Rearend swap

[Moparman78]

I just acquired a few parts for a challenger most importantly a 340, for my engine swap. but i was wondering if the rearend (8 3/4 3.55 suregrip) will fit under my 78 Aspen. I just don't think the stock rear will handle a 340.

 

[Erics5th]

Here are some good instructions here: http://www.dippy.org/forum2/index.php?PHPSESSID=c3179fd748524ac4e229c77d2bdeaaf2&topic=84.0

I have an 8 3/4 in my 5th also. My friend I bought it from did the swap using these instructions. I kept the iso clamps, but you can use B body shock mounts if you want.

 

[Moparman78]

Sweet ill check it out thanks.

 

[80 Lebaron Coupe]

I may be wrong, but I think the E-Body rearend is too wide.
The B-Body rearend is the ideal choice of most for this swap.

 

[76CinnamonRT]

E Body is too wide. I wouldn't do it. That article is a good one.

68-70 B Body is ideal

-Kenny

 

[Erics5th]

Kenny is correct. Mine came out of a '69 Belvedere.

 

[80 Lebaron Coupe]

And mine came out of a 66 Coronet.
I will be using that same 3.55 gear ratio
behind my 340 with a 4 speed.

 

[jasperjacko]

I think a 8.25 will live fine behind a 340 street car (no slicks). They used them in trucks and vans pulling all kinds of stuff over the years.

 

[efriedrich]

I plan on putting the 8.25 vs the 8.75 discussion to the test this spring. I plan like Jasperjacko to have some fun at the track this coming year with my 8.25 3.21 dif with 300 plus hp, if and when it breaks I will make a change. I'm curious how much it will take. I obviously understand the 8.75 is stronger but I am curious how strong the 8.25 is.

 

[bremereric]

I plan on putting the 8.25 vs the 8.75 discussion to the test this spring. I plan like Jasperjacko to have some fun at the track this coming year with my 8.25 3.21 dif with 300 plus hp, if and when it breaks I will make a change. I'm curious how much it will take. I obviously understand the 8.75 is stronger but I am curious how strong the 8.25 is.

Eric I think it's a half an inch stronger, that's all.

 

[Badasspen]

Was an 8.75 4.10 suregrip an option for the f body? Curious because I have one complete with iso-clamps.

 

[Moparman78]

Ive got a b body rear from '64 but it's open with high gears

 

[Shorty Thompson]

I'd been told that the 8.25 will hold up to 450hp . How much is your 340 making ?

 

[BHA43]

Was an 8.75 4.10 suregrip an option for the f body? Curious because I have one complete with iso-clamps.

No 8:75 avail in F's If you have a 8:75 with iso it is likely from a 72 RR & will be wider than the 66-70 B body which fits the F.

 

[BHA43]

I'd been told that the 8.25 will hold up to 450hp . How much is your 340 making ?

The early Hemi cars (64/67) came with 8:75 before the Dana was avail.

 

[Moparman78]

I'd been told that the 8.25 will hold up to 450hp . How much is your 340 making ?

It's not going to be anything major. 400hp tops just wanna nice street car

 

[Shorty Thompson]

Then a 8.25 should work for you .

 

[Badasspen]

No 8:75 avail in F's If you have a 8:75 with ist is likely from a 72 RR & will be wider than the 66-70 B body which fits the F.[/QU

I know where to get a Dana out if a 70 satellite. So you're telling me it will fit?

 

[Shorty Thompson]

No 8:75 avail in F's If you have a 8:75 with ist is likely from a 72 RR & will be wider than the 66-70 B body which fits the F.[/QU
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I know where to get a Dana out if a 70 satellite. So you're telling me it will fit? [quote ]

Yes !

 

[80 Lebaron Coupe]

I put a Dana 60 out of a 68 GTX in a 78 Volare premeire.
and a 340/727 out of a Dart Sport.
This car was beautiful. Black with maroon int.
Bucket seats and counsel. that was my first experience
with a F-Body. Thats way before these sites were around
I found out by measuring and just welded the F-Body
ISO spring pads in place of the B-Body ones.
It worked well. A bit over kill for a stock 340,
but it was all I had at the time. and the 7 1/4 was toast.