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Re: Highway speed [Re: LONGBOX55] #834793 Tue Mar 13 2012 04:03 AM
Joined: Dec 2001
Posts: 14,720
Achipmunk Offline
Extreme Gabster
Well, I don't know where it came from but a fellow bolter in Mi. sent me a pumpkin that is 3.90.... .he says it came out of a 56 or 57 pickup. I do not know but I did look at the ring gears ect when I put a new pinion seal in it.

....I guess I've been told wrong but I've always "heard" there were 3.90's in a lot of the pickups and that it was the later years like the 60's that had even a higher gear???

I'm not claiming or dis-claiming anything here. Just adding to the confusion!!!


1937 Chevy Pickup
1952 Chevy Panel
Pictures in my Photobucket
1950 Chevy Coupe

52 Chevy Panel

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile
Re: Highway speed [Re: Achipmunk] #834801 Tue Mar 13 2012 04:18 AM
Joined: May 2006
Posts: 8,490
L
LONGBOX55 Offline
Master Gabster
1/2 tons from '54-'62 had a 3.90 gear as standard equipment.


Bill Burmeister
Re: Highway speed [Re: LONGBOX55] #835390 Thu Mar 15 2012 03:59 AM
Joined: Nov 2008
Posts: 549
A
aggie jon Offline
Shop Shark
I would add for the "doubting thomas" that unless you have a need for a higher gearset, or the rear end is coming from a known, unmolested truck, take the rear cover off, count the teeth on the ring and pinion, just to make sure. I know I bought mine w/o opening it up, and got lucky. My advice if I were ever buying another one, I'd take the 5 minutes to pop the cover off and count the gears.

Re: Highway speed [Re: aggie jon] #835428 Thu Mar 15 2012 08:13 AM
Joined: Apr 2002
Posts: 1,574
G
GMCpanel Offline
Shop Shark
As I stated above, they should be marked on the edge of the ring gear. Or, if the transmission is out or it's in neutral, just rotate one tire and count the driveshaft revolutions.


Get a REAL truck, get a GMC! www.oldgmctrucks.com
1954 GMC De Luxe COE
Re: Highway speed [Re: GMCpanel] #835443 Thu Mar 15 2012 12:25 PM
Joined: Mar 2008
Posts: 1,956
W
Whitedog Offline
Shop Shark
Aggie Jon- on a 58, there is no cover to take off. You would have to pull the entire center section.


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
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Re: Highway speed [Re: Whitedog] #835479 Thu Mar 15 2012 03:09 PM
Joined: Nov 2008
Posts: 549
A
aggie jon Offline
Shop Shark
10-4.

Re: Highway speed [Re: Whitedog] #835484 Thu Mar 15 2012 04:05 PM
Joined: Mar 2004
Posts: 877
G
Ghostrider Offline
Shop Shark
Originally Posted by Whitedog
Aggie Jon- on a 58, there is no cover to take off. You would have to pull the entire center section.



Are you talking about an Eaton HO72/HO52?
I've never seen one that didn't have a removable rear cover.

Re: Highway speed [Re: Whitedog] #835517 Thu Mar 15 2012 05:38 PM
Joined: Mar 2004
Posts: 877
G
Ghostrider Offline
Shop Shark
Interesting. I've pulled several center sections from these axles clear up to '72 and pulled the rear cover off every one of them to confirm the gear ratio.

Re: Highway speed [Re: Ghostrider] #840759 Tue Apr 03 2012 01:52 AM
Joined: Mar 2012
Posts: 1
4
48truck Offline
New Guy
New here,
Was just looking at the talk, I have a 48 3804 9 ft., live in southern Ca. and just had the rear redone out of a 78 3500, that the shop shortened and got some new axels made to fit the wheel base. Not sure of the blah blah to 1 ratio but I can travel at freeway speeds. The 235 with dual YF carbs gets me along just great.

Last edited by 48truck; Wed Apr 04 2012 09:11 PM.
Re: Highway speed [Re: 48truck] #840771 Tue Apr 03 2012 02:35 AM
Joined: Dec 2003
Posts: 1,141
K
kb3csw Offline
Shop Shark
Had a 48 1 ton it would go along at 55 with 18" tires. The noise didn't bother me at the time. No idea what the rpm was.

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