what are my axel ratios? - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 07-23-2009, 02:28 PM Thread Starter
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what are my axel ratios?

Ok ive been wondering what my ratios are for a long time im just not sure how to identify them. 1986 w/7.3 and 35'' muds. Heres me numbers from the front axle, i couldnt find the rear axle tag.

P308 41 41582
and then there is 141 which is up side down.
when i go to the gas station i can drive in third at about 45-50 at 2200-2300RPMs or shift to fourth and be about 1400-1600RPMs. any help will be very appreciated! thanks, jacob
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post #2 of 14 Old 07-23-2009, 02:39 PM
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souinds like you have 4.10 gears. I cant really get anyhting from that axle tag,

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post #3 of 14 Old 07-23-2009, 02:42 PM
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Quote:
Originally Posted by cc.DieselRacer View Post
Ok ive been wondering what my ratios are for a long time im just not sure how to identify them. 1986 w/7.3 and 35'' muds. Heres me numbers from the front axle, i couldnt find the rear axle tag.

P308 41 41582
and then there is 141 which is up side down.
when i go to the gas station i can drive in third at about 45-50 at 2200-2300RPMs or shift to fourth and be about 1400-1600RPMs. any help will be very appreciated! thanks, jacob
Maybe 3.08s?

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post #4 of 14 Old 07-23-2009, 02:50 PM Thread Starter
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I was thinking that the 308 was it but wasnt sure. where at on the rear axle are the numbers i can go look again and maybe it can be more usefull.
thanks again, jacob
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post #5 of 14 Old 07-23-2009, 02:56 PM
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They'd be on a tag on the pumpkin...

Billy

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post #6 of 14 Old 07-23-2009, 03:20 PM
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thought 3.08 would be a bit high actually.

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post #7 of 14 Old 07-23-2009, 03:41 PM
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whats your rpm @ 70 mph?

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post #8 of 14 Old 07-23-2009, 04:42 PM Thread Starter
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sorry for the wait. the fastest ive gone in this pickup is about 60 and i wasnt paying any attention to the rpms. and plus i just got this pickup in feb and been doing random stuff to make it reliable, the motor is kinda tired but i can burn the tires all the way through first and second!
i have one beautiful looking rear axle now, the whole thing is spotless and i cant find a single number! right now the rig is torn to peices since its getting painted so going for a drive is out of the question.

I did find some more numbers on the front tho, these are facing towards the cab unlike the ones i previously posted. The numbers are (upside down) 294 (right side up)B i doubt this helps but its all i have. thanks

Last edited by cc.DieselRacer; 07-23-2009 at 04:46 PM. Reason: f'ed up
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post #9 of 14 Old 07-23-2009, 04:50 PM
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If it is not limited slip....Take and jack up ONE side of the rear axles. Put a chalk mark on the driveshaft and the rear tire that is off the ground. Turn the driveshaft until the rear tire makes exactly 2 revolutions. How many times the driveshaft went around is your gear ratio. Obviously you won't be able to get 3.08 or 4.10 exactly, but if it is just under 4 then it is 3.73 if it is just over 4 then 4.10, etc.

If it is limited slip then just jack it up and do the same thing, but only do it for one rotation of both the rear tires. Same thing applies.

Make sure to chalk the wheels since it will need to be in neutral.

The other option is to take off the cover and count the teeth on the ring gear and pinion gear and then do the math. Divide the ring gear teeth by the pinion gear teeth. That would be your ratio.

-Aaron

Edit: Sometimes you can use the axle code on the door sticker too. Just google for the chart for that. I don't know a specific website.

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post #10 of 14 Old 07-23-2009, 05:11 PM
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Give this a look...

What gears do I have

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