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| | | | Joined: Jul 2011 Posts: 74 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2011 Posts: 74 |
I have a 1948 chev panel truck and have put in a gear vendor overdrive. it work great but I think that the 456 rear end is being pushed to hard and thought that I could drop in a 411 ring and pinion. Will that help or not. I believe that it is a 456 and without taking the back off the rear end can I turn the drive shaft and mark the wheel to know what I have for sure and if so how.
Thanks for your help
| | | | | Joined: Dec 2001 Posts: 1,248 'Bolter | | 'Bolter Joined: Dec 2001 Posts: 1,248 | 3/4 tons were usually either 4.57 or 5.14 to one. Why do you think it is running to hard??
John | | | | | Joined: Jul 2008 Posts: 1,262 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 1,262 | can I turn the drive shaft and mark the wheel to know what (gear ratio) I have for sure and if so how? Follow this procedure: To check rear end ratio jack up one tire if you have an open diff, or both tires if you have a working posi or locking differential. With the tranny in neutral (block the front tires first) rotate the jacked up tire one full revolution for posi's and lockers and 2 full revolutions for open diffs. Carefully count the number of full revolutions the driveshaft makes. This is your gear ratio. In other words, if the drive shaft turns 3 ¾ turns, you have a 3.73 gear ratio. Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading. Hope that helps!  John | | |
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