B Body rear ?

[73chalngr]

 Is a 66 Belvedere a B body ? Will  that rear work under a challenger with the doctor diff offset hangers ? If so is there anything else I would need ?

[303 Mopar]

YES!  Although I think '66-'67 rear ends are 1" more narrow than '68-'70 rear ends.  Doctordiff.com has relocation brackets.

[JonH]

https://www.bigblockmopar.nl/tech/mopar-rearaxle-dimensions/

[floorit426]

Definitely, some bigger tires! We put that set up in a '73 and were able to get some 295-R50-15 tires, under it. That's with the rear at stock height.

[RUNCHARGER]

Good score: You'll be happy with that swap.

[73chalngr]

Well according to the dimension chart I will be off by an 1/8 th inch . Or is that negligible.

[HP2]

Is a 66 Belvedere a B body ? Will  that rear work under a challenger with the doctor diff offset hangers ? If so is there anything else I would need ?

Yes, Yes, and no. This is a bolt in deal. Although, with a 1" relocation kit , spring percehs and a welder, the same can be done  to the E body housing.

YES!  Although I think '66-'67 rear ends are 1" more narrow than '68-'70 rear ends.  Doctordiff.com has relocation brackets.

According to the lnked chart, 5/8 narrower overall than 68-70. Spring mounts are in the same 44" location for both. The over all width only impacts wheel backspace for maximum width.

Well according to the dimension chart I will be off by an 1/8 th inch . Or is that negligible.

Actually, 5/8 overall or 5/16 per side, but no, this doesn't matter. As mentioned immediately above, this only changes the rim backspace you would use if you are pushing for maximum width.  E body housing with offset springs will have more backspace than a  68-70 housing, which will have more  backspace than a 64-67 housing. Although the B body differences are  pretty negligible.

[GrandpaKevin]

I installed a 1967 B body 8 3/4 rear end under my wife's 1971 R/T Challenger using Dr. Diff's offset hanger kit.

The B body rear end bolted right in with the kit.

I had to:

-Trim the rear valance mounting brackets to clear the rear leaf spring hangers because they were moved in an inch.
I suggest the very first thing you do is remove the rear valance and leave it off while removing your current rear end and spring hangers and installing the B body rear end, then test fitting/trimming installing the valance last.

-You either need to buy/make the correct 66-67 B body length rear metal brake lines for the rear end or try to bend the current E-body width ones to fit, I bought the correct B body ones.

-If you have a rear sway bar and want to keep it you will need to bend the ends in about an inch.

I used a custom set of 15x10 wheels on the rear with 5 3/4" back spacing knowing the back spacing was a little too much.
After doing some test fitting with 275/60-15 tires I ended up using a 1/2" wheel spacer(I previously installed longer wheel studs knowing I was going to use wheel spacers) so about 5 1/4" maximum backspacing seems about right using a stock 66-67 B body rear.

The current 275 tires actually look small on the car with plenty of clearance everywhere.
I have a set of 325/50-15 drag radials that I did a quick size up with and I'm reasonably sure they would fit no problem but I'm not sure I want to use them and take chance getting caught in then rain with them.

[73chalngr]

My bad I read the chart incorrectly. Thanks for the responses.

[71cudaddict]

67 b body rear in challenger

[GoodysGotaCuda]

I installed a 1967 B body 8 3/4 rear end under my wife's 1971 R/T Challenger using Dr. Diff's offset hanger kit.

How's the ride with those Monroe shocks?


Sent from my iPhone using Tapatalk

[GrandpaKevin]

Not too bad for an economy shock on an E-body, the car previously had air shock so any shock was an improvement.
I've never tried the high dollar shocks so I can't say how much better or worse they are.
The shocks are in more of a vertical position with the B body rear end, I'm not sure if that helps or hurts the ride quality.

The leaf springs are ESPO's +1.5

[RUNCHARGER]

The best thing about the Monroes is that they look stock. They dampen okay but I had one quit working in less than 1 year.