Differential ratios
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Senior User
Joined: Mar 2018
Posts: 248
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From: Lindsey Suffolk England
Yes, that's exactly right. I do not know if it is the axle originally fitted when built new. The stamping in the circle you mentioned in your first post....does that apply to the 41 and the 44 axles ?. I will get under tomorrow morning with a torch (sorry...flashlight), and see if I can read the casting text. Either way, I can see why people tell me it is far more cost effective to do an axle swap rather than change diff ratios. BUT I will still get some prices for crown,pinion and carrier. The downfall will be the cost of shipping and taxes to UK. I will let you know what I find tomorrow.
, been under the truck doing some investigating. Here is a photo of the text in the area circled in the earlier post. Above that their are some numbers 18419. Also I marked one wheel with tape and also marked the propshaft UJ and diff casing. Spinning one rear wheel one complete turn makes the propshaft turn just shy of two complete turns. What does that tell us ?.
Cargo Master
Joined: Feb 2006
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From: Lititz PA
With one wheel on the ground and the other jacked up, rotate the wheel 2 revolutions. Count the number of revolutions at the driveshaft. You’ll get about 4 1/4 turns on the driveshaft with a 4.27 rear. I have a 4.27 in mine right now, I do a little drag racing. Dennis
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Senior User
Joined: Mar 2018
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From: Lindsey Suffolk England
With one wheel on the ground and the other jacked up, rotate the wheel 2 revolutions. Count the number of revolutions at the driveshaft. You’ll get about 4 1/4 turns on the driveshaft with a 4.27 rear. I have a 4.27 in mine right now, I do a little drag racing. Dennis
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Senior User
Joined: Mar 2018
Posts: 248
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From: Lindsey Suffolk England
Same result with one wheel on ground. Two revolutions of road wheel turns propshaft just shy of four revolutions. So as Blue Oval Rage stated earlier, I guess that makes it a 3.92:1 ratio diff.
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