Rear end

[MarkAubuchon]

Would a rear end out of a 47 Plymouth fit under a 1951 Dodge Truck. dont want to spend a lot of money, 410 should be better than 430

[Young Ed]

You should be able to swap center sections and reuse the truck housing axles etc. You might even find the 47 is a 3.90 if you're lucky.

[Dan Babb]

I put a 96 Jeep Cherokee (not Grand Cherokee) rear end in my truck. You can find Jeep rear ends pretty cheap. I think I paid $100 for the one I found on craigslist. Plus mine had a 3.55 rear ratio and you get better drum brakes.

Pretty simple swap. Cut off the shock mounts. Weld on new perches (cheap and easy to find a Tractor Supply) and you're done. Wheels bolt right on (same bolt pattern). You might need to modify the driveshaft length though.

[B1B Keven]

Would a rear end out of a 47 Plymouth fit under a 1951 Dodge Truck. dont want to spend a lot of money, 410 should be better than 430

Check the 3rd member bolt pattern first. I was given an axle from a '47 Plymouth and the pattern was different. It also had bolts instead of studs/nuts.

[NiftyFifty]

I put a 96 Jeep Cherokee (not Grand Cherokee) rear end in my truck. You can find Jeep rear ends pretty cheap. I think I paid $100 for the one I found on craigslist. Plus mine had a 3.55 rear ratio and you get better drum brakes.

Pretty simple swap. Cut off the shock mounts. Weld on new perches (cheap and easy to find a Tractor Supply) and you're done. Wheels bolt right on (same bolt pattern). You might need to modify the driveshaft length though.

This would be my recommendation too, much newer brake technology and not much more work. I've seen threads where the stock dshaft would work so that may be a good option.

[pflaming]

I put a '97 cherokee axle in mine: changed the perches, nothing else. My drive shaft and U-Joint matched up.

[Don Boger]

9 inch ford will bolt right in without having to change the perch, the only problem my uncle had with the set up is the drive shaft would sometimes fall out of the transmission.

Edited July 23, 2012 by Don Boger
added picture

[HanksB3B]

9 inch ford will bolt right in without having to change the perch, the only problem my uncle had with the set up is the drive shaft would sometimes fall out of the transmission.

I don't see why that would be a problem...

Hank

[Plymouthy Adams]

not all pinion gear shafts are the same length..the replacing of one rear gear with one having a shorter shaft would cause said problem..plus I would think (have always found ) that a shaft that is not seated enought into the trans tailshaft will cuase undue vibrations..lots of folks that swap engines in front wheel drive cars and not get the engine centered on the horizontal mounts equally will have similar probs with one of the halfshafts..

[tom'sB2B]

If you are just replacing the pumpkin: The axle shaft spline count is different. It has a 10 count and you have 16. The fill plug for the plymouth is on the axle while yours is on the pumpkin, so there is no way to put fluid in it. The pinion length might be different too. Make sure the bolt pattern is the same (you should have an 11 bolt set-up). Lots of things to look at.

[Guest P15-D24]

If your truck is a B or C model, and you just want to swap the carrier (AKA pumpkin, carrier, diff, rear end) it is a direct exchange. I personally have done this swap on my P15 back in the 70's when I somehow chipped a ring gear. The mechanic did in less than 45 minutes. Drained the oil, pulled the wheels and axles, dropped the driveline at the pinion and pulled the carrier. Installed the new carrier, installed the axles and wheels and reattached the driveline. Filled it with oil and I drove it for another 30 years. Hollanders also verifies it is a direct swap. Hollanders # is 304 in the carrier assemblies section.

Edited July 24, 2012 by P15-D24

[55 Fargo]

This would be my recommendation too, much newer brake technology and not much more work. I've seen threads where the stock dshaft would work so that may be a good option.

Ditto, 1980s Mopar 8 1/4 diff on the back off the 55 Fargo, with 3.23 gears. Was driving at about 45-50 mph, can hardly hear the engine, try that with 4.11 or 4.30 gears, even 3.90s, at 60 mph she don't sound overly busy either.

Now on the 47 Chrysler, I have 3.73, if I ever need to swap, will also get a 3.23 gears, makes a big difference, and the modern brakes are nice too..

Mark, if you could find the diff pumpkin from a 46-48 Chrysler, lot of them were 3.55, or even a set of 3.73s would not be so bad either.

[tom'sB2B]

I bought a rear differential out of a 47 plymouth with a 3;90 diff. It doesn't have a fill plug in the pumpkin. You would have make a fill plug hole in it to make it work in your tuck or swap the intire axle. It takes a ten spline shaft, where as my 1950 b2b has a 16 spline shaft. I tried to do the exact same swap a week ago. Just make sure you have something that will fit before you tear everything apart.