hell in a hurry as they lose preload. Swap to a D60. More gear and locker choices and it will take a beating a lot longer than a 9 1/4" car axle.

i dont know if this makes any difference, but it came out of a van

a 60 would be almost a simple bolt over... or you can try a 10.25 rear end. Not sure on the gear choices there.

Use a D60. Much larger range of gears, cheap as hell to find, 8 lug, full floating and will last a lot longer than the pinion bearings in the 9 1/4".

No doubt dude get a D60. Why do you want 5:13 gears?

moser and randys ring and pinion said that would be optimal for my set up. Currently i pull through the traps at 4000rpm at 86.5 mph with 28.25" tires, 3:55 gears and a automatic 727 trans and hughes 2500hd converter. My cam was spun on a cam lobe program because its a custom grind. the specs say it 224/246 duration @.46/.48 in lift with a rpm band of 2000-5700rpm. According to some old school racers i want to be pulling through the traps @200-300rpm below max rpm rating to ensure im still pulling through the eye's.

So with 5:13's and the same tires and trans and cam i should pull through the eyes at 5400-5600 rpm suppossedly to get max use of all components and best time, at least till i put NOS on it:eek:

Well either way I'd be looking for a new rear axle. The 9 1/4" is a very poor choice for high load use and the gear you need is not available for it. A D60 is cheap, easy to swap, has gears from 3.54-7.17 and will take what you require of it.

moser and randys ring and pinion said that would be optimal for my set up. Currently i pull through the traps at 4000rpm at 86.5 mph with 28.25" tires, 3:55 gears and a automatic 727 trans and hughes 2500hd converter. My cam was spun on a cam lobe program because its a custom grind. the specs say it 224/246 duration @.46/.48 in lift with a rpm band of 2000-5700rpm. According to some old school racers i want to be pulling through the traps @200-300rpm below max rpm rating to ensure im still pulling through the eye's.

So with 5:13's and the same tires and trans and cam i should pull through the eyes at 5400-5600 rpm suppossedly to get max use of all components and best time, at least till i put NOS on it:eek:

Back in the day, Mopar offered a low 5 something ratio gear for the 9.25, but I have not seen one in at least 15 years. Personally, I'd look for an 8 3/4 out of an early 70's Dodge van, it is plenty strong, has gearing options available , is easy to swap ratios in, it will fit your van, and is 100 lbs or so lighter than a D-60. IIRC the 1981 Vans were still 4.5" BC so the 8 3/4 would be a no brainer for me.

IMO the 9 1/4 is fine for street/racing use, plenty of Dakota guys drag racing with 400+hp without problems. It wouldn't be my first choice to wheel with though.

Ditto on the 8-3/4, you can get the gears you need and they are plentiful and easy to work on. Otherwise I'd go with a Ford 9" since they are cheap and with 28" tires, I doubt you will ever break one with 31 spline axles.

Stay away from the Dana 60, it will only add weight you don't need to be hauling around.

I sort of have to agree with the 8 3/4" rear, but as to the weight of the D60, if he were concerned about weight, I don't think he would be drag racing a fullsize van. Plus since it's a B250, it may already have 8 lug rims.

dana 60s and ford 9" are some of drag racers best friends.

I sort of have to agree with the 8 3/4" rear, but as to the weight of the D60, if he were concerned about weight, I don't think he would be drag racing a fullsize van. Plus since it's a B250, it may already have 8 lug rims.

My parents had a 1981 Ram 250 conversion van and it was a 5 lug, AFAIK through most of the 80's the 250 Vans were 5 lug, I do not remember when they switched to the 5 1/2" bolt circle, however. And you might be suprised how light an empty full size Ram van is, The GVW is 6400 LBS and it is a 3/4 ton, so Im guessing 47-4800 Lbs. Regardless, why add extra weight,if you don't need it.

Well a van with probably very little weight transfer and the majority of the weight up front, a little weight on the rear tires might not be a bad thing, lol. At any rate only some of the B250s are 5 lug, many of them have the 8 lug 9 1/4" but after looking at the catalog it seems the 8 lug 9 1/4" was not available in 1981. Hell the '82 catalog says that 9 1/4" axles were discontinued on 3/15/82 in B150/B250 and AW150 models, so he's damn lucky he has a 9 1/4" and not the 8 1/4", lol. With that early of a model, it's sure to be a small bolt pattern as they didn't change to the larger one until the mid '80s so that makes most of my argument for the D60 a moot point. If it is indeed a small bolt pattern I'd go for the 8 3/4" with a 489 case.

The van is originally equiped with the small 5 lug bolt pattern, despite the bolt pattern the rotors are the super heavy duty large wheel bearing rotor. Actually i had to get rotors for a older 1978 5 lug 3600lbs front end.

the old 9 1/4 rear thats toast is out of a 1978 with the small bolt pattern.

The newer 9 1/4 rear i picked up is out of a 1997 dodge van b150 with the larger 5 lug bolt pattern.

Lots of stuff on the internets(lol) says that the 9 1/4 built right is just as good as 9 incher. I dont want to get into to much modifying a d60 or a 9incher to make it fit. I figure id rather put in what fits now. As far as the 8 3/4 im leery about the weight of the van and the load it would put on it.

A 9 1/4" is a very deceptive axle in my opinion. A lot of people claim that they have no problems wheeling and abusing a 9 1/4" and yet they seem to ignore the "Dodge clunk" that is directly related to the 9 1/4" and it's pinion preload and backlash issues. If you do decide to run a 9 1/4", keep a close eye on the pinion and replace the pinion bearings and crush sleeve as necessary. A better way would be to go with Ratech's crush sleeve eliminator. I ran the stock 9 1/4" in a '88 W150 show truck with 39" tires for cruising duty only and had nothing but problems out of the axle. I was told by many "in the know" people to ignore the clunk and just drive it after replacing the pinion bearings 3 separate times since the full rebuild, so I decided I'd run it and see how things went. Everyone else ignored it, why couldn't I? A few months later the pinion had gotten so loose that it locked the rear axle in a turn and I rolled the truck on it's side to the tune of a $38k loss of my show and cruising truck. I refuse to run another 9 1/4" and every 1/2 ton truck I buy gets either a 8 3/4" rear or a D60. From working at the dealership, I'd say in my area they have about a 30% failure rate while under warranty, and that's a bit too much in my opinion.

I have a complete dana 60 . Just needs ring gear. Throw that 9.25 in the trash and gat a dana 60. Dont throw money at junk parts.

While I still reccomend the 8 3/4, I have to say the 9 1/4 is not THAT bad, I had one in my Little red Express truck, that had 200K miles on it, I installed a set of 3.91s (they used to be cheap from Mopar) and a Sure Grip, and put another 50K miles on it before The truck rusted into the ground arond it. I then swapped the axle into a 1981 Trailduster, along with the 420HP 408 stroker from the LRE, and ran 35" Mickey Thompsons on it and I am not one to baby a vehicle by any means. I drove the Trailduster for 100K miles, sold it 9 years ago, and the truck is still runing strong. Never had an issue with the rear axle.

I have replaced many 3.92s for 4.56 in the 9.25 and recently swapped my own 4.56's to 4.88's. The Motives were used most times but after shelling 4 pinion teeth off the 4.56 motives I stepped up to the 4.88 Yukons and couldnt be any happier unless I could have found 5.13's. Almost all Motive 4.56 seem to have a slight noise issue even with proper installations,but the Yukons are whisper quiet.

I myself am patiently waiting for a D60 to swap in of another manufacturer to make a 5.13.