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Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 08-17-2010
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A little spooked...

Alright got some things that got me spooked recently with the truck. I just regeared to 4.10 gears. I know for a fact the front is a 4.10 because there was a sticker on it from the factory saying it was, but I found the reciept to when I bought the axles at the junkyard and it says that rear is a 3.73 gear ratio. I don't have the tag on the axle to find out if it is either a 3.73 or 4.10 so the only test I could do is put it in 4wd and see what happen, I figured something's got to break since they "could" be different, but I got it up to 60 in 4wd and nothing happened. It felt like it was in 4wd. Would it just break instantly or would it slowly wear down the T-case and Transmission? The rpm's are at 2500 at 65. From what I can remember they were at 2000 at 65 with 3.73s. Maybe the guy just made a mistake when typing.

pic of the gears if it helps:
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And the other thing is My Tranny has been acting weird all summer. When I'm on the highway going down hill at 65 at 2500rpm it's supposed to go down to idle when you let off the gas and let it cruise down but instead it stay's at the 2500 rpm and instead of the truck speeding up down hill it slows down which makes no sense to me. I've taken it to a shop for it but they didn't notice anything wrong with it. Is this just normal or is something wrong?
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Old 08-17-2010
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The tranny thing is normal. Its just in lock up at that speed so it responds and acts like a manual.

And for checking the ratio you could count the teeth. Someone should know on here how many teeth you have for a 4.10 or 3.73
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Old 08-31-2010
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divide the number of teeth on the ring gear by the number of teeth on the pinion gear.
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Old 08-31-2010
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is it open? if so then spin one of the axle shafts around 2 times and count how many times the flange where the drive shaft bolts to spins (pinion gear)....should be either 3 and about 3/4 times or a little more that 4....if it is L/S the only spin the axle shaft 1 time and count the turns on the pinion gear....
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Old 08-31-2010
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Its open. I'm starting to think its a 4.10. I went wheeling last week and used 4wd quite a bit and didn't have a problem with it. It's got fresh fluid in it and I really don't want to have to buy more. I thought that mismatching gears would NOT work if you used 4wd, it would just break, So I figured since I've used 4wd alot and nothing has broke it should be matching. Maybe not, idk.
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Old 08-31-2010
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yeah dude all you have to do is just jack the truck up while its in neutral and see how many spins of the yoke it takes to get the tire to spin around one full time.

Last edited by korey89; 08-31-2010 at 10:44 PM. Reason: kaynt speel
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Old 08-31-2010
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+1 for wut Korey said.

I don't get how people can be educated in 4-wheelin' and not know how to test wut gear ratio they have. pathetic!.....
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Old 08-31-2010
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engine braking is only normal in man 1 on a 5r trans, sounds like the one way clutch in the trans could be sticking or something, if it isnt slipping id just run with it
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Old 08-31-2010
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Quote:
Originally Posted by korey89 View Post
yeah dude all you have to do is just jack the truck up while its in neutral and see how many spins of the yoke it takes to get the tire to spin around one full time.
Thanks Korey. I'll try this over the weekend
Quote:
Originally Posted by Dangerranger01 View Post
+1 for wut Korey said.

I don't get how people can be educated in 4-wheelin' and not know how to test wut gear ratio they have. pathetic!.....
hey now, why so harsh lol. I'm still learning, now I know.

Quote:
Originally Posted by Toreador4x4 View Post
engine braking is only normal in man 1 on a 5r trans, sounds like the one way clutch in the trans could be sticking or something, if it isnt slipping id just run with it
Thanks Justin. Yeah its not slipping so I'll just wait and see. Really hope I can get it through the winter. I said the same last summer but no thing has broke yet
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Old 09-02-2010
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either the one way clutch or the converter is not working properly, find a 3.0 4r55 or 5r55 depending on what you have, bring it to me to rebuild
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Old 09-02-2010
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Quote:
Originally Posted by korey89 View Post
yeah dude all you have to do is just jack the truck up while its in neutral and see how many spins of the yoke it takes to get the tire to spin around one full time.
x3. If there wasn't a tag on the axle, before I even left the yard I would've done the spin check. I did on my new axle even though it was gonna get geared anyway.


A little more than 4 rotations of the shaft to 1 of the wheel = 4.10

A little less, 3.73.
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Old 09-02-2010
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Quote:
Originally Posted by korey89 View Post
yeah dude all you have to do is just jack the truck up while its in neutral and see how many spins of the yoke it takes to get the tire to spin around one full time.
does this still work the same with larger then factory tires?
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Old 09-03-2010
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Yeah....
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Old 09-03-2010
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Quote:
Originally Posted by Dangerranger01 View Post
+1 for wut Korey said.

I don't get how people can be educated in 4-wheelin' and not know how to test wut gear ratio they have. pathetic!.....

Why the **** do i care about my gear ratio(more specifically how to figure it out, cause i know my ratio)? It doesn't help me offroad at all buddy.
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Old 09-25-2010
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Quote:
Originally Posted by Toreador4x4 View Post
either the one way clutch or the converter is not working properly, find a 3.0 4r55 or 5r55 depending on what you have, bring it to me to rebuild
I have the 4.0 would those tranny's be the same for that? How much would you charge for parts and labor?

Quote:
Originally Posted by Fx4wannabe01 View Post
x3. If there wasn't a tag on the axle, before I even left the yard I would've done the spin check. I did on my new axle even though it was gonna get geared anyway.


A little more than 4 rotations of the shaft to 1 of the wheel = 4.10

A little less, 3.73.
Yeah it had a tag I just didn't put it back on the axle when putting the diff cover back on....Dumb move, I know. I still have yet to do the spin check, Hopefully I'll be be able to do it some time this week. Thanks again guys.
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Old 09-25-2010
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Just quoted 03fx4 or whatever his name is on here, for a complete rebuild with a shift kit and heavy duty converter $1350 + tax
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Old 09-25-2010
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If I lived farther north I'd probably have you do it, but I know a guy locally that'll do it for about the same price and he lives minutes down the road, thanks though!
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