3.73 vs 4.30
#17
08-26-2016, 11:56 AM
#18
08-26-2016, 12:32 PM
Keep in mind the cost of new u-bolts too. Never reuse those 
Other than that, that's what I would consider doing myself, if I was going to do it.
In my case, it's 4x4, but yeah, I would certainly consider replacing the entire unit, bolting up the old brakes/spindles/bearings to the replacement and calling it a day.
Me being me, however, I'd probably open it up to make sure it's good to go.
Other than that, that's what I would consider doing myself, if I was going to do it.
In my case, it's 4x4, but yeah, I would certainly consider replacing the entire unit, bolting up the old brakes/spindles/bearings to the replacement and calling it a day.
Me being me, however, I'd probably open it up to make sure it's good to go.
#19
08-26-2016, 01:19 PM
That's what I did on my EX, bought a set of complete axles with 4.88 gears already installed. I paid $1200 for those and the front has new ball joints and tie rod ends and all four brake assemblies had newer pads and rotors. Swapping out the entire housing is also faster than doing a regear/rebuild, and like you said your 3.73 assembly will be worth something to someone.
And to echo what Art said, get new U bolts.
#20
08-26-2016, 01:36 PM
I need to sell a high mileage but mechanically sound(shocks brakes radiator water pump engine rebuild) 1986 MR2 to fund the EX upgrades..... I need to find someone who knows the vacuum lines. It has major leak so it misses, but it's not gaskets, it's in the hoses somewhere. I am calling a potential buyer this afternoon....so we'll see.
#21
09-03-2016, 02:58 PM
#22
09-04-2016, 12:46 PM
#23
01-15-2017, 03:00 PM
Rpm calculator
So ... if you want to know what RPM you're going to be at with a different gearing (and the SAME SIZE TIRES), do this:
Go out on the highway, see what RPMs you are running at now at any given speed. Write it down. Let's say, you see 2200RPM at 70MPH and you're running 3.73s
Take the RPM, divide by the CURRENT gearing, then multiply the result with the NEW gearing.
So if you're running at 2200RPM at 70 with 3.73's, you'll see 2536 with 4.30's.
Im50fast, stock van tires are smaller diameter than the Superduty. So you'll see higher RPMs for any given speed, with the same gearing. Also, remember the Torqshift might have a different overdrive ratio than the 4R100, so that'll also affect the RPMs.
Go out on the highway, see what RPMs you are running at now at any given speed. Write it down. Let's say, you see 2200RPM at 70MPH and you're running 3.73s
Take the RPM, divide by the CURRENT gearing, then multiply the result with the NEW gearing.
So if you're running at 2200RPM at 70 with 3.73's, you'll see 2536 with 4.30's.
Im50fast, stock van tires are smaller diameter than the Superduty. So you'll see higher RPMs for any given speed, with the same gearing. Also, remember the Torqshift might have a different overdrive ratio than the 4R100, so that'll also affect the RPMs.
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