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Username Post: ADDING A 9" DIFF TO THE 55        (Topic#360878)
Shoebox 
Contributor
Posts: 359
Shoebox
Loc: Wisconsin
Reg: 09-28-03
05-09-20 06:39 AM - Post#2793261    

Fearing that my 454 could break the original posi in my 55, I am going with a 9"diff from John's Industries. My question for anyone else who has done this is does the position of the pinion yoke allow use of the original driveshaft? Or must it be lengthened/shortened? Any info most appreciated!

Shoebox
>> My Cool 55 <<

55 2dr Sedan- 454 4spd, R&P steering, 4 whl disks
32 Roadster- Nailhead 401, Tremec 5 sp


 


Shoebox 
Contributor
Posts: 359
Shoebox
Loc: Wisconsin
Reg: 09-28-03
05-10-20 10:56 AM - Post#2793397    
    In response to Shoebox

Anyone,........... please

Shoebox
>> My Cool 55 <<

55 2dr Sedan- 454 4spd, R&P steering, 4 whl disks
32 Roadster- Nailhead 401, Tremec 5 sp


 
Rick_L 
Member #409
Posts: 27733
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
05-10-20 12:04 PM - Post#2793398    
    In response to Shoebox

There are at least 3 pinion yoke lengths for each of the 3 different popular u-joint sizes for a 9".
Each would require a different driveshaft length.

That said, if you get the correct one, you can re-use your driveshaft. Unfortunately I don't know which length is correct.



 
Shoebox 
Contributor
Posts: 359
Shoebox
Loc: Wisconsin
Reg: 09-28-03
05-10-20 01:54 PM - Post#2793406    
    In response to Rick_L

Rick, thanks for weighing in on this.

Shoebox
>> My Cool 55 <<

55 2dr Sedan- 454 4spd, R&P steering, 4 whl disks
32 Roadster- Nailhead 401, Tremec 5 sp


 
55_FEVER 
Contributor
Posts: 221
55_FEVER
Loc: Abbotsford, B.C. Canada
Reg: 01-23-02
05-12-20 10:58 AM - Post#2793596    
    In response to Shoebox

Even if you can find a yoke that you can use your stock driveshaft with, I think a stronger shaft would be advisable with your bbc and 4 spd. I have a 454 and 700R4 and opted for a larger, stronger driveshaft based on advice from others. It wasn't cheap, but at least my driveshaft is no longer the weak link.



 
Shoebox 
Contributor
Posts: 359
Shoebox
Loc: Wisconsin
Reg: 09-28-03
05-14-20 12:30 PM - Post#2793790    
    In response to 55_FEVER

Hey 55,
I agree, I have a heavy duty shaft from Inland Empire. And you're right it wasn't cheap.

Shoebox
>> My Cool 55 <<

55 2dr Sedan- 454 4spd, R&P steering, 4 whl disks
32 Roadster- Nailhead 401, Tremec 5 sp


 


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