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Username Post: Turn Key Diffs ?        (Topic#350443)
19554drbelair 
Forum Newbie
Posts: 50
19554drbelair
Loc: ON, Canada
Reg: 05-06-09
04-04-18 01:06 AM - Post#2729868    

I am looking at diving into a 74 Nova, I know that i can deal with the steering, brakes, engine etc. However when it comes to rebuilding the differential I have no clue. Do you guys know of any Complete diffs that you can order? The bolt in, add oil, turn key type ? It seems that most sites i have checked out ask you so much stuff that i can not get my head wrapped around it. Any help would be appreciated.



 




raycow 
Honored Member
Posts: 27353
raycow
Loc: San Francisco, CA
Reg: 11-26-02
04-04-18 08:21 AM - Post#2729900    
    In response to 19554drbelair

There are several outfits which build complete rear axles. Names like Moser, Currie, and Strange come first to mind, and there are probably others. If you have already contacted any of these and found them unhelpful, we might be able to give you some pointers if you could post here about the specific issues which were problematic.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
19554drbelair 
Forum Newbie
Posts: 50
19554drbelair
Loc: ON, Canada
Reg: 05-06-09
04-09-18 11:06 AM - Post#2730467    
    In response to raycow

Ray,

I think I am starting to get a handle on it after reading up about it. Although I am still a little confused about what the best ratio I would want. My style would be more that of a drag car. Higher rpm at lower speeds. Or more so take off power vs high cruising speeds. Do lower gear ratios actually have a higher number or is it fit for that. So 4.10 would be for better cruising and 3.73 would be for take off power, or do I have that backwards?



 
raycow 
Honored Member
Posts: 27353
raycow
Loc: San Francisco, CA
Reg: 11-26-02
04-09-18 11:36 PM - Post#2730530    
    In response to 19554drbelair

The higher numbers favor drag strip performance, so 3.73 would be better for cruising than 4.10. In fact, even the 3.73 might cause the engine to turn faster than you are comfortable with for highway driving. Without an OD transmission, most builders run a rear end in the low 3.xx range for street use.

If your emphasis is more on racing than street driving, then you might want to consider the 4.10 over the 3.73.

Have you checked the ratio in the rear end you have now? If not, it might be helpful to give it a count before you order a replacement rear.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Junkyardwarrior 
Contributor
Posts: 299

Loc: Yuma AZ
Reg: 02-25-15
04-18-18 01:51 PM - Post#2731440    
    In response to raycow

The 73-74 range nova's didn't have a whole lot of good rear choices from the factory, but there are quite a few Camaro rears and what not that will drop right in with minor modification if any. Might check the local scrap yards. If you're going to cruise without O/D, I would suggest a 3.08 or lower. The 3.73 is a medium area. I'm running a TH400 with 4.11's in my 73 and I turn about 3k in 3rd at 45 MPH sitting on a 26ish inch tall tire (235/60 R15). Just some things to consider.

"8 cylinders of why the f&@% not" - me


 




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