[Spridgets] More highway speed for a bugeye?

Sun May 10 15:36:18 MDT 2015

Are you sure?  

If the differential includes the ring and pinion but without the  
assembly/pumpkin then the pinion is a loose item because it's not fixed to  anything. 
 The ring or crownwheel is bolted to the differential but the  pinion is 
bolted into the pumpkin.

In a message dated 10/05/2015 16:06:50 GMT Daylight Time, derf247 at gmail.com 
 writes:

What we call the differential includes the ring and pinion.   The assembly, 
or pumpkin, is what he needs.  

On Sun, May 10, 2015 at 10:03 AM, <_WeslakeMonza1330 at aol.com_ 
(mailto:WeslakeMonza1330 at aol.com) > wrote:

Not exactly!

The differential doesn't change the gearing of the rear axle.  The  gearing 
of the rear axle is down to the ring and pinion or what we call over  in 
the UK, the crownwheel and pinion.

You want the ring and pinion fitted to the differential component and  all 
fitted together in the differential as a single large component - what I  
believe you call the pumpkin.  Probably your best bet is to simply buy  a good 
3.9 from Alan Fisher who is having a clear out.

Changing the axle ratio doesn't improve the performance of the car it  
simply changes the gearing. To reduce the engine rpm for any given speed in  4th 
gear you need to replace the 4.22 diff with the 3.9 diff or fit a 5  speed 
gearbox with either.

If your car is struggling to maintain 70 mph you need to understand if  
this is because the engine is really revving out (might have a diff lower  than 
a 4.2 like a 4.5 or lower from a Morris Minor or whatever) or if the  
engine is simply not running well enough to get up the required revs.

Regards

Daniel

PS: there are books with this stuff in...

In a message dated 10/05/2015 15:51:41 GMT Daylight Time, 
_spridgets at autox.team.net_ (mailto:spridgets at autox.team.net)  writes:

You only need the Differential which goes inside the pumpkin and rear  
axle.  As Derf said you want one that has 10/39 on the top of the  differential 
case but check yours first to see which you have now!   There were at least 
3 available. Early cars were 4.22 to 1,  then  there is 3.9 to 1 and the 
shorter 4.22 to 1.  The 4.22 is great for  autocross -  the taller geared 3.77 
for highway use.  As was  noted, the taller gears are getting hard to find 
and usually demand a  suitable hunk of cash.

If you find a 3.9 or 3.77 that's inside a rear axle case and the  seller 
won't part it out, buy the whole thing.  You'll need help  picking it up!!   
DAMHIK....

Cheers!
Jim

On Sun, May 10, 2015 at 9:29 AM, derf via  Spridgets 
<_spridgets at autox.team.net_ (mailto:spridgets at autox.team.net) > wrote:

I know the basics but will have to defer on the  details.  This is where 
Frank would chime in and sort it all  out.  There are others who know and 
share, but none like him.   Really miss that guy.  

On Sun, May 10, 2015 at 9:22 AM, ryan.kubanoff---  via Spridgets 
<_spridgets at autox.team.net_ (mailto:spridgets at autox.team.net) > wrote:

So if I go to carlisle import show next weekend what should I be  on the 
lookout for or what should I avoid?  looking for rear  pumpkin or whole rear 
axle? how can I tell if possible whats good and  whats crap?
Thanks 
Ryan

____________________________________
From:  "derf" <_derf247 at gmail.com_ (mailto:derf247 at gmail.com) >
To: "Ryan Kubanoff"  <_ryan.kubanoff at comcast.net_ 
(mailto:ryan.kubanoff at comcast.net) >
Cc:  "spridgets" <_spridgets at autox.team.net_ 
(mailto:spridgets at autox.team.net) >
Sent: Sunday,  May 10, 2015 8:39:29 AM
Subject: Re: [Spridgets] More  highway speed for a bugeye?  

You might also look into stronger axle shafts while  you're doing rear end 
work.  Any Spridget diff chunk should fit  in your rear housing.  Just drop 
the drive shaft, pop the axles  out, and swap the chunk.  Diff ratios are 
stamped on top of the  chunk.  "10/39" is 3.9. IIRC "9/38" is what you would 
have on  your 4.22.

On Sun, May 10, 2015 at 5:59 AM,  ryan.kubanoff--- via Spridgets 
<_spridgets at autox.team.net_ (mailto:spridgets at autox.team.net) > wrote:

So i have a 74 midget with a 1275, rib case, and a stock rear  that will do 
70+ on a highway no problem.  Last year I bought a  60 bugeye that was 
modiifed by the previous owner to have a 998 cc  motor, rib case  and a stock 
bugeye rear.  It has more  trouble with highway speeds.  Could I swap out the 
stock bugeye  rear for a late model midgets?  Would that improve  
performance?
Thanks
Ryan

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